The new crypto map remains disabled until a peer and a valid access list are configured. The following example illustrates the route to 192.168.20.0/24, which be seen via the tunnel interface. The CPU of the IKEv2 headend was then constantly at 100 percent. The prefix for IP address assigned to the loopback interface on Router2 is reachable via the protected tunnel. Technical Search. Router1 will retrieve the certificate from the HTTP server and validate the AUTH payload by using the public key obtained from the retrieved certificate. No state is allocated to any IKE sessions as all IKE_SA_INIT replies are resent. The following example illustrates the relevant configuration on Router2. To illustrate this behavior, the IKEv2 headend was amended to allow 1000 in negotiation SAs. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.ciscopress.com/u.aspx. This was enabled, using the value of 0, so all received IKE_SA_INIT requests will be returned with the cookie notification payload. KEv2 proposal is a collection of transforms used in the negotiation of Internet Key Exchange (IKE) security associations (SAs) as part of the IKE_SA_INIT exchange. Generally, users may not opt-out of these communications, though they can deactivate their account information. This is achieved by the use of the certificate map that matches the locally used certificate and is attached to the trustpoint. Figure 7-3 illustrates the operation of the HTTP URL lookup feature. IKE stands for Internet Key exchange, it is the version 2 of the IKE and it has been created to provide a better solution than IKEv1 in setting up security association (SA) in IPSEC. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account. This is due to the fact that no state is allocated to any of the received IKE_SA_INIT requests. While this mitigation has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Although each scenario uses only two routers, the configuration can scale as required if needed. As the certificate is cached, if the IKE session drops and is re-established, the certificate will not be required to be obtained via HTTP as it is already cached. Also note the NOTIFY payload which indicates the HTTP URL method is supported. The following example illustrates traffic being sent over the IPsec Security Association. R1 (config-ikev2-profile)#lifetime 3600 R1 (config-ikev2-profile)#dpd 10 5 on-demand And this completes the IKEv2 configurtaion. The following example illustrates the configuration used on Router1. This action will recover any consumed IP addresses from the IP pool and prevent the vulnerability from being exploited until an upgrade can be performed. The Branch Office VPN configuration page opens. This setup consists of an IOS device acting as a VPN headend. Activate the crypto map by applying the interface: Verify that Host1 (behind the Firebox) and Host2 (behind the Cisco ISR) can ping each other. 09:45 PM. As the certificate obtained via the HTTL URL method is processed prior to authentication, an intruder could redirect the gateway to a large file containing garbage, or a URI that will slowly introduce a file, a little at a time, causing a DoS on the gateway. The Gateway Endpoint Settings dialog box opens. All rights reserved. Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Pearson does not rent or sell personal information in exchange for any payment of money. Asymmetric pre-shared-keys are used with each device having a unique local and remote key. The mandatory IKEv2 profile is configured that uses the certificate map created earlier. The tunnel interface is created with the relevant source interface configured and with the destination address of Router2. Some of the initial forty requests time out, and the state for these are removed before any new requests are processed and state allocated. The following example illustrates the impact that enabling the cookie challenge mechanism has. This is used within the IKEv2 profile to anchor the peers presented certificate. This profile will only match peer certificates, which contain the string cisco.com within the subject name. How well does your IT System support your Business success? 02-21-2020 We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes. The following scenario highlights the use of the cookie challenge and the maximum in negotiation SA features, and the benefits that each brings. All Product Documentation This is protected by the IPsec profile created above. A certificate map is created that will match certificates containing a subject name of cisco.com. This vulnerability occurs because the code does not release the allocated IP address under certain failure conditions. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law. This integration guide describes how to configure a Branch Office VPN tunnel between a WatchGuard Firebox and a Cisco Integrated Services Router (ISR). The algorithms used to secure the IKE session as described in Table 7-1 can be seen. Once cookie challenge is enabled, the CPU drops from 100 to 0 percent. Note that the automatic granting of certificates is used here for ease of configuration and should not occur in a production environment where un-authenticated access to the CA can occur. Each design will use a simple deployment of two routers with the focus on the configuration of IKEv2. Here is how you can configure yourCisco ISR routerto use real SSL certificates instead of self-signed. For instance, if our service is temporarily suspended for maintenance we might send users an email. The CPU then drops to zero percent for approximately fifteen seconds and once again rises back to near full CPU at ninety percent. