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=========================================================== Ubuntu Security Notice USN-432-1 March 08, 2007 gnupg vulnerability CVE-2007-1263 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 5.10 Ubuntu 6.06 LTS Ubuntu 6.10 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 5.10: gnupg 1.4.1-1ubuntu1.7 Ubuntu 6.06 LTS: gnupg 1.4.2.2-1ubuntu2.5 Ubuntu 6.10: gnupg 1.4.3-2ubuntu3.3 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: 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.