USN-3675-2: GnuPG 2 vulnerability

15 June 2018

gnupg2 vulnerability

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

  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

GnuPG 2 could be made to present validity information incorrectly.

Software Description

  • gnupg2 - GNU privacy guard - a free PGP replacement

Details

USN-3675-1 fixed a vulnerability in GnuPG 2 for Ubuntu 18.04 LTS and Ubuntu 17.10. This update provides the corresponding update for GnuPG 2 in Ubuntu 16.04 LTS and Ubuntu 14.04 LTS.

Original advisory details:

Marcus Brinkmann discovered that during decryption or verification, GnuPG did not properly filter out terminal sequences when reporting the original filename. An attacker could use this to specially craft a file that would cause an application parsing GnuPG output to incorrectly interpret the status of the cryptographic operation reported by GnuPG.

Update instructions

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

Ubuntu 16.04 LTS
gnupg2 - 2.1.11-6ubuntu2.1
Ubuntu 14.04 LTS
gnupg2 - 2.0.22-3ubuntu1.4

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