USN-432-1: GnuPG vulnerability

8 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

Software Description


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 versions:

Ubuntu 6.10
gnupg - 1.4.3-2ubuntu3.3
Ubuntu 6.06 LTS
gnupg -
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.