[Full-disclosure] Nuked Klan SP CMS v4.5 - SQL injection Vulnerability
research at vulnerability-lab.com
Thu Jun 14 05:00:40 BST 2012
Nuked Klan SP CMS v4.5 - SQL injection Vulnerability
Common Vulnerability Scoring System:
Nuked-Klan is an open source CMS. It allows you to install and administer a website in a simple and interactive.
It simply requires a hosting PHP / MySQL to work. Nuked-Klan is specialized in network games and clan management
with its version Gamer, however, a general version of SP is named.
(Copy of the Vendor Homepage: http://www.nuked-klan.org/ )
The Vulnerability Laboratory Research Team discovered a critical sql vulnerability and regex ereg bypass in the Nuked Klan SP v4.5 CMS.
2012-06-08: Public Public Disclosure
A SQL Injection vulnerability & a misconfiguration are detected in the Nuked Klan SP v4.5 Content Management System.
The vulnerability allows an attacker (remote) or local low privileged user account to inject/execute own
sql commands on the affected application dbms without user inter action. Successful exploitation of the
vulnerability results in dbms & application compromise. The vulnerabilities are located in misconfigured
regex ereg condition when processing to request the eid variable.
Proof of Concept:
The sql injection vulnerability can be exploited by remote attackers without required user inter action.
For demonstration or reproduce ...
Before continuing to exploit, you need to know the procedure about how "Eid" variable is handled (behind).
First the user is sending a GET request with "eid" as argument then it passed to the function `show_event()`.
Now we review the content of the file "/modules/Calendar/index.php " as example ...
global $bgcolor2, $eid, $type, $d, $m, $y, $user, $nuked, $theme, $language;
if ($type == "birthday" && ereg("[a-zA-Z0-9]+$", $eid))
$sql = mysql_query("SELECT pseudo, prenom, age FROM " . USER_TABLE . " WHERE id = '" . $eid . "'");
list($pseudo, $prenom, $birthday) = mysql_fetch_array($sql);
$pseudo = stripslashes($pseudo);
$prenom = stripslashes($prenom); ...
This function will check if a variable contains only alpha-num characters or not, as you can see on this regex
ereg("[a-zA-Z0-9]+$", $eid) the programmer has forget to add begin check `^`. Remote attackers can bypass the
validation by adding any own special character like (+,--,#,% ) followed by the string to validate the above condition.
The security risk of the sql injection vulnerability is estimated as high.
Vulnerability Laboratory [Research Team] - Karim H.B. (kami at vulnerability-lab.com)
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