Cisco Security Advisory
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AV:N/AC:M/Au:N/C:N/I:P/A:N/E:F/RL:OF/RC:C
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A vulnerability in the AES-GCM code of Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to modify the contents of an encrypted IPSec or IKEv2 packet, and for those modifications not to be detected.
The vulnerability is due to an error on the firmware of the Cavium Networks cryptographic module. Due to this vulnerability, the integrity check value (ICV) is not verified. An attacker could exploit this vulnerability by intercepting encrypted packets in transit and modifying their contents. Such packets would be decrypted by the ASA and then forwarded to their destination, without the modification being detected.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker must be able to intercept encrypted packets in transit, making exploitation more difficult in environments that restrict network access from untrusted sources.
This vulnerability does not allow an attacker to decrypt IPSec or IKEv2 packets in transit, nor obtain information about the session keys being used for the security association. In addition, this vulnerability does not impact SSL/TLS traffic originating from or destined to the ASA.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Cisco has released bug ID CSCuu66218 for registered users, which contains additional details and an up-to-date list of affected product versions.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
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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 tac@cisco.com.
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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.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2015-Jun-16
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