quagga - several

Riku Hietamaki, Tuomo Untinen and Jukka Taimisto discovered several
vulnerabilities in Quagga, an Internet routing daemon:

• CVE-2011-3323
  A stack-based buffer overflow while decoding Link State Update
  packets with a malformed Inter Area Prefix LSA can cause the
  ospf6d process to crash or (potentially) execute arbitrary
  code.
• CVE-2011-3324
  The ospf6d process can crash while processing a Database
  Description packet with a crafted Link-State-Advertisement.
• CVE-2011-3325
  The ospfd process can crash while processing a crafted Hello
  packet.
• CVE-2011-3326
  The ospfd process crashes while processing
  Link-State-Advertisements of a type not known to Quagga.
• CVE-2011-3327
  A heap-based buffer overflow while processing BGP UPDATE
  messages containing an Extended Communities path attribute
  can cause the bgpd process to crash or (potentially) execute
  arbitrary code.

The OSPF-related vulnerabilities require that potential attackers send
packets to a vulnerable Quagga router; the packets are not distributed
over OSPF. In contrast, the BGP UPDATE messages could be propagated
by some routers.

For the oldstable distribution (lenny), these problems have been fixed
in version 0.99.10-1lenny6.

For the stable distribution (squeeze), these problems have been fixed
in version 0.99.17-2+squeeze3.

For the testing distribution (wheezy) and the unstable distribution
(sid), these problems have been fixed in version 0.99.19-1.

We recommend that you upgrade your quagga packages.