Ubuntu 14.04 LTS: USN-2021-2 Critical: Libgcrypt Vulnerability

ubuntu

September 17, 2012

GnuPG could be tricked into downloading a different key when downloading from a key server.

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.

Topics Covered

security advisory Ubuntu moderate threat GnuPG keyserver

Update Instructions

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

Ubuntu 12.04 LTS:
  gnupg                           1.4.11-3ubuntu2.1
  gnupg2                          2.0.17-2ubuntu2.12.04.1

Ubuntu 11.10:
  gnupg                           1.4.11-3ubuntu1.11.10.1
  gnupg2                          2.0.17-2ubuntu2.11.10.1

Ubuntu 11.04:
  gnupg                           1.4.11-3ubuntu1.11.04.1
  gnupg2                          2.0.14-2ubuntu1.2

Ubuntu 10.04 LTS:
  gnupg                           1.4.10-2ubuntu1.1
  gnupg2                          2.0.14-1ubuntu1.4

Ubuntu 8.04 LTS:
  gnupg                           1.4.6-2ubuntu5.1
  gnupg2                          2.0.7-1ubuntu0.2

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