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. The following example illustrates IKEv2 debugs taken from Router1. All keyrings use the same peer IP address and use the password ' cisco.' On R1, profile2 is used for the VPN connection. To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides the Cisco Software Checker to identify any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (First Fixed). This saves numerous HTTP requests to occur if the peer is required to re-authenticate. In the adjacent text box, type the pre-shared key. In this situation, the responder will reply with the cookie notification payload. A short time later, Router1 opens a TCP socket with 192.168.1.100, when the certificate is obtained. On rare occasions it is necessary to send out a strictly service related announcement. Or, even better,scroll down to the very bottomof this page tosign upforourNewsletter. Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information. It can be enabled by default. In most cases this will be a maintenance upgrade to software that was previously purchased. To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including: For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. An attacker could exploit this vulnerability by trying to connect to the device with a non-AnyConnect client. The transport network is using IPv6, and the overlay network is using IPv4. Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. An Internet Key Exchange Version 2 (IKEv2) proposal is a collection of transforms used in the negotiation of Internet Key Exchange (IKE) security associations (SAs) as part of the IKE_SA_INIT exchange. Rather than using the default IKEv2 proposal, the default IKEv2 proposal is disabled, and a new IKEv2 proposal created containing the IKEv2 algorithms defined in Table 7-1. Figure 7-4 illustrates the topology used in the tunnel interface configuration. Router1#show crypto ikev2 sa detailed IPv4 Crypto IKEv2 SA IPv6 Crypto IKEv2 SA This profile is for DMVPN. Sign up to receive the latest news and offers from IT Networks. You must specify the same pre-shared key that you specified in the BOVPN configuration on the Firebox. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Although the IKEv2 generator is sending a constant stream of these, the IKEv2 headend will only process forty at any given time (although this value is configurable). Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn. 8-6 A VPN encryption protocol that manages request and response operations is known as IKEv2 (Internet Key Exchange version 2). The IKEv2 AutoReconnect feature is not enabled by default. Click Save. IKEv2 IPsec Virtual Private Networks: Understanding and Deploying IKEv2, IPsec VPNs, and FlexVPN in Cisco IOS, $51.99 This command will match the defined certificate map and override the SIA to contain the configured URL. This vulnerability affects Cisco devices if they are running a vulnerable release of Cisco IOS or IOS XE Software and have the IKEv2 AutoReconnect feature enabled. The certificate that is obtained via HTTP is cached locally. Router (config)#crypto ikev2 profile profile-ph1-wg An IKEv2 profile must have: A local and a remote authentication method A match identity, match certificate, or match any statement Router (config-ikev2-profile)#match identity remote address 203.0.113.2 255.255.255.255 Router (config-ikev2-profile)#authentication remote pre-share In the adjacent text box, type the IPaddress of your Cisco ISR WAN connection. Router1 has been set up as a certificate authority; from this CA, a certificate is obtained for both Router1 and Router2. The transform types used in the negotiation are as follows: Encryption algorithm Integrity algorithm Pseudo-Random Function (PRF) algorithm Diffie-Hellman (DH) group The transform types used in the negotiation are as follows: Encryption algorithm Integrity algorithm Pseudo-Random Function (PRF) algorithm Subscribe to Cisco Security Notifications, show running-config | include ^ reconnect, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ikev2-ebFrwMPr. An IPsec transform set is created, which uses AES-GCM-256. The IKEv2 generator is pre-configured with an IKEv2 proposal that will be accepted by the IKEv2 headend and sends approximately 12 spoofed packets every second. . The IPsec Security Association is verified where the default IPsec transform set is used, which is created using Encapsulation Security Payload with AES-CBC-256 for encryption and SHA1-HMAC for integrity. This vulnerability was found during the resolution of a Cisco TAC support case. The following example shows output for a device that is configured with the IKEv2 AutoReconnect feature enabled: Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. The sudden initial spike in CPU (40 to 60 seconds) is due to the device processing the first forty spoofed IKE_SA_INIT requests, these are processed and replies sent. Cisco has released free software updates that address the vulnerability described in this advisory. Router(config)#crypto ikev2 proposal wg-proposal. Router2 will sign the AUTH payload with its private key. Pearson may disclose personal information, as follows: This web site contains links to other sites. The authentication is set to pre-shared-key with the locally configured keyring defined previously. 