A quagga security update has been released for Debian GNU/Linux

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Debian Security Advisory DSA-2497-1 security@debian.org
http://www.debian.org/security/ Florian Weimer
June 20, 2012 http://www.debian.org/security/faq
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Package : quagga
Vulnerability : denial of service
Problem type : remote
Debian-specific: no
CVE ID : CVE-2012-1820
Debian Bug : 676510

It was discovered that Quagga, a routing daemon, contains a
vulnerability in processing the ORF capability in BGP OPEN messages.
A malformed OPEN message from a previously configured BGP peer could
cause bgpd to crash, causing a denial of service.

For the stable distribution (squeeze), this problem has been fixed in
version 0.99.20.1-0+squeeze3.

For the testing distribution (wheezy) and the unstable distribution
(sid), this problem has been fixed in version 0.99.21-3.

We recommend that you upgrade your quagga packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/