Debian Security Advisory

DSA-3437-1 gnutls26 -- security update

Date Reported:
09 Jan 2016
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2015-7575.
More information:

Karthikeyan Bhargavan and Gaetan Leurent at INRIA discovered a flaw in the TLS 1.2 protocol which could allow the MD5 hash function to be used for signing ServerKeyExchange and Client Authentication packets during a TLS handshake. A man-in-the-middle attacker could exploit this flaw to conduct collision attacks to impersonate a TLS server or an authenticated TLS client.

More information can be found at

For the oldstable distribution (wheezy), this problem has been fixed in version 2.12.20-8+deb7u5.

We recommend that you upgrade your gnutls26 packages.