TITLE:
PHP-Gästebuch "Kommentar" Script Insertion Vulnerability

SECUNIA ADVISORY ID:
SA19810

VERIFY ADVISORY:
http://secunia.com/advisories/19810/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
francl.de Gästebuch 1.x
http://secunia.com/product/1919/

DESCRIPTION:
Lipako GmbH has reported a vulnerability in PHP-Gästebuch, which can
be exploited by malicious people to conduct script insertion
attacks.

Input passed to the "Kommentar" form field parameter in
guestbook_newentry.php is not properly sanitised before being
returned to the user. This can be exploited to execute arbitrary HTML
and script code in a user's browser session in context of an affected
site when malicious entry is viewed.

The vulnerability has been reported in version 1.61. Other versions
may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
Lipako GmbH, Wismar

ORIGINAL ADVISORY:
http://osvdb.org/ref/23/23962-gastebuch.txt

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