USN-5168-3: NSS vulnerability

USN-5168-3: NSS vulnerability

USN-5168-1 fixed a vulnerability in NSS. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS
signatures. A remote attacker could use this issue to cause NSS to crash,
resulting in a denial of service, or possibly execute arbitrary code.
Source: USN-5168-3: NSS vulnerability