USN-3318-1: GnuTLS vulnerabilities

Ubuntu Security Notice USN-3318-1

13th June, 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

  • gnutls26 - GNU TLS library
  • gnutls28 - 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 version:

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

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-2017-7507, CVE-2017-7869