03:58 AM The Cisco CG-OS router employs IKEv2 to authenticate to the destination router by using either a pre-shared key (PSK) or by using RSA signatures with a Public Key Infrastructure (PKI). All traffic intended for this network will be sent via the tunnel and encrypted by the corresponding IPsec Security Association. Keep the default values for Phase 2 settings. Continued use of the site after the effective date of a posted revision evidences acceptance. An IKEv2 profile must have: A local and a remote authentication method ; A match identity, match certificate, or match any statement. More secure and support for EAP New here? For more information about the Cisco ISR VPN configuration and supported IKE ciphers, see the Cisco ISR 1921 Configuration Guides. The critical component to ensure that this client does not send its certificate but instead sends the HTTP URL is the match certificate command. The Primary Interface IP Address is the primary IPaddress you configured on the selected external interface. We may revise this Privacy Notice through an updated posting. The scenario looks to use digital signatures to authenticate both peers. An Internet Key Exchange Version 2 (IKEv2) proposal is a collection of transforms used in the negotiation of Internet Key Exchange (IKE) security associations (SAs) as part of the IKE_SA_INIT exchange. The authentication method is set to ECDSA and the PKI trustpoint used which was configured earlier. Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising. The local IKEv2 identity is set to the IPv6 address configured on E0/0. This will match any certificates, which contain a subject name of cisco.com. This was to illustrate the load when generating a large number Diffie-Hellman calculations and the software crypto engine was used. When an IKEv2 device acting as a responder receives a number of half-open IKE_SA_INIT requests, the cookie challenge mechanism can be deployed. Figure 7-2 illustrates the physical IP addressing and the setup of the tunnel interface. Various other trademarks are held by their respective owners. Profile2 is the second profile in the configuration, which uses the second keyring in the configuration. By default, 200 certificates will be cached. The PKI trustpoint is defined; it has been authenticated, and the local device enrolled. This can be done on the Account page. IKEv2 must be configured on the source and destination router (peers) and both routers must employ the same authentication method. We only send them once a month and you can always unsubscribe. The tunnel source and destination being the IPv6 addresses configured on the physical E0/0 interfaces. The following example illustrates verification that the IKEv2 SA established. Disabling or blocking certain cookies may limit the functionality of this site. IKEv2 call admission control (CAC) limits the maximum number of IKEv2 SAs that can be established. IKEv2 Deployments. WatchGuard and the WatchGuard logo are registered trademarks or trademarks of WatchGuard Technologies in the United States and other countries. The value configured can be between 0 and 1000, which denotes the maximum number of in-negotiation IKE SAs before the cookie challenge is engaged. This advisory is part of the September 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. WatchGuard provides integration instructions to help our customers configure WatchGuard products to work with products created by other organizations. As always please feel free to reach out if you need assistance with this. The IKEv2 headend receives the IKE_SA_INIT, checks that the transforms are valid, allocates state and returns its IKE_SA_INIT response. The responder will then allocate state to the IKE session. The administrator can restore the reconnect timeout command to the configuration after the upgrade. If a device is under a Denial-of-Service (DoS) attack where spoofed IKE_SA_INIT are sent with the purpose of overloading the CPU, the device can be configured to activate the cookie-challenge mechanism. A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The mandatory IKEv2 profile is configured which uses the certificate map created earlier. If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (Combined First Fixed). A loopback interface is used that will allow traffic to be sourced from and destined to as it transverses the VPN. The local loopback interface is configured, which will allow testing over the IPsec Security Association. (Save 20%). The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Rather than the more common RSA certificates, Elliptic Curve (EC) certificates are used that provide the ability to authenticate both parties, using the Elliptic Curve Digital Signature Algorithm (ECDSA). Do this