USN-636-1: Postfix vulnerability

Releases

• Ubuntu 8.04
• Ubuntu 7.10
• Ubuntu 7.04
• Ubuntu 6.06

Packages

• postfix -

Details

Sebastian Krahmer discovered that Postfix was not correctly handling
mailbox ownership when dealing with Linux's implementation of hardlinking
to symlinks. In certain mail spool configurations, a local attacker
could exploit this to append data to arbitrary files as the root user.
The default Ubuntu configuration was not vulnerable.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 8.04

• postfix - 2.5.1-2ubuntu1.1

Ubuntu 7.10

• postfix - 2.4.5-3ubuntu1.2

Ubuntu 7.04

• postfix - 2.3.8-2ubuntu0.2

Ubuntu 6.06

• postfix - 2.2.10-1ubuntu0.2

In general, a standard system upgrade is sufficient to effect the
necessary changes.

References

• CVE-2008-2936