[UNIX] JSBoard Multiple Extensions Vulnerability
From: SecuriTeam (support_at_securiteam.com)
Date: 12/28/04
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To: list@securiteam.com Date: 28 Dec 2004 16:48:59 +0200
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JSBoard Multiple Extensions Vulnerability
------------------------------------------------------------------------
SUMMARY
<http://kldp.net/projects/jsboard/> JSBoard is "one of widely used web
BBS applications in Korea". However, an input validation flaw in JSBoard
allows a malicious attackers to run arbitrary commands with the privileges
of the HTTPD process, which is typically run as the nobody user.
DETAILS
Vulnerable Systems:
* JSBoard version 2.0.8 and prior
* JSBoard version JSBoard 1.3.11 and prior
Immune Systems:
* JSBoard version 2.0.9 or newer
* JSBoard version JSBoard 1.3.12 or newer
JSBoard doesn't implemented any type of check in "include/parse.php" for
multiple extensions of uploaded files, e.g. attack.php.rar. Therefore,
malicious attackers can upload arbitrary script files (PHP, pl, CGI, etc)
to a web server. This is vulnerability is caused by Apache's MIME module
(mod_mime), which regards attack.php.rar as a normal PHP file and execute
the file through mod_php module with the privilege of the HTTPD process.
Disclosure Timeline:
2004-12-08 Vulnerability found
2004-12-08 JSBoard developer notified
2004-12-09 Update version released
2004-12-15 Official release
ADDITIONAL INFORMATION
The information has been provided by <mailto:advisory@stgsecurity.com>
SSR Team.
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