profile would work? Figure 7-1 PSK Authentication with Smart Defaults Topology. Establishing and managing the SA (Security Association) characteristic within an authentication suite (typically IPSec because IKEv2 is primarily dependent on and built into it) ensures online safety.. "/>. If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. Keep the default settings for all other options. Enhanced interior gateway routing protocol (EIGRP) is used to establish a peer relationship over the tunnel interface and distribute the loopback prefix. A match identity, match certificate, or match any statement. . Each design will use a simple deployment of two routers with the focus on the configuration of IKEv2. This site currently does not respond to Do Not Track signals. To determine whether the IKEv2 AutoReconnect feature is enabled, use the show running-config | include ^ reconnect command that is available under the crypto IKEv2 profile. The creation of the IPsec Security Association can be seen in the following example. The configuration in this example is intended to be simple, with the main focus on the IKEv2 configuration. This is achieved by matching the local subject name (which is not case sensitive) of router2. The following example illustrates the IKEv2 SA being verified. However, this will incur an additional two-packet exchange to any IKE negotiation which might not be optimal in some situations. This privacy statement applies solely to information collected by this web site. To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency. This module describes the Internet Key Exchange Version 2 (IKEv2) protocol. Cisco ISR and WatchGuard Firebox Branch Office VPN Integration Guide . > An attacker could . The IOS headend is configured with a default gateway, which is where all replies to any received IKE_SA_INIT messages will be sent and then discarded. The IKEv2 proposal must be one of these two options: Router(config-ikev2-proposal)#encryption aes-cbc-256, Router(config-ikev2-proposal)#integrity sha256, Router(config)#crypto ikev2 policy wg-policy. The authentication method is set to RSA signatures, and the trustpoint configured earlier is used. An example of where to access a server can be included in the SIA with a uniform resource identifier (URI). The SIA is amended to contain the URL that the peer will use for the HTTP URL lookup. In adjacent text box, type the primary IP address of the External Firebox interface. We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form. On Cisco IOS routers, I created crypto ikev2 keyring myownkeys + crypto ikev2 profile default. Traffic is sent via the tunnel interface, from the locally configured loopback interface to the loopback on Router2. Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication. We only send them once a month and you can always unsubscribe. The responder does not allocate any state to the session. This router have 2 trust points from different PKI servers and i want to use them both in case one of PKI server die, permanently Find answers to your questions by entering keywords or phrases in the Search bar above. The trustpoint is configured using manual enrollment, with the local and CA certificate. The E0/0 interface is used as the tunnel source. In addition to ECDSA for authentication, Cisco Next Generation Encryption (NGE) algorithms secure the IKEv2 and IPsec session, as shown in Table 7-1. The tunnel interface has a unique IP address, and the destination is configured as E0/0 on Router1. Finding Feature Information Prerequisites for Configuring Internet Key Exchange Version 2 The hardware and software used in this guide include: This diagram shows the topology for a BOVPN connection between a Firebox and a Cisco ISR. Pearson may send or direct marketing communications to users, provided that. As per the IKEv2 RFC, Cisco IOS requires the obtained certificate to be in distinguished encoding rules (DER) encoding. Static routes are used to send traffic down the freshly created tunnel interface. Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html. Occasionally, we may sponsor a contest or drawing. The following example shows the command used to achieve this. An IKEv2 policy is created, which encompasses the IKEv2 proposal created above. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. Cisco has confirmed that this vulnerability does not affect the following Cisco products: There are no workarounds that address this vulnerability. By using smart defaults, a VPN is created between two peers using minimal configuration: only the IKEv2 profile and corresponding IKEv2 keyring are required. If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@ciscopress.com. This advisory is available at the following link:https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ikev2-ebFrwMPr. Home This vulnerability occurs because the code does not release the allocated IP address under certain failure conditions. The certificate authority function is enabled. Note that this traffic has been protected by the IPsec Security Association, as indicated by the increasing encaps and decaps counters. The following example illustrates verification on Router1 that the certificate was obtained by way of HTTP. For more information about BOVPN virtual interface configuration on the Firebox, see BOVPN Virtual Interfaces . We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. The IKEv2 policy must have at least one complete proposal attached. The authentication method of RSA can be seen. