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Cisco IOS / CatOS VLAN Trunking Protocol Vulnerability

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Release Date:  2008-11-06    Last Update:  2009-01-14    Views:  9,179

Secunia Advisory SA32573

Where:

From local network

Impact:

DoS

Solution Status:

Unpatched

CVE Reference(s):

Description


A vulnerability has been reported in Cisco IOS/CatOS, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an unspecified error in the handling of VLAN Trunking Protocol (VTP) packets. This can be exploited to crash an affected device by sending a specially crafted packet to a switch interface configured to operate as a trunk port.

Successful exploitation requires that "VTP Operating Mode" is set to "server" or "client".

The vulnerability is reported in Cisco IOS, CatOS, and Cisco IOS with Ethernet Switch Modules for Cisco 1800/2600/2800/3600/3700/3800 Series Routers.


Solution:
Apply configuration best practices to limit exposure to exploitation (please see the vendor advisory for details).

Provided and/or discovered by:
The vendor credits showrun.lee.

Original Advisory:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sr-20081105-vtp.shtml

showrun.lee:
http://sh0wrun.blogspot.com/2009/01/dos-code-for-cisco-vlan-trunking.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Cisco IOS / CatOS VLAN Trunking Protocol Vulnerability

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