TITLE:
GnuPG "gpgv" Signature Verification Security Issue

SECUNIA ADVISORY ID:
SA18845

VERIFY ADVISORY:
http://secunia.com/advisories/18845/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
GnuPG / gpg 1.4.x
http://secunia.com/product/8087/
GnuPG / gpg 1.0.x
http://secunia.com/product/2573/
GnuPG / gpg 1.2.x
http://secunia.com/product/309/
GnuPG / gpg 1.3.x
http://secunia.com/product/2591/

DESCRIPTION:
A security issue has been reported in GnuPG, which potentially can be
exploited by malicious people to bypass certain security
restrictions.

The security issue is caused due to "gpgv" exiting with a return code
of 0 even if the detached signature file did not carry any signature.
This may result in certain scripts that use "gpgv" to conclude that
the signature is correctly verified.

Successful exploitation requires that "gpgv" or "gpg --verify" is
used from a script that determines whether the file signature is
correctly verified based on the return code.

The security issue has been reported in versions prior to 1.4.2.1.

SOLUTION:
Update to version 1.4.2.1.
http://www.gnupg.org/(en)/download/index.html

PROVIDED AND/OR DISCOVERED BY:
The vendor credits the Gentoo project.

ORIGINAL ADVISORY:
http://lists.gnupg.org/pipermail/gnupg-announce/2006q1/000211.html

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