Security Information / 2016 / Security Information -- DSA-3436-1 openssl

Debian Security Advisory

DSA-3436-1 openssl -- security update

Date Reported:

08 Jan 2016

Affected Packages:

openssl

Vulnerable:

Yes

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 https://www.mitls.org/pages/attacks/SLOTH

For the oldstable distribution (wheezy), this problem has been fixed in version 1.0.1e-2+deb7u19.

For the stable distribution (jessie), the testing distribution (stretch) and the unstable distribution (sid), this issue was already addressed in version 1.0.1f-1.

We recommend that you upgrade your openssl packages.