USN-3064-1: GnuPG vulnerability

18 August 2016

gnupg vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

GnuPG incorrectly generated random numbers.

Software Description

  • gnupg - GNU privacy guard - a free PGP replacement

Details

Felix Dörre and Vladimir Klebanov discovered that GnuPG incorrectly handled mixing functions in the random number generator. An attacker able to obtain 4640 bits from the RNG can trivially predict the next 160 bits of output.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04 LTS
gnupg - 1.4.20-1ubuntu3.1
Ubuntu 14.04 LTS
gnupg - 1.4.16-1ubuntu2.4
Ubuntu 12.04 LTS
gnupg - 1.4.11-3ubuntu2.10

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References