Andreas Metzler uploaded new packages for exim4 which fixed the
following security problems:
CVE-2011-1407
command injection attack in DKIM processing code
For the lenny-backports distribution the problems have been fixed in
version 4.72-6+squeeze2~bpo50+1.
For the stable distribution (squeeze), this problem has been fixed in
version 4.72-6+squeeze2.
For the unstable distribution (sid), this problem has been fixed in
version 4.76-1.
If you don't use pinning (see [1]) you have to update the package
manually via "apt-get -t lenny-backports install <packagelist>" with
the packagelist of your installed packages affected by this update.
[1] <https://backports.debian.org/Instructions>
We recommend to pin (in /etc/apt/preferences) the backports repository to
200 so that new versions of installed backports will be installed
automatically.
Package: *
Pin: release a=lenny-backports
Pin-Priority: 200