[SA21549] Doika Guestbook "page" Script Insertion Vulnerability

TITLE:
Doika Guestbook "page" Script Insertion Vulnerability

SECUNIA ADVISORY ID:
SA21549

VERIFY ADVISORY:
http://secunia.com/advisories/21549/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
Doika Guestbook 2.x
http://secunia.com/product/11638/

DESCRIPTION:
Aliaksandr Hartsuyeu has reported a vulnerability in Doika Guestbook,
which can be exploited by malicious people to conduct script insertion
attacks.

Input passed to the "page" form field parameter in gbook.php is not
properly sanitised before being used. This can be exploited to insert
arbitrary HTML and script code, which is executed in a user's browser
session in context of an affected site when the malicious entry is
viewed.

The vulnerability has been reported in version 2.5. Other versions
may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
Aliaksandr Hartsuyeu

ORIGINAL ADVISORY:
http://evuln.com/vulns/134/summary.html

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/

Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.