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TITLE:
Big Blue Guestbook "comments" Script Insertion

SECUNIA ADVISORY ID:
SA24997

VERIFY ADVISORY:
http://secunia.com/advisories/24997/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
Big Blue Guestbook
http://secunia.com/product/14021/

DESCRIPTION:
seko has discovered a vulnerability in Big Blue Guestbook, which can
be exploited by malicious people to conduct cross-site scripting
attacks.

Input passed to the "comments" parameter in signguestbook.php is not
properly sanitised before being stored. 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.

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

PROVIDED AND/OR DISCOVERED BY:
seko

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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.

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