USN-3183-2: GnuTLS vulnerability
20 March 2017
GnuTLS could be made to hang if it received specially crafted network traffic.
Releases
Packages
- gnutls26 - GNU TLS library
Details
USN-3183-1 fixed CVE-2016-8610 in GnuTLS in Ubuntu 16.04 LTS and Ubuntu
16.10. This update provides the corresponding update for Ubuntu 12.04 LTS
and Ubuntu 14.04 LTS.
Original advisory 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 14.04
Ubuntu 12.04
In general, a standard system update will make all the necessary changes.
References
Related notices
- USN-3183-1: gnutls26, gnutls-doc, libgnutls26, libgnutls-dev, libgnutlsxx27, guile-gnutls, libgnutls30, libgnutls-openssl27, gnutls-bin, libgnutlsxx28, gnutls28, gnutls26-doc, libgnutls28-dev
- USN-3181-1: libcrypto1.0.0-udeb, openssl, libssl1.0.0-udeb, libssl-dev, libssl-doc, libssl1.0.0