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. These certificates are used to authenticate the IKEv2 SA. Customers can use the Cisco Software Checker to search advisories in the following ways: After initiating a search, customers can customize the search to include all Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. Command Purpose. Once forty IKE SAs are in negotiation, no more IKE_SA_INIT requests will be processed. Supplemental privacy statement for California residents, Pre-shared-key Authentication with Smart Defaults. A certificate map is created that will match certificates containing a subject name of router1.cisco.com. This chapter introduces a number of designs where IKEv2 is used. Step 16 crypto ip sec profile profile-name Configures an IPSec profile for attachment to the virtual tunnel interface. IKEv2 is the supporting protocol for IP Security Protocol (IPsec) and is used for performing mutual authentication and establishing and maintaining security associations (SAs). IKEv2 IPsec Site-to-Site VPN configuration on Cisco ASA 8.4 (x) Though the crypto IKEv2 proposal command looks similar to the IKEv1 crypto isakmp policy command, there are many differences in how IKEv2 negotiates. Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. Empty output indicates that the IKEv2 AutoReconnect feature is not enabled and the device is not affected by this vulnerability. However, the base concepts are the same with regards to the PKI. When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution. The subject information access (SIA) is an attribute within a certificate that defines some type of offered services. Router2 has a nearly similar configuration; the following example illustrates the unique configuration. Cisco Admin What is the IKEv2? A certificate map is created that will match certificates containing a subject name of router2.cisco.com. This was due to the amount of constant spoofed IKE_SA_INIT requests from the IKEv2 generator that overwhelmed the IKEv2 state machine. Because this reply is sent to an IP address that was spoofed by an attacker, this reply will be discarded, or dropped by the receiver. For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. To test the integration, from Fireware Web UI: Give Us Feedback If the initiator was legitimate, the response containing the cookie will reach the initiator who will then re-attempt the IKE_SA_INIT exchange, including the cookie notification payload, which is then verified by the responder. As you will see, the keyring order is critical. Figure 7-1 illustrates the topology. This is protected by the default IPsec profile which uses the default IKEv2 profile which was created earlier. Get Support In this chapter from IKEv2 IPsec Virtual Private Networks: Understanding and Deploying IKEv2, IPsec VPNs, and FlexVPN in Cisco IOS , authors Graham Bartlett and Amjad Inamdar introduce a number of designs where IKEv2 is used. On the Firebox, configure a Branch Office VPN connection: To configure the Cisco ISR, from the Cisco CLI: Router(config)#crypto ikev2 keyring wg-key, Router(config-ikev2-keyring-peer)#address 203.0.113.2, Router(config-ikev2-keyring-peer)#pre-shared-key 11111111. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services. With the consent of the individual (or their parent, if the individual is a minor), In response to a subpoena, court order or legal process, to the extent permitted or required by law, To protect the security and safety of individuals, data, assets and systems, consistent with applicable law, In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice, To investigate or address actual or suspected fraud or other illegal activities, To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract, To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice. Participation is optional. The following example illustrates the EIGRP neighbor relationship built over the tunnel interface. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites; develop new products and services; conduct educational research; and for other purposes specified in the survey. The authentication method is set to RSA signatures, and the trustpoint configured earlier is used. 2022 WatchGuard Technologies, Inc. All rights reserved. This site is not directed to children under the age of 13. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. This is used within the IKEv2 profile to anchor the peers presented certificate. