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TITLE:
Creative Guestbook Authentication Bypass and Script Insertion

SECUNIA ADVISORY ID:
SA24536

VERIFY ADVISORY:
http://secunia.com/advisories/24536/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting, Manipulation of data, Security Bypass

WHERE:
>From remote

SOFTWARE:
Creative Guestbook 1.x
http://secunia.com/product/13677/

DESCRIPTION:
Dj7xpl has discovered some vulnerabilities in Creative Guestbook,
which can be exploited by malicious people to bypass certain security
restrictions, manipulate data, and conduct cross-site scripting
attacks.

1) The vulnerability is caused due to improper authentication
verification in createadmin.php. This can be exploited to create a
new administrator user, who can manipulate data.

2) Input passed to the "Name", "Homepage", "Titel", and "Kommentar"
form fields in schreiben.php is not properly sanitised before being
used. This can be exploited to insert arbitrary HTML and script code,
which can be executed in a user's browser session in context of an
affected site when the guestbook is viewed.

The vulnerabilities are confirmed in version 1.0. Other versions may
also be affected.

SOLUTION:
Restrict access to the "createadmin.php" script (e.g. with
".htaccess").

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

PROVIDED AND/OR DISCOVERED BY:
Dj7xpl

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/3489

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About:
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vulnerabilities.

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http://secunia.com/about_secunia_advisories/


Please Note:
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use those supplied by the vendor.

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