[Full-disclosure] Cisco Security Advisory: Cisco IOS Software Multicast Network Time Protocol Denial of Service Vulnerability

[Cisco Systems Product Security Incident Response Team <psirt@xxxxxxxxx>]

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Cisco IOS Software Multicast Network Time Protocol Denial of Service 
Vulnerability

Advisory ID: cisco-sa-20130925-ntp

Revision 1.0

For Public Release 2013 September 25 16:00  UTC (GMT)
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Summary
=======

A vulnerability in the implementation of the Network Time Protocol (NTP) 
feature in Cisco IOS Software could allow an unauthenticated, remote attacker 
to cause an affected device to reload, resulting in a denial of service (DoS) 
condition.

The vulnerability is due to the improper handling of multicast NTP packets that 
are sent to an affected device encapsulated in a Multicast Source Discovery 
Protocol (MSDP) Source-Active (SA) message from a configured MSDP peer. An 
attacker could exploit this vulnerability by sending multicast NTP packets to 
an affected device. Repeated exploitation could result in a sustained DoS 
condition.

Cisco has released free software updates that address this vulnerability. A 
workaround is available to mitigate this vulnerability.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ntp

Note: The September 25, 2013, Cisco IOS Software Security Advisory bundled 
publication includes eight Cisco Security Advisories. All advisories address 
vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security 
Advisory lists the Cisco IOS Software releases that correct the vulnerability 
or vulnerabilities detailed in the advisory as well as the Cisco IOS Software 
releases that correct all Cisco IOS Software vulnerabilities in the September 
2013 bundled publication.

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS 
Software Security Advisory Bundled Publication" at the following link: 
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep13.html

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