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. Imagine a device created to send many IKE_SA_INIT requests to the headend from random spoofed source IP addresses. In our example, we configure a Cisco ASA . Define an RSA key of 2048bit length crypto key generate rsa label Synergy.Key modulus 2048 The configuration is intended to be as simple as possible, and the emphasis is focused on the IKEv2 configuration. The only way to recover the IP pool involves a device reload. Follow us onLinkedIn,FacebookorTwitterto be notified when we post new content. The certificate generated by the IOS CA is in Privacy Enhanced Mail (PEM) format. To include results for Medium SIR vulnerabilities, customers can use the Cisco Software Checker on Cisco.com and check the Medium check box in the drop-down list under Impact Rating when customizing a search. The default IPsec profile is disabled, which ensures that it is not used due to mis-configuration. Using a value for the maximum in negotiation SAs that is a little higher than what is observed in a known good state will allow this mechanism to engage should a DoS condition occur. The identity is set to DN, which will use the DN from the certificate. Router1 will then retrieve the certificate from the HTTP URL and verify that the presented AUTH payload was signed by the private key relating to the public key contained within the certificate. Cisco Defense Orchestrator . The tunnel interface is created with the relevant source interface configured, and the destination address of Router1. Because this is a combined mode cipher, no integrity algorithm is required. Additionally, perfect forward secrecy is enabled to ensure that a fresh Diffie-Hellman exchange is performed on rekey. Configure Cisco IOS Anyconnect IKEv2 VPN with Local accounts and SSL Certificates Kim Pham June 17, 2020 LinkedIn Configuring the Cisco Router Here is how you can configure your Cisco ISR router to use real SSL certificates instead of self-signed. The IKEv2 profile is the mandatory component and matches the remote IPv6 address configured on Router2. This will match any certificates which contain a subject name of cisco.com. Example Scenarios In the first scenario, R1 is the ISAKMP initiator. The following example illustrates the configuration that is used on Router1. Although each scenario uses only two routers, the configuration can scale as required if needed. This configuration is the simplest to set up. This response will be received by the router and then forwarded to the 192.168.1.1 destination where it will be discarded. 2022 Pearson Education, Cisco Press. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services. The physical interface used as the tunnel source. https://www.cisco.com/c/en/us/products/end-user-license-agreement.html, https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html, Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication, Choose the software and one or more releases, Upload a .txt file that includes a list of specific releases. However, I cannot remove the keyring because I have the following message : cannot remove as keyring is in use. The following example illustrates viewing the contents of the certificate cache. An IKEv2 profile is created, which uses the certificate map created earlier. Marketing preferences may be changed at any time. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. In this scenario, we will use RSA certificates to authenticate both peers. Please note that other Pearson websites and online products and services have their own separate privacy policies. Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing. Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Cisco Press products and services that can be purchased through this site. I can see in the running-config file all the commands previously entered. Keep all other Phase 1 settings as the default values. Router(config)#crypto ikev2 profile wg-profile. Dead-peer detection is enabled to ensure that the IKEv2 SA and corresponding IPsec Security Associations are torn down in a timely manner if IKE connectivity is lost. The drop in CPU processing was due to the CAC feature becoming active. Customers can also use the following form to determine whether a release is affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S: By default, the Cisco Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). The tunnel interface is configured with the default GRE mode, the traffic selectors can be seen indicating this by the use of IP protocol 47. Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. The relating PKI trustpoint for the IOS CA is: A trustpoint is used to enroll into the local CA. The following example illustrates the OpenSSL commands to manually convert a certificate from PEM to DER encoding, with the PEM encoded certificate in file 3.crt. The authentication is performed using pre-shared-key. The cookie challenge is a useful feature when an IKEv2 headend is under a DoS attack whereby source IP addresses are spoofed. This removes the inclusion of the certificate within the IKE exchange and uses the value defined in the SIA as the location for the peer to obtain the certificate. The next step will be IPsec configuration. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:https://www.cisco.com/c/en/us/products/end-user-license-agreement.html. This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. This is used within the IKEv2 profile to anchor the certificates presented by the peers. The information in this document is intended for end users of Cisco products. When using the HTTP URL lookup feature, the router that retrieves the HTTP URL should be protected from malicious intent by restricting HTTP access to only the server storing the certificates. pki trustpoint TPOINT-1pki trustpoint TPOINT-2. This is then sent in replacement of the certificate in the IKE_AUTH exchange. As this is a site-to-site VPN with only two peers, the certificate map could have been more granular to include the peer DN. Transport mode is used. