TITLE:
Matt Wright Guestbook Script Insertion Vulnerabilities

SECUNIA ADVISORY ID:
SA19586

VERIFY ADVISORY:
http://secunia.com/advisories/19586/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
Matt Wright Guestbook 2.x
http://secunia.com/product/9246/

DESCRIPTION:
Some vulnerabilities have been discovered in Matt Wright Guestbook,
which can be exploited by malicious people to conduct script
insertion attacks.

1) Input passed to the "realname", "username", and "comments"
parameters in guestbook.pl is not properly sanitised before being
used. 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 data is viewed.

2) Input passed to the  "url", "city", "state", "country" parameters
in guestbook.pl is not properly sanitised before being used. 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 data is
viewed.

The vulnerabilities have been confirmed in version 2.3.1. Other
versions may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
1) Liz0ziM

ORIGINAL ADVISORY:
http://liz0zim.no-ip.org/mattguestbook.html

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