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Debian: Security update for Quagga

It has been discovered that the Quagga routing daemon contains two denial-of-service vulnerabilities in its BGP implementation. A crafted Extended Communities attribute triggers a null pointer dereference which causes the BGP daemon to crash. The crafted attributes are not propagated by the Internet core, so only explicitly configured direct peers are able to exploit this vulnerability in typical configurations. The BGP daemon resets BGP sessions when it encounters malformed AS_PATHLIMIT attributes, introducing a distributed BGP session reset vulnerability which disrupts packet forwarding. Such malformed attributes are propagated by the Internet core, and exploitation of this vulnerability is not restricted to directly configured BGP peers. Updated packages are available from security.debian.org.

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Hash: SHA1

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Debian Security Advisory DSA-2197-1 security@debian.org
http://www.debian.org/security/ Florian Weimer
March 21, 2011 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-2010-1674 CVE-2010-1675

It has been discovered that the Quagga routing daemon contains two
denial-of-service vulnerabilities in its BGP implementation:

CVE-2010-1674
A crafted Extended Communities attribute triggers a null
pointer dereference which causes the BGP daemon to crash.
The crafted attributes are not propagated by the Internet
core, so only explicitly configured direct peers are able
to exploit this vulnerability in typical configurations.

CVE-2010-1675
The BGP daemon resets BGP sessions when it encounters
malformed AS_PATHLIMIT attributes, introducing a distributed
BGP session reset vulnerability which disrupts packet
forwarding. Such malformed attributes are propagated by the
Internet core, and exploitation of this vulnerability is not
restricted to directly configured BGP peers.

This security update removes AS_PATHLIMIT processing from the BGP
implementation, preserving the configuration statements for backwards
compatibility. (Standardization of this BGP extension was abandoned
long ago.)

For the oldstable distribution (lenny), these problems have been fixed
in version 0.99.10-1lenny5.

For the stable distribution (squeeze), these problems have been fixed
in version 0.99.17-2+squeeze2.

For the testing distribution (wheezy) and the unstable distribution
(sid), these problems will fixed soon.

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/

Mailing list: debian-security-announce@lists.debian.org
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