USN-1987-1: GnuPG vulnerabilities

Ubuntu Security Notice USN-1987-1

9th October, 2013

gnupg, gnupg2 vulnerabilities

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

  • Ubuntu 13.04
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in GnuPG.

Software description

  • gnupg - GNU privacy guard - a free PGP replacement
  • gnupg2 - GNU privacy guard - a free PGP replacement

Details

Daniel Kahn Gillmor discovered that GnuPG treated keys with empty usage
flags as being valid for all usages. (CVE-2013-4351)

Taylor R Campbell discovered that GnuPG incorrectly handled certain OpenPGP
messages. If a user or automated system were tricked into processing a
specially-crafted message, GnuPG could consume resources, resulting in a
denial of service. (CVE-2013-4402)

Update instructions

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

Ubuntu 13.04:
gnupg2 2.0.19-2ubuntu1.1
gnupg 1.4.12-7ubuntu1.2
Ubuntu 12.10:
gnupg2 2.0.17-2ubuntu3.2
gnupg 1.4.11-3ubuntu4.3
Ubuntu 12.04 LTS:
gnupg2 2.0.17-2ubuntu2.12.04.3
gnupg 1.4.11-3ubuntu2.4
Ubuntu 10.04 LTS:
gnupg2 2.0.14-1ubuntu1.6
gnupg 1.4.10-2ubuntu1.4

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

CVE-2013-4351, CVE-2013-4402