USN-3183-1: GnuTLS vulnerabilities

1 February 2017

gnutls26, gnutls28 vulnerabilities

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

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in GnuTLS.

Software Description

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

Details

Stefan Buehler discovered that GnuTLS incorrectly verified the serial length of OCSP responses. A remote attacker could possibly use this issue to bypass certain certificate validation measures. This issue only applied to Ubuntu 16.04 LTS. (CVE-2016-7444)

Shi Lei discovered that GnuTLS incorrectly handled certain warning alerts. A remote attacker could possibly use this issue to cause GnuTLS to hang, resulting in a denial of service. This issue has only been addressed in Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-8610)

It was discovered that GnuTLS incorrectly decoded X.509 certificates with a Proxy Certificate Information extension. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2017-5334)

It was discovered that GnuTLS incorrectly handled certain OpenPGP certificates. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-5335, CVE-2017-5336, CVE-2017-5337)

Update instructions

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

Ubuntu 16.10
libgnutls30 - 3.5.3-5ubuntu1.1
Ubuntu 16.04 LTS
libgnutls30 - 3.4.10-4ubuntu1.2
Ubuntu 14.04 LTS
libgnutls26 - 2.12.23-12ubuntu2.6
Ubuntu 12.04 LTS
libgnutls26 - 2.12.14-5ubuntu3.13

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