CVE ID: CVE-2013-5548
Release Date: 2013 October 29 20:00 UTC (GMT)
Last Updated: 2013 October 30 19:26 UTC (GMT)
SummaryA vulnerability in the implementation of the Cisco IOS Software Internet Key Exchange version 2 (IKEv2) protocol may cause the anti-replay capabilities of IPsec to be disabled. This issue occurs only when using the Advanced Encryption Standard Galois/Counter Mode (AES-GCM) or the AES Galois Message Authentication Code (AES-GMAC) algorithms for Phase 2 IPsec Security Associations (SAs).
The vulnerability is due to improper coding of the logic required to enable or disable the anti-replay capabilities of an IPsec Phase 2 SA. An attacker could exploit this vulnerability by sending traffic that will traverse an IPsec tunnel. An exploit could allow the attacker to replay previously sent traffic as long as the application consuming the traffic does not implement its own sequence or anti-replay checks. Neither the confidentiality nor the authentication capabilities of IPsec are affected by this vulnerability.
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The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco Security Notices to inform customers of low- to mid-level severity security issues involving Cisco products.
Customers who wish to upgrade to a software version that includes fixes for these issues should contact their normal support channels. Free software updates will not be provided for issues that are disclosed through a Cisco Security Notice.
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