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Cisco IOS Software Zone-Based Firewall and Content Filtering Vulnerability

Advisory ID: cisco-sa-20130925-cce

Revision 1.0

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

A vulnerability in the Zone-Based Firewall (ZBFW) component of Cisco IOS 
Software could allow an unauthenticated, remote attacker to cause an affected 
device to hang or reload.

The vulnerability is due to improper processing of specific HTTP packets when 
the device is configured for either Cisco IOS Content Filtering or HTTP 
application layer gateway (ALG) inspection. An attacker could exploit this 
vulnerability by sending specific HTTP packets through an affected device. An 
exploit could allow the attacker to cause an affected device to hang or reload.

Cisco has released free software updates that address this vulnerability. 

Workarounds that mitigate this vulnerability are not available.

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

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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