[USN-2821-1] GnuTLS vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Mon Nov 30 20:38:18 UTC 2015

Ubuntu Security Notice USN-2821-1
November 30, 2015

gnutls26 vulnerability

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

- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS


GnuTLS could be made to expose sensitive information over the network.

Software Description:
- gnutls26: GNU TLS library


It was discovered that GnuTLS incorrectly validated the first byte of
padding in CBC modes. A remote attacker could possibly use this issue to
perform a padding oracle attack.

Update instructions:

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

Ubuntu 14.04 LTS:
  libgnutls26                     2.12.23-12ubuntu2.3

Ubuntu 12.04 LTS:
  libgnutls26                     2.12.14-5ubuntu3.10

In general, a standard system update will make all the necessary changes.


Package Information:

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