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Vigil@nce: Quagga, denial of service via ASN4

May 2009 by Vigil@nce

An attacker can use Autonomous System Number on 4 bytes in order to stop Quagga.

- Severity: 2/4
- Consequences: denial of service of service
- 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)
- Creation date: 05/05/2009

IMPACTED PRODUCTS

- Debian Linux
- Mandriva Corporate
- Quagga Routing Suite

DESCRIPTION OF THE VULNERABILITY

The RFC 4893 extents the BGP protocol to support ASN (Autonomous System Number) on 4 bytes, instead of 2 bytes.

The aspath_make_str_count() function of the bgpd/bgp_aspath.c file of Quagga converts an aspath structure to a string.

However, this function computes the size of the string with ASN on 2 bytes instead of 4 bytes. An assertion error thus occurs and stops Quagga.

An attacker can therefore use Autonomous System Number on 4 bytes in order to stop Quagga.

CHARACTERISTICS

- Identifiers: 526270, BID-34817, CVE-2009-1572, DSA 1787-1, MDVSA-2009:109, VIGILANCE-VUL-8691
- Url: http://vigilance.fr/vulnerability/Quagga-denial-of-service-via-ASN4-8691




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