Vulnerability identifier: #VU44161

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2012-0255

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Quagga
Server applications / Other server solutions

Vendor: quagga.net

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The BGP implementation in bgpd in Quagga before 0.99.20.1 does not properly use message buffers for OPEN messages, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a message associated with a malformed Four-octet AS Number Capability (aka AS4 capability).

Mitigation
Install update from vendor's website.

Vulnerable software versions

Quagga: 0.95 - 0.99.19

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External links
http://lists.fedoraproject.org/pipermail/package-announce/2012-April/078794.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-April/078910.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-April/078926.html
http://rhn.redhat.com/errata/RHSA-2012-1259.html
http://secunia.com/advisories/48949
http://www.debian.org/security/2012/dsa-2459
http://www.kb.cert.org/vuls/id/551715

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.