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=========================================================== Ubuntu Security Notice USN-678-1 November 26, 2008 gnutls12, gnutls13, gnutls26 vulnerability CVE-2008-4989 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 7.10 Ubuntu 8.04 LTS Ubuntu 8.10 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: libgnutls12 1.2.9-2ubuntu1.3 Ubuntu 7.10: libgnutls13 1.6.3-1ubuntu0.2 Ubuntu 8.04 LTS: libgnutls13 2.0.4-1ubuntu2.2 Ubuntu 8.10: libgnutls26 2.4.1-1ubuntu0.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: 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)