Schneider Electric Pelco VideoXpert Privilege Escalation

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Schneider Electric Pelco VideoXpert Privilege Escalations  
  
  
Vendor: Schneider Electric SE  
Product web page: https://www.pelco.com  
Affected version: Core Software 1.12.105  
Media Gateway Software 1.12.26  
Exports 1.12  
  
  
Summary: VideoXpert is a video management solution designed for  
scalability, fitting the needs surveillance operations of any size.  
VideoXpert Ultimate can also aggregate other VideoXpert systems,  
tying multiple video management systems into a single interface.  
  
Desc: The application is vulnerable to an elevation of privileges  
vulnerability which can be used by a simple user that can change  
the executable file with a binary of choice. The vulnerability exist  
due to the improper permissions, with the 'F' flag (full) for the  
'Users' group, for several binary files. The service is installed  
by default to start on system boot with LocalSystem privileges.  
Attackers can replace the binary with their rootkit, and on reboot  
they get SYSTEM privileges.  
  
VideoXpert services also suffer from an unquoted search path issue  
impacting the 'VideoXpert Core' and 'VideoXpert Exports' services  
for Windows deployed as part of the VideoXpert Setup bundle. This  
could potentially allow an authorized but non-privileged local user  
to execute arbitrary code with elevated privileges on the system. A   
successful attempt would require the local user to be able to insert  
their code in the system root path undetected by the OS or other security  
applications where it could potentially be executed during application  
startup or reboot. If successful, the local useras code would execute  
with the elevated privileges of the application.  
  
Tested on: Microsoft Windows 7 Professional SP1 (EN)  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2017-5418  
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5418.php  
  
  
05.04.2017  
  
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C:\Program Files\Pelco\Core>sc qc "VideoXpert Core"  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: VideoXpert Core  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START (DELAYED)  
ERROR_CONTROL : 1 NORMAL  
BINARY_PATH_NAME : C:\Program Files\Pelco\Core\tools\nssm.exe  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : VideoXpert Core  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
  
C:\>cacls "C:\Program Files\Pelco\Core\tools\nssm.exe"  
C:\Program Files\Pelco\Core\tools\nssm.exe NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Administrators:(ID)F  
BUILTIN\Users:(ID)R  
  
  
C:\ProgramData\Pelco\Core\db\bin>cacls * |findstr "Users:(ID)F"  
C:\ProgramData\Pelco\Core\db\bin\libeay32.dll BUILTIN\Users:(ID)F  
C:\ProgramData\Pelco\Core\db\bin\mongod.exe BUILTIN\Users:(ID)F  
C:\ProgramData\Pelco\Core\db\bin\mongos.exe BUILTIN\Users:(ID)F  
C:\ProgramData\Pelco\Core\db\bin\nssm.exe BUILTIN\Users:(ID)F  
C:\ProgramData\Pelco\Core\db\bin\ssleay32.dll BUILTIN\Users:(ID)F  
  
  
C:\>cacls "C:\ProgramData\Pelco\Exports\bin\nssm.exe"  
C:\ProgramData\Pelco\Exports\bin\nssm.exe BUILTIN\Users:(ID)F  
NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Administrators:(ID)F  
  
  
C:\>cacls "C:\ProgramData\Pelco\Gateway\bin\nssm.exe"  
C:\ProgramData\Pelco\Gateway\bin\nssm.exe BUILTIN\Users:(ID)F  
NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Administrators:(ID)F  
  
  
  
C:\Users\senad>sc qc "VideoXpert Exports"  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: VideoXpert Exports  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 1 NORMAL  
BINARY_PATH_NAME : C:\ProgramData\Pelco\Exports\bin\nssm.exe  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : VideoXpert Exports  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
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