USN-1923-1: GnuPG, Libgcrypt vulnerability

Publication date

1 August 2013

Overview

GnuPG and Libgcrypt could be made to expose sensitive information.


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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
13.04 raring libgcrypt11 –  1.5.0-3ubuntu2.2
gnupg –  1.4.12-7ubuntu1.1
12.10 quantal libgcrypt11 –  1.5.0-3ubuntu1.1
gnupg –  1.4.11-3ubuntu4.2
12.04 precise libgcrypt11 –  1.5.0-3ubuntu0.2
gnupg –  1.4.11-3ubuntu2.3
10.04 lucid libgcrypt11 –  1.4.4-5ubuntu2.2
gnupg –  1.4.10-2ubuntu1.3

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


Have additional questions?

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