Rechercher
Contactez-nous Suivez-nous sur Twitter En francais English Language
 

Freely subscribe to our NEWSLETTER

Newsletter FR

Newsletter EN

Vulnérabilités

Unsubscribe

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


See previous articles

    

See next articles


Your podcast Here

New, you can have your Podcast here. Contact us for more information ask:
Marc Brami
Phone: +33 1 40 92 05 55
Mail: ipsimp@free.fr

All new podcasts