[SA19098] DVguestbook "dv_gbook.php" Cross-Site Scripting Vulnerability

TITLE:
DVguestbook "dv_gbook.php" Cross-Site Scripting Vulnerability

SECUNIA ADVISORY ID:
SA19098

VERIFY ADVISORY:
http://secunia.com/advisories/19098/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
DVguestbook 1.x
http://secunia.com/product/8572/

DESCRIPTION:
Liz0ziM has discovered a vulnerability in DVguestbook, which can be
exploited by malicious people to conduct cross-site scripting
attacks.

Input passed to the "f" parameter in "dv_gbook.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.

Successful exploitation requires "register_globals" to be enabled.

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

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

Set "register_globals" to "Off".

PROVIDED AND/OR DISCOVERED BY:
Liz0ziM

ORIGINAL ADVISORY:
http://biyosecurity.be/bugs/dvguestbook.txt

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