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TITLE:
Jax Guestbook Cross-Site Scripting and Information Disclosure

SECUNIA ADVISORY ID:
SA16337

VERIFY ADVISORY:
http://secunia.com/advisories/16337/

CRITICAL:
Less critical

IMPACT:
Cross Site Scripting, Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
Jax Guestbook 3.x
http://secunia.com/product/5494/

DESCRIPTION:
Lostmon has discovered some vulnerabilities in Jax Guestbook, which
can be exploited by malicious people to conduct cross-site scripting
attacks or disclose certain sensitive information.

1) Input passed to the "language", "gmt_ofs" and "page" parameters
isn't properly sanitised before being returned to users. This can be
exploited to execute arbitrary HTML and script code in a user's
browser session in context of a vulnerable site.

2) Accessing the "guestbook" and "guestbook_ips2block" files directly
discloses certain sensitive information (e.g. IP addresses of users
who have posted ).

The vulnerabilities have been confirmed in version 3.3 and have also
been reported in versions 3.1 and 3.31. Other versions may also be
affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised. Use
a database instead of CSV files to store guestbook data.

PROVIDED AND/OR DISCOVERED BY:
Lostmon

ORIGINAL ADVISORY:
http://lostmon.blogspot.com/2005/08/jax-php-scripts-multiple.html

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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.

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


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