Rule:
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Sid:
1250

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Summary:
Attack on Cisco router/switch web interface

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Impact:
Unauthorized administrative access to Cisco devices running vulnerable versions of IOS (router/switch operating system)

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Detailed Information:
Cisco routers and switches running vulnerable IOS versions can be attacked simply by typing in a URL, giving the attacker administrative access to the device.  The device must be running the web configuration interface, a web server that enables a user to configure the device via a web browser.

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Affected Systems:
Cisco routers and switches running affected versions of IOS and whose web management interface is enabled. See http://www.securityfocus.com/bid/2936 

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Attack Scenarios:
Attacker identifies http server running on Cisco switch or router.  Attacker then makes an http connection with the particular URL required to gain administrative control.

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Ease of Attack:
Simple. Web request, no exploit software needed.

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False Positives:
Legitimate access to the configuration manager will generate an event.

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False Negatives:
None known.

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Corrective Action:
Upgrade IOS to the latest non-affected version.

Apply the appropriate vendor supplied Patches

Disable the web configuration interface.

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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
Snort documentation contributed by James Affeld <jamesaffeld@yahoo.com>

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Additional References:

Bugtraq:
http://www.securityfocus.com/bid/2936

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