USN-1923-1: GnuPG, Libgcrypt vulnerability

Releases

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

Packages

• gnupg - GNU privacy guard - a free PGP replacement
• libgcrypt11 - LGPL Crypto library - runtime library

Details

Yuval Yarom and Katrina Falkner discovered a timing-based information leak,
known as Flush+Reload, that could be used to trace execution in programs.
GnuPG and Libgcrypt followed different execution paths based on key-related
data, which could be used to expose the contents of private keys.

Update instructions

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

Ubuntu 13.04

• libgcrypt11 - 1.5.0-3ubuntu2.2
• gnupg - 1.4.12-7ubuntu1.1

Ubuntu 12.10

• libgcrypt11 - 1.5.0-3ubuntu1.1
• gnupg - 1.4.11-3ubuntu4.2

Ubuntu 12.04

• libgcrypt11 - 1.5.0-3ubuntu0.2
• gnupg - 1.4.11-3ubuntu2.3

Ubuntu 10.04

• libgcrypt11 - 1.4.4-5ubuntu2.2
• gnupg - 1.4.10-2ubuntu1.3

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

References

• CVE-2013-4242