USN-1570-1: GnuPG vulnerability
Ubuntu Security Notice USN-1570-1
17th September, 2012
gnupg, gnupg2 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS
Summary
GnuPG could be tricked into downloading a different key when downloading from a key server.
Software description
- gnupg - GNU privacy guard - a free PGP replacement
- gnupg2 - GNU privacy guard - a free PGP replacement
Details
It was discovered that GnuPG used a short ID when downloading keys from a
keyserver, even if a long ID was requested. An attacker could possibly use
this to return a different key with a duplicate short key id.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 12.04 LTS:
- gnupg2 2.0.17-2ubuntu2.12.04.1
- gnupg 1.4.11-3ubuntu2.1
- Ubuntu 11.10:
- gnupg2 2.0.17-2ubuntu2.11.10.1
- gnupg 1.4.11-3ubuntu1.11.10.1
- Ubuntu 11.04:
- gnupg2 2.0.14-2ubuntu1.2
- gnupg 1.4.11-3ubuntu1.11.04.1
- Ubuntu 10.04 LTS:
- gnupg2 2.0.14-1ubuntu1.4
- gnupg 1.4.10-2ubuntu1.1
- Ubuntu 8.04 LTS:
- gnupg2 2.0.7-1ubuntu0.2
- gnupg 1.4.6-2ubuntu5.1
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.