USN-3183-1: GnuTLS vulnerabilities

Releases

• Ubuntu 16.10
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• gnutls26 - GNU TLS library
• gnutls28 - 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

• libgnutls30 - 3.4.10-4ubuntu1.2

Ubuntu 14.04

• libgnutls26 - 2.12.23-12ubuntu2.6

Ubuntu 12.04

• libgnutls26 - 2.12.14-5ubuntu3.13

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

References

• CVE-2016-7444
• CVE-2016-8610
• CVE-2017-5334
• CVE-2017-5335
• CVE-2017-5336
• CVE-2017-5337

Related notices

• USN-3183-2: libgnutls-openssl27, libgnutls-dev, gnutls-bin, gnutls26, libgnutlsxx27, libgnutls26, gnutls26-doc
• USN-3181-1: libssl1.0.0-udeb, libssl-dev, libssl-doc, openssl, libcrypto1.0.0-udeb, libssl1.0.0