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. The following certificate map is used by the match statement within the trustpoint configuration to match the local certificate. Router(config-ikev2-profile)#match identity remote address 203.0.113.2 255.255.255.255 . Should a certificate hierarchy exist where there is a requirement to send a certificate chain with multiple URLs in multiple CERT payloads starting from ID cert url, subca1, subca2, until root CA; then each additional certificate can be included as a separate line within the trustpoint configuration as illustrated below. The following example illustrates the IKEv2 SA that is created. The physical interface used as the tunnel source uses IPv6. Users can always make an informed choice as to whether they should proceed with certain services offered by Cisco Press. IKEv2 Authentication The Cisco CG-OS router employs IKEv2 to authenticate to the destination router by using either a pre-shared key (PSK) or by using RSA signatures with a Public Key Infrastructure (PKI). Articles Cisco IOS crypto ikev2 profile - Cisco Community Start a conversation Cisco Community Technology and Support Security VPN Cisco IOS crypto ikev2 profile 532 0 0 Cisco IOS crypto ikev2 profile vivaadmin Beginner 10-03-2019 03:58 AM - edited 02-21-2020 09:45 PM Hello. THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. . The cryptographic algorithms used have been negotiated via the use of smart defaults. Router(config-crypto-map)#set peer 203.0.113.2, Router(config-crypto-map)#set pfs group14, Router(config-crypto-map)#set security-association lifetime seconds 3600, Router(config-crypto-map)#set transform-set wg-set, Router(config-crypto-map)#set ikev2-profile wg-profile, Router(config-crypto-map)#match address SITE1-SITE2-CACL, Router(config)#interface GigabitEthernet0/0. To illustrate the CAC in action, the architecture in Figure 7-5 was developed. To rectify this issue, the cookie-challenge is enabled by default. The default IKEv2 proposal is disabled, and a new IKEv2 proposal is created that contains the relevant cryptographic algorithms. Use these resources to familiarize yourself with the community: Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Keep all other Phase 1 settings as the default values. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions. Note the unique IP address and the tunnel destination of Router1. A static route is configured to send all traffic for the 192.168.20.0/24 network, which is the subnet protected by the peer, via the peer tunnel IP address. Give the Site-to-Site connection a connection profile name that is easily identifiable. We will identify the effective date of the revision in the posting. Why the IKEv2? Configure the Cisco ASA. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment. The IKEv2 SA is protected by the PRF and integrity algorithms using SHA512, encryption using AES-CBC-256, and Diffie-Hellman group 5, which are the most preferred algorithms within the IKEv2 default proposal. If the command returns output, the device is affected by this vulnerability. > CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. However, for Router2, we will not send the certificate within the IKE AUTH exchange, but will send a HTTP URL from Router2 to Router1 to inform it where to obtain the certificate. Router(config-ikev2-policy)#proposal wg-proposal, Router(config)#ip access-list extended SITE1-SITE2-CACL, Router(config-ext-nacl)#permit ip 10.0.1.0 0.0.0.255 192.168.13.0 0.0.0.255, Router(config)#crypto ipsec transform-set wg-set esp-aes 256 esp-sha256-hmac, Router(config)#crypto ikev2 profile wg-profile, Router(config-ikev2-profile)#match identity remote address 203.0.113.2 255.255.255.255, Router(config-ikev2-profile)#authentication local pre-share, Router(config-ikev2-profile)#authentication remote pre-share, Router(config-ikev2-profile)#keyring local wg-key, Router(config)#crypto map wg-map 10 ipsec-isakmp. Although the IKEv2 RFC states that the HASH and URL feature returns a URL with the SHA1 hash of the requested certificate, Cisco IOS allows for any URL to be used. The following example illustrates the CPU history when a constant stream of spoofed IKEv2 SA_INIT requests is sent from the IKEv2 generator. The default IPsec profile is used to protect this interface; this uses the default IKEv2 profile which was configured earlier. A vulnerability in the Internet Key Exchange Version 2 (IKEv2) support for the AutoReconnect feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to exhaust the free IP addresses from the assigned local pool. From the Version drop-down list, select IKEv2. I would like to receive exclusive offers and hear about products from Cisco Press and its family of brands. The following example illustrates the relevant configuration used on Router1. