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Vigil@nce: Cisco IOS, CatOS, denial of service via VTP

November 2008 by Vigil@nce

SYNTHESIS

An attacker can send a malicious VTP packet on the local network in order to restart the system.

Gravity: 1/4

Consequences: denial of service of computer

Provenance: LAN

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 06/11/2008

IMPACTED PRODUCTS

- Cisco Catalyst
- Cisco IOS
- Cisco Router

DESCRIPTION

The VTP (VLAN Trunking Protocol) protocol is used to manage the VLAN configuration. A password can be configured to authenticate packets.

When some versions of the IOS/CatOS receive a malicious VTP packet, a denial of service occurs. This packet:

- can be sent to a VTP client or server
- has to be received on a port of the trunk
- does not require an authentication

Technical details are unknown.

An attacker can therefore send a malicious VTP packet on the local network in order to restart the system.

CHARACTERISTICS

Identifiers: 108203, BID-32120, cisco-sr-20081105-vtp, CSCsv05934, CSCsv11741, VIGILANCE-VUL-8224

http://vigilance.fr/vulnerability/8224




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