Debian 3.0 DSA-259-1 Critical: Qpopper Privilege Escalation Exploit

Florian Heinz <heinz@cronon-ag.de> posted to the Bugtraq mailing list an
exploit for qpopper based on a bug in the included vsnprintf implementation.
The sample exploit requires a valid user account and password, and overflows a
string in the pop_msg() function to give the user "mail" group privileges and a
shell on the system. Since the Qvsnprintf function is used elsewhere in
qpopper, additional exploits may be possible.

The qpopper package in Debian 2.2 (potato) does not include the vulnerable
snprintf implementation. For Debian 3.0 (woody) an updated package is available
in version 4.0.4-2.woody.3. Users running an unreleased version of Debian
should upgrade to 4.0.4-9 or newer. We recommend you upgrade your qpopper
package immediately.

Upgrade Instructions
--------------------

wget url
will fetch the file for you
dpkg -i file.deb
will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
will update the internal ...