USN-1418-1: GnuTLS vulnerabilities

Ubuntu Security Notice USN-1418-1

5th April, 2012

gnutls13, gnutls26 vulnerabilities

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

  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS

Summary

The GnuTLS library could be made to crash under certain conditions.

Software description

  • gnutls13 - the GNU TLS library - commandline utilities
  • gnutls26 - the GNU TLS library - commandline utilities

Details

Alban Crequy discovered that the GnuTLS library incorrectly checked array
bounds when copying TLS session data. A remote attacker could crash a client
application, leading to a denial of service, as the client application prepared
for TLS session resumption. (CVE-2011-4128)

Matthew Hall discovered that the GnuTLS library incorrectly handled TLS
records. A remote attacker could crash client and server applications, leading
to a denial of service, by sending a crafted TLS record. (CVE-2012-1573)

Update instructions

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

Ubuntu 11.10:
libgnutls26 2.10.5-1ubuntu3.1
Ubuntu 11.04:
libgnutls26 2.8.6-1ubuntu2.1
Ubuntu 10.10:
libgnutls26 2.8.6-1ubuntu0.1
Ubuntu 10.04 LTS:
libgnutls26 2.8.5-2ubuntu0.1
Ubuntu 8.04 LTS:
libgnutls13 2.0.4-1ubuntu2.7

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2011-4128, CVE-2012-1573