TITLE:
G-Book "g_message" Script Insertion Vulnerability

SECUNIA ADVISORY ID:
SA19414

VERIFY ADVISORY:
http://secunia.com/advisories/19414/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
G-Book 1.x
http://secunia.com/product/8944/

DESCRIPTION:
matrix_killer has discovered a vulnerability in G-Book, which can be
exploited by malicious people to conduct script insertion attacks.

Input passed to the "g_message" parameter in guestbook.php isn't
sanitised before being stored as a guestbook entry. This can be
exploited to execute arbitrary HTML and script code in the
administrator user's and the user's browser session in context of an
affected website when a malicious guestbook entry is viewed.

The vulnerability has been confirmed in version 1.0. Other versions
may also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised.

PROVIDED AND/OR DISCOVERED BY:
matrix_killer, h4cky0u Security Forums.

ORIGINAL ADVISORY:
http://www.h4cky0u.org/advisories/HYSA-2006-006-g-book.txt

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