[Full-disclosure] LifeSize Room Vulnerabilities

["Spencer J. McIntyre" <smcintyre@xxxxxxxxxxxxxxx>]

Discovered: 07-13-11
By: Spencer McIntyre (zeroSteiner) SecureState R&D Team
www.securestate.com


Background:
-----------
Multiple vulnerabilities within the LifeSize Room appliance.


Vulnerability Summaries:
------------------------
Login page can be bypassed, granting administrative access to the web interface.
Unauthenticated OS command injection is possible through the web interface.
The easiest way to perform these attacks is using a web proxy.


Vulnerable Versions:
--------------------
Tested on LifeSize Room versions 3.5.3 and 4.7.18, others may be vulnerable.


Authentication By Pass:
-----------------------
Following the request to /gateway.php that references the 
LSRoom_Remoting.authenticate
function, modify the AMF data in the response from the server to change "false" 
to "true"
Example:
Original False AMF: 
"\x0d\x0a\x0d\x0a\x00\x00\x00\x00\x00\x01\x00\x0c\x2f\x35\x37\x2f\x6f\x6e\x52\x65\x73\x75\x6c\x74\x00\x04\x6e\x75\x6c\x6c\x00\x00\x00\x02\x01\x00"
Modified True AMF:  
"\x0d\x0a\x0d\x0a\x00\x00\x00\x00\x00\x01\x00\x0c\x2f\x35\x37\x2f\x6f\x6e\x52\x65\x73\x75\x6c\x74\x00\x04\x6e\x75\x6c\x6c\xff\xff\xff\xff\x01\x01"


Command Injection:
------------------
The request to /gateway.php references a vulnerable function 
LSRoom_Remoting.doCommand
within the encoded AMF data.  The original parameter for the vulnerable 
function is
"pref -l /var/system/upgrade/status"  Replace this part with the command to be 
executed.
Authentication to the web application is not necessary however a valid PHP 
session ID
must be passed within the request.


References:
-----------
CVE-2011-2762 - authentication bypass
CVE-2011-2763 - OS command injection

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