Cisco Security Advisory: Cisco IOS Software DHCP Denial of Service Vulnerability

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

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Cisco IOS Software DHCP Denial of Service Vulnerability

Advisory ID: cisco-sa-20130925-dhcp

Revision 1.0

For Public Release 2013 September 25 16:00  UTC (GMT)
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Summary
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A vulnerability in the DHCP implementation of Cisco IOS Software and Cisco IOS 
XE Software could allow an unauthenticated, remote attacker to cause a denial 
of service (DoS) condition.

The vulnerability occurs during the parsing of crafted DHCP packets. An 
attacker could exploit this vulnerability by sending crafted DHCP packets to an 
affected device that has the DHCP server or DHCP relay feature enabled. An 
exploit could allow the attacker to cause a reload of an affected device.

Cisco has released free software updates that address this vulnerability. There 
are no workarounds to this vulnerability. 

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

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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