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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)

Number of vulnerabilities in this bulletin: 3

Creation date: 19/08/2009

Revision date: 20/08/2009

IMPACTED PRODUCTS

– Cisco IOS XR

DESCRIPTION OF THE VULNERABILITY

Three denials of service were announced in Cisco IOS XR.

When Cisco IOS XR receives a prefix with an invalid attribute, it
closes the session over which the update was received. [grav:2/4;
BID-36063, CSCtb42995, CVE-2009-2055]

When the BGP process sends an update message containing numerous
ASN (Autonomous System Number), it stops. [grav:1/4; BID-36092,
CSCtb05382, CVE-2009-1154]

When the BGP process prepends numerous ASN (Autonomous System
Number) in a path, it stops. [grav:1/4; BID-36093, CSCtb12726,
CVE-2009-2056]

A peer can therefore send malicious BGP messages in order to
generate a denial of service on Cisco IOS XR.

CHARACTERISTICS

Identifiers: 110825, BID-36063, BID-36092, BID-36093,
cisco-sa-20090818-bgp, CSCtb05382, CSCtb12726, CSCtb18562,
CSCtb42995, CVE-2009-1154, CVE-2009-2055, CVE-2009-2056,
VIGILANCE-VUL-8956

http://vigilance.fr/vulnerability/Cisco-IOS-XR-denials-of-service-via-BGP-8956