a2ps - unsanitised input

Rudolf Polzer discovered a vulnerability in a2ps, a converter and
pretty-printer for many formats to PostScript. The program did not
escape shell meta characters properly which could lead to the
execution of arbitrary commands as a privileged user if a2ps is
installed as a printer filter.

For the stable distribution (woody) this problem has been fixed in
version 4.13b-16woody1.

For the unstable distribution (sid) this problem has been fixed in
version 1:4.13b-4.2.

We recommend that you upgrade your a2ps package.