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TITLE:
Cisco IOS VTP Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA23892

VERIFY ADVISORY:
http://secunia.com/advisories/23892/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
Cisco IOS 12.x
http://secunia.com/product/182/
Cisco IOS R12.x
http://secunia.com/product/50/

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/products_security_response09186a00807d1a81.html

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

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About:
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