[SANOG] Cisco Security Advisory: Cisco IOS Software Zone-Based Firewall and Content Filtering Vulnerability

[Cisco Systems Product Security Incident Response Team]

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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
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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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