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

[Cisco Systems Product Security Incident Response Team <psirt () cisco com>]

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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
=======

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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