quagga - security update

Two vulnerabilities were discovered in quagga, a BGP/OSPF/RIP routing
daemon.

• CVE-2016-4036
  TamĂĄs NĂŠmeth discovered that sensitive configuration files in
  /etc/quagga were world-readable despite containing sensitive
  information.
• CVE-2016-4049
  Evgeny Uskov discovered that a bgpd instance handling many peers
  could be crashed by a malicious user when requesting a route dump.

For the stable distribution (jessie), these problems have been fixed in
version 0.99.23.1-1+deb8u2.

We recommend that you upgrade your quagga packages.