USN-678-1: GnuTLS vulnerability

Ubuntu Security Notice USN-678-1

25th November, 2008

gnutls12, gnutls13, gnutls26 vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 8.10
  • Ubuntu 8.04 LTS
  • Ubuntu 7.10
  • Ubuntu 6.06 LTS

Software description

  • gnutls12
  • gnutls13
  • gnutls26


Martin von Gagern discovered that GnuTLS did not properly verify certificate
chains when the last certificate in the chain was self-signed. If a remote
attacker were able to perform a man-in-the-middle attack, this flaw could be
exploited to view sensitive information. (CVE-2008-4989)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 8.10:
libgnutls26 2.4.1-1ubuntu0.1
Ubuntu 8.04 LTS:
libgnutls13 2.0.4-1ubuntu2.2
Ubuntu 7.10:
libgnutls13 1.6.3-1ubuntu0.2
Ubuntu 6.06 LTS:
libgnutls12 1.2.9-2ubuntu1.3

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the
necessary changes.