LifeSize Room Command Injection

2011.09.05
Risk: High
Local: No
Remote: Yes
CWE: CWE-20


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

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\x6 e\x52\x65\x73\x75\x6c\x74\x00\x04\x6e\x75\x6c\x6c\x00\x00\x00\x02\x01\x0 0" Modified True AMF: "\x0d\x0a\x0d\x0a\x00\x00\x00\x00\x00\x01\x00\x0c\x2f\x35\x37\x2f\x6f\x6 e\x52\x65\x73\x75\x6c\x74\x00\x04\x6e\x75\x6c\x6c\xff\xff\xff\xff\x01\x0 1" 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

References:

http://www.kb.cert.org/vuls/id/213486
http://xforce.iss.net/xforce/xfdb/69444
http://www.securityfocus.com/bid/49330
http://www.securityfocus.com/archive/1/archive/1/519463/100/0/threaded
http://www.securestate.com/Documents/LifeSize_Room_Advisory.txt
http://www.exploit-db.com/exploits/17743


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