Effective 2019 Sep 15, Cisco will no longer publish non-Cisco product alerts. Cisco will continue to publish Security Advisories to address third-party software vulnerabilities per the Cisco Security Vulnerability Policy.
Multivendor Vulnerability Alert
Cisco IOS Software and IOS XE Software Internet Key Exchange Version 2 Denial of Service Vulnerability
A vulnerability in the IKEv2 module of Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service condition.
The vulnerability is due to improper processing of malformed fields submitted as part of an IKE version 2 packet. An attacker could exploit this vulnerability by submitting malformed IKE packets to an affected device designed to trigger the issue. An exploit could allow the attacker to cause a denial of service condition.
Cisco confirmed the vulnerability in a security advisory and released software updates.
Indicators of Compromise
Customers are advised to use the Cisco IOS Software Checker tool to determine whether devices are running an affected release of Cisco IOS Software. The tool also provides information about releases that correct the vulnerabilities.
Cisco has published a list of affected Cisco IOS XE Software releases in the security advisory. The "Vendor Announcements" section of this alert contains a link to the advisory.
The vulnerability is due to improper processing of malformed IKEv2 packets by an affected device.
An unauthenticated, remote attacker could exploit this vulnerability by sending malformed IKEv2 packets to a targeted device. Processing the malformed IKEv2 packets could cause the device to reload, resulting in a DoS condition.
To exploit this vulnerability, an attacker may need to acquire additional information about the targeted device, such as whether IKEv1 or ISAKMP is enabled on the device. However, only IKEv2 packets could be used to trigger this vulnerability.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Administrators are advised to apply the appropriate updates.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at email@example.com.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.