Nuked Klan SP CMS 4.5 – SQL Injection
Title: ====== Nuked Klan SP CMS v4.5 - SQL injection Vulnerability Date: ===== 2012-06-09 References: =========== http://www.vulnerability-lab.com/get_content.php?id=610 VL-ID: ===== 610 Common Vulnerability Scoring System: ==================================== 8 Introduction: ============= 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/ ) Abstract: ========= The Vulnerability Laboratory Research Team discovered a critical sql vulnerability and regex ereg bypass in the Nuked Klan SP v4.5 CMS. Report-Timeline: ================ 2012-06-08: Public Public Disclosure Status: ======== Published Exploitation-Technique: ======================= Remote Severity: ========= High Details: ======== 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. Vulnerable File(s): [+] index.php Vulnerable Parameter(s): [+] eid 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 ... function show_event() { 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. PoC: http://127.0.0.1:80/nk/index.php?file=Calendar&nuked_nude=index&op=show_event&eid= 0'union+select+version(),concat(pseudo,0x3a,pass,0x3a,email),3+from+nuked_users+where%20'vuln-lab'='vuln-lab&type=birthday Risk: ===== The security risk of the sql injection vulnerability is estimated as high. Credits: ======== Vulnerability Laboratory [Research Team] - Karim H.B. (kami@vulnerability-lab.com) Disclaimer: =========== The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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