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Vigil@nce: Cisco IOS, denial of service via BGP

August 2009 by Vigil@nce

A malicious peer can send BGP packets in order to force the router to restart.

Severity: 2/4

Consequences: denial of service of computer

Provenance: intranet client

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)

Number of vulnerabilities in this bulletin: 2

Creation date: 29/07/2009

IMPACTED PRODUCTS

- Cisco IOS

DESCRIPTION OF THE VULNERABILITY

The RFC 4893 extents the BGP protocol to support ASN (Autonomous System Number) on 4 bytes, instead of 2 bytes. When an IOS router supports ASN-4, a malicious peer can generate two vulnerabilities.

An attacker can send more than one thousand BGP Updates using ASN-2, to generate a denial of service. [grav:2/4; BID-35860, CSCsy86021]

An attacker can send a malformed BGP Update using ASN-2, to generate a denial of service. [grav:2/4; BID-35862, CSCta33973, CVE-2009-2049]

A malicious peer can therefore send BGP packets in order to force the router to restart.

CHARACTERISTICS

Identifiers: 110457, BID-35860, BID-35862, cisco-sa-20090729-bgp, CSCsy86021, CSCta33973, CVE-2009-2049, VIGILANCE-VUL-8901

http://vigilance.fr/vulnerability/C...




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