USN-2540-1: GnuTLS vulnerabilities

Releases

• Ubuntu 14.10
• Ubuntu 14.04 ESM
• Ubuntu 12.04
• Ubuntu 10.04

Packages

• gnutls26 - GNU TLS library
• gnutls28 - GNU TLS library

Details

It was discovered that GnuTLS did not perform date and time checks on
CA certificates, contrary to expectations. This issue only affected
Ubuntu 10.04 LTS. (CVE-2014-8155)

Nikos Mavrogiannopoulos discovered that GnuTLS incorrectly verified that
signature algorithms matched. A remote attacker could possibly use this
issue to downgrade to a disallowed algorithm. This issue only affected
Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-0282)

It was discovered that GnuTLS incorrectly verified certificate algorithms.
A remote attacker could possibly use this issue to downgrade to a
disallowed algorithm. (CVE-2015-0294)

Update instructions

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

Ubuntu 14.10

• libgnutls-deb0-28 - 3.2.16-1ubuntu2.2

Ubuntu 14.04

• libgnutls26 - 2.12.23-12ubuntu2.2

Ubuntu 12.04

• libgnutls26 - 2.12.14-5ubuntu3.9

Ubuntu 10.04

• libgnutls26 - 2.8.5-2ubuntu0.7

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

References

• CVE-2014-8155
• CVE-2015-0282
• CVE-2015-0294