==========================================================================
Ubuntu Security Notice USN-3318-1
June 13, 2017

gnutls26, gnutls28 vulnerabilities
==========================================================================

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

– Ubuntu 17.04
– Ubuntu 16.10
– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in GnuTLS.

Software Description:
– gnutls28: GNU TLS library
– gnutls26: GNU TLS library

Details:

Hubert Kario discovered that GnuTLS incorrectly handled decoding a status
response TLS extension. A remote attacker could possibly use this issue to
cause GnuTLS to crash, resulting in a denial of service. This issue only
applied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-7507)

It was discovered that GnuTLS incorrectly handled decoding certain OpenPGP
certificates. A remote attacker could use this issue to cause GnuTLS to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2017-7869)

Update instructions:

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

Ubuntu 17.04:
libgnutls30 3.5.6-4ubuntu4.1

Ubuntu 16.10:
libgnutls30 3.5.3-5ubuntu1.2

Ubuntu 16.04 LTS:
libgnutls30 3.4.10-4ubuntu1.3

Ubuntu 14.04 LTS:
libgnutls26 2.12.23-12ubuntu2.8

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

References:
https://www.ubuntu.com/usn/usn-3318-1
CVE-2017-7507, CVE-2017-7869

Package Information:
https://launchpad.net/ubuntu/+source/gnutls28/3.5.6-4ubuntu4.1
https://launchpad.net/ubuntu/+source/gnutls28/3.5.3-5ubuntu1.2
https://launchpad.net/ubuntu/+source/gnutls28/3.4.10-4ubuntu1.3
https://launchpad.net/ubuntu/+source/gnutls26/2.12.23-12ubuntu2.8

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