Russ Allbery uploaded new packages for openafs which fixed the following
security problems:

CVE-2011-0430 (DSA-2168-1)

  Andrew Deason discovered that a double free in the Rx server process
  could lead to denial of service or the execution of arbitrary code.
  This affects the server components of the openafs package.

CVE-2011-0431 (DSA-2168-1)

  It was discovered that insufficient error handling in the kernel module
  could lead to denial of service.  A local user can induce a kernel panic
  in the OpenAFS client.  This affects the kernel module component of the
  openafs package.

Note that for the fix to CVE-2011-0431, you must rebuild the OpenAFS
kernel module and unload and reload the newly built kernel module after
upgrading openafs-modules-source or openafs-modules-dkms, whichever you
use.

For the lenny-backports distribution the problems have been fixed in
version 1.4.12.1+dfsg-4~bpo50+1.

For the oldstable distribution (lenny), this problem has been fixed in
version 1.4.7.dfsg1-6+lenny4.

For the stable distribution (squeeze), this problem has been fixed in
version 1.4.12.1+dfsg-4.

For the unstable distribution (sid), this problem has been fixed in
version 1.4.14+dfsg-1.

These problems were fixed upstream in the 1.4.14 release.

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