Ubuntu Security Notice 2007-1 – Martin Carpenter discovered that Apport set incorrect permissions on core dump files generated by setuid binaries. A local attacker could possibly use this issue to obtain privileged information…. Ubuntu Security Notice 2007-1 – Martin Carpenter discovered that Apport set incorrect permissions on core dump files generated by setuid binaries. A local attacker could possibly use this issue to obtain privileged information.

Read more http://packetstormsecurity.com/files/123762/USN-2007-1.txt