nss - security update

A vulnerability has been found in nss.

• CVE-2015-4000
  With TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is
  enabled on a server but not on a client, does not properly convey
  a DHE_EXPORT choice, which allows man-in-the-middle attackers to
  conduct cipher-downgrade attacks by rewriting a ClientHello with
  DHE replaced by DHE_EXPORT and then rewriting a ServerHello with
  DHE_EXPORT replaced by DHE, aka the Logjam issue.

The solution in nss was to not accept bit lengths less than 1024.
This may potentially be a backwards incompatibility issue but such
low bit lengths should not be in use so it was deemed acceptable.

For Debian 7 Wheezy, these problems have been fixed in version
2:3.14.5-1+deb7u7.

We recommend that you upgrade your nss packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;