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TITLE:
Horde IMP / Groupware Webmail PGP Key Caching Vulnerability

SECUNIA ADVISORY ID:
SA34796

VERIFY ADVISORY:
http://secunia.com/advisories/34796/

DESCRIPTION:
A vulnerability has been reported in Horde IMP and Horde Groupware
Webmail Edition, which can be exploited by malicious users to conduct
spoofing attacks.

The vulnerability is caused due to the application caching PGP keys
from local address books. This can be exploited to insert manipulated
public PGP keys to the cache, which can result e.g. in incorrectly
signed incoming messages being displayed as valid.

Successful exploitation requires a valid user account and that
caching and PGP support is enabled.

The vulnerability is reported in Horde Groupware Webmail Edition 1.1
through 1.2.2 and Horde IMP prior to version 4.3.4.

SOLUTION:
Fixed in Webmail Edition 1.2.3-RC1 and IMP 4.3.4.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Peter Meier.

ORIGINAL ADVISORY:
http://cvs.horde.org/diff.php/groupware/docs/webmail/CHANGES?r1=1.35.2.1&r2=1.35.2.2&ty=h
http://cvs.horde.org/diff.php/imp/docs/CHANGES?r1=1.699.2.376&r2=1.699.2.389&ty=h

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