Advisory: Cisco IOS HTTP client DoS

October 18, 2011  |  Jaime Blasco

DESCRIPTION:

There is a problem with the HTTP client implementation on Cisco IOS. If an administrator loads an application service via these commands:

router#config

Configuring from terminal, memory, or network [terminal]?

Enter configuration commands, one per line.  End with CNTL/Z.

router(config)#application

router(config-app)#service name http://ip_address/

router(config-app-param)#end

and the HTTP server responds with a special crafted HTTP response, the device will crash.

AFFECTED VERSIONS:

The vulnerability has been detected in a wide branch of Cisco IOS.

VENDOR RESPONSE:

http://tools.cisco.com/security/center/viewAlert.x?alertId=24436

CREDITS:

Jaime Blasco, Alienvault Labs

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