CVE-2009-2939

Published: 21 September 2009

The postfix.postinst script in the Debian GNU/Linux and Ubuntu postfix 2.5.5 package grants the postfix user write access to /var/spool/postfix/pid, which might allow local users to conduct symlink attacks that overwrite arbitrary files.

Status

Notes

per Weitse, the symlink attack should not be possible due to
defensive programming. A subverted postfix process running as 'postfix'
could replace the pid file, which master could then send signals to.

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2939
• http://www.openwall.com/lists/oss-security/2009/09/18/6
• https://usn.ubuntu.com/usn/usn-1113-1
• NVD
• Launchpad
• Debian