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 firstname.lastname@example.org.
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. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM
THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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 information in this document is intended for end users of Cisco products
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.