USN-432-1: GnuPG vulnerability

Ubuntu Security Notice USN-432-1

8th March, 2007

gnupg vulnerability

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

  • Ubuntu 6.10
  • Ubuntu 6.06 LTS
  • Ubuntu 5.10


Gerardo Richarte from Core Security Technologies discovered that when
gnupg is used without --status-fd, there is no way to distinguish
initial unsigned messages from a following signed message. An attacker
could inject an unsigned message, which could fool the user into
thinking the message was entirely signed by the original sender.

Update instructions

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

Ubuntu 6.10:
gnupg 1.4.3-2ubuntu3.3
Ubuntu 6.06 LTS:
Ubuntu 5.10:
gnupg 1.4.1-1ubuntu1.7

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the
necessary changes.