Vulnerability identifier: #VU33865

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-2013-6051

CWE-ID: CWE-20

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_attr_unknown function in bgp_attr.c in Quagga 0.99.21 does not properly initialize the total variable, which allows remote attackers to cause a denial of service (bgpd crash) via a crafted BGP update.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Quagga: 0.99.21

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External links
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=730513
http://git.savannah.gnu.org/gitweb/?p=quagga.git;a=commitdiff;h=8794e8d229dc9fe29ea31424883433d4880ef408
http://www.debian.org/security/2013/dsa-2803

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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.