gnutls13 - potential code execution

Several remote vulnerabilities have been discovered in GNUTLS, an
implementation of the SSL/TLS protocol suite.

NOTE: The libgnutls13 package, which provides the GNUTLS library, does
not contain logic to automatically restart potentially affected
services. You must restart affected services manually (mainly Exim,
using /etc/init.d/exim4 restart) after applying the update, to make
the changes fully effective. Alternatively, you can reboot the system.

The Common Vulnerabilities and Exposures project identifies the following
problems:

• CVE-2008-1948
  A pre-authentication heap overflow involving oversized session
  resumption data may lead to arbitrary code execution.
• CVE-2008-1949
  Repeated client hellos may result in a pre-authentication denial of
  service condition due to a null pointer dereference.
• CVE-2008-1950
  Decoding cipher padding with an invalid record length may cause GNUTLS
  to read memory beyond the end of the received record, leading to a
  pre-authentication denial of service condition.

For the stable distribution (etch), these problems have been fixed in
version 1.4.4-3+etch1. (Builds for the arm architecture are currently
not available and will be released later.)

For the unstable distribution (sid), these problems will be fixed soon.

We recommend that you upgrade your GNUTLS packages.