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources. For information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. This is required as the transport network is IPv6 and the overlay is IPv4. The transform types used in the negotiation are as follows: Encryption algorithm Integrity algorithm Pseudo-Random Function (PRF) algorithm To mitigate this vulnerability, an administrator can remove the reconnect timeout command that is available under the crypto IKEv2 profile and reload the device. A successful exploit could allow the attacker to exhaust the IP addresses from the assigned local pool, which prevents users from logging in and leads to a denial of service (DoS) condition. Define the keyring and specify your VPN pre-shared key: A local and a remote authentication method. This profile is for DMVPN. a transform-set is a set of protocols and algorithms specified to secure data in IPsec tunnel. Elliptic Curve Digital Signature Algorithm. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. The following physical interface is used as the tunnel source. I can unsubscribe at any time. The authentication is performed using pre-shared-key. The example might seem complex as this scenario uses IPv4 and IPv6; however, the main focus of interest is to illustrate the IKEv2 configuration and the simplicity of using smart defaults. Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. IPsec configuration Create a transform-set. The following example illustrates the configuration used on Router2. This will enable the responder to include the cookie notification payload in the response to the initiator. It can be seen that Router2 sends the IKE_AUTH exchange with the CERT payload containing the HASH and URL format. The tunnel interface is created with the relevant source interface configured and the destination address of Router1. There is no differentiation that the certificate was received via the HTTP URL method; the authentication is performed in the same manner as RSA authentication when certificates are sent in the IKE_AUTH exchange. A vulnerability in the Internet Key Exchange Version 2 (IKEv2) support for the AutoReconnect feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker to exhaust the free IP addresses from the assigned local pool. Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure. Mitigation can be achieved using controls, such as access-control-lists, control-plane policing, or control-plane protection. If you need more information or technical support about how to configure a third-party product, see the documentation and support resources for that product. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. We use this information to address the inquiry and respond to the question. Users can manage and block the use of cookies through their browser. CAC limits the number of simultaneous negotiations with the default being 40 in-negotiation SAs, although this value is configurable using the crypto ikev2 limit max-in-negotation-sa command. Participation is voluntary. California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. Customers Also Viewed These Support Documents. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. Please be aware that we are not responsible for the privacy practices of such other sites. 10-03-2019 While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com. The physical interface used to reach the HTTP server containing the certificates. The IKEv2 generator sends an IKE_SA_INIT request with a spoofed source IP address of 192.168.1.1 to 10.10.10.1. Because this is a combined mode cipher, no integrity algorithm is required. A new IPsec profile is created which uses the IKEv2 profile and IPsec transform-set created earlier. I have short and a bit odd question. The tunnel interface is created as tunnel mode GRE IPv6. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication. An IKEv2 keyring is created with a peer entry which matches the peers IPv6 address. The hardware used for the IKEv2 headend was purposely chosen as a low-powered device. Although not shown, the trustpoint uses a locally configured elliptic curve keypair. Because the default IKEv2 proposal is disabled, this then ensures that only the IKEv2 proposal named nge will be used and minimizes the chance of mis-configuration. Keep all other Phase 2 settings as the default values. There are no workarounds that address this vulnerability. - edited The configuration is similar to the ECDSA example earlier, but RSA certificates are used, which results in a different authentication method. The IKEv2 SA is protected by the PRF and integrity algorithms using SHA512, encryption using AES-CBC-256, and Diffie-Hellman group 5, which are the most preferred algorithms within the IKEv2 default proposal. Note that the shared secrets used in the example below are for illustrative purposes and, if used in a production environment, should contain sufficient entropy. This is a very minimal configuration which leaves little room for error. Cisco has released software updates that address this vulnerability. This is protected by the default IPsec profile that uses the default IKEv2 profile, which was created earlier. Such marketing is consistent with applicable law and Pearson's legal obligations. Traffic is sent from Router1 to Router2 via the tunnel interface. 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