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Cisco IOS VTP Denial of Service Vulnerability Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA23892  
Release Date: 2007-01-30

Critical:
Less critical
Impact: DoS
Where: From local network
Solution Status: Unpatched

OS:Cisco IOS 12.x
Cisco IOS R12.x


This advisory is currently marked as unpatched!
- Companies can be alerted when a patch is released!


Description:
David Barroso Berrueta and Alfredo Andres Omella have reported a vulnerability in Cisco IOS, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an unspecified error when handling certain malformed VLAN Trunking Protocol (VTP) packets. This can be exploited to cause a device to reload by sending a specially crafted VTP packet.

Successful exploitation requires knowledge of the VTP domain name and the port that is configured for trunking.

The vulnerability is reported in the following devices:
* Cisco 2900XL Series Switches
* Cisco 2950 Series Switches
* Cisco 2955 Series Switches
* Cisco 3500XL Series Switches
* Cisco 3550 Series Switches
* Cisco 3570 Series Switches

Solution:
The vendor recommends allowing only trusted devices to connect to ports configured for ISL or 802.1q trunking.

Provided and/or discovered by:
Alfredo Andres Omella and David Barroso Berrueta, S21SEC

Original Advisory:
Cisco Advisory:
http://www.cisco.com/en/US/products/p...ecurity_response09186a00807d1a81.html

21SEC Advisory:
http://www.s21sec.com/es/avisos/s21sec-034-en.txt



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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