Debian: DSA-2154-1 Critical: Exim4 Privilege Escalation Issue

The detailed list of changes is described in the NEWS.Debian file in
the packages. The relevant sections are also reproduced below.

In addition to that, missing error handling for the setuid/setgid
system calls allowed the Debian-exim user to cause root to append
log data to arbitrary files (CVE-2011-0017).

For the stable distribution (lenny), these problems have been fixed in
version 4.69-9+lenny3.

For the testing distribution (squeeze) and the unstable distribution
(sid), these problem have been fixed in version 4.72-4.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Excerpt from the NEWS.Debian file from the packages exim4-daemon-light
and exim4-daemon-heavy:

Exim versions up to and including 4.72 are vulnerable to
CVE-2010-4345. This is a privilege escalation issue that allows the
exim user to gain root privileges by specifying an alternate
configuration file using the ...