From: Secunia Security Advisories (sec-advsecunia.com)
Date: Fri Dec 24 2004 - 09:21:50 CST

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TITLE:
Zeroboard Two Vulnerabilities

SECUNIA ADVISORY ID:
SA13649

VERIFY ADVISORY:
http://secunia.com/advisories/13649/

CRITICAL:
Highly critical

IMPACT:
Cross Site Scripting, System access

WHERE:
From remote

SOFTWARE:
Zeroboard 4.x
http://secunia.com/product/4457/

DESCRIPTION:
Jeremy Bae has reported two vulnerabilities in Zeroboard, which can
be exploited by malicious people to compromise a vulnerable system
and conduct cross-site scripting attacks.

1) Input passed to the "_zb_path" parameter in "outlogin.php" and
"dir" parameter in "write.php" isn't properly verified, before it is
used to include files. This can be exploited to include arbitrary
files from external and local resources.

Successful exploitation requires "register_globals" to be enabled.
The script "outlogin.php" can only be exploited on systems where PHP
5.x is used.

2) Input passed to the "user_id" parameter in "check_user_id.php"
isn't properly sanitised before being returned to the user. This can
be exploited to execute arbitrary HTML and script code in a user's
browser session in context of a vulnerable site.

The vulnerabilities have been reported in version 4.1pl4. Other
versions may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
Jeremy Bae, STG Security.

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