Debian Security Advisory 1266-1 - Gerardo Richarte discovered that GnuPG, a free PGP replacement, provides insufficient user feedback if an OpenPGP message contains both unsigned and signed portions. Inserting text segments into an otherwise signed message could be exploited to forge the content of signed messages. This update prevents such attacks; the old behaviour can still be activated by passing the --allow-multiple-messages option.
ff2d443868ea9134e4a2821505f07b5d67eda9514390877c76d2ba1676c1cae7Ubuntu Security Notice 432-2 - USN-432-1 fixed a vulnerability in GnuPG. This update provides the corresponding updates for GnuPG2 and the GPGME library. 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.
efd10c3a5bbef4bde937cd14206a894698209116719ed31936c3fa38bf151dd0Mandriva Linux Security Advisory - GnuPG prior to 1.4.7 and GPGME prior to 1.1.4, when run from the command line, did not visually distinguish signed and unsigned portions of OpenPGP messages with multiple components. This could allow a remote attacker to forge the contents of an email message without detection.
b5f3387c0e15f3e5caa78f0a24fad853f5e06d5408aa866da22a14bd113d045aUbuntu Security Notice 432-1 - 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.
b20afc54d5ee0271c49512ca07738acf7c820aafc428e8929919d4c440074d7cCore Security Technologies Advisory - GnuPG and GnuPG clients suffer from an unsigned data injection vulnerability.
105bc292cde7181a51838486efb114fc2b42ca52c8eb7401d9334c18e0c47625
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