Cisco IOS: Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.1583
         Cisco IOS Software Session Initiation Protocol Denial of
                           Service Vulnerability
                              7 November 2013

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        AusCERT Security Bulletin Summary
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Product:           Cisco IOS
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-5553  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131106-sip

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Cisco Security Advisory: Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerability

Advisory ID: cisco-sa-20131106-sip

Revision 1.0

For Public Release 2013 November 6 16:00  UTC (GMT)

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Summary
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A vulnerability exists in the Session Initiation Protocol (SIP) implementation in Cisco IOS Software that could allow an unauthenticated, remote attacker to cause a reload of an affected device or cause memory leaks that may result in system instabilities. To exploit this vulnerability, affected devices must be configured to process SIP messages. Limited Cisco IOS Software releases are affected.

Cisco has released free software updates that address this vulnerability.

There are no workarounds for devices that must run SIP; however, mitigations are available to limit exposure to the vulnerability.

This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131106-sip

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