RSLinx Classic and FactoryTalk Linx Gateway Privilege Escalation

Credit: LiquidWorm
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264

CVSS Base Score: 4.6/10
Impact Subscore: 6.4/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

# Title: RSLinx Classic and FactoryTalk Linx Gateway - Privilege Escalation # Date: 2017-12-11 # Author: LiquidWorm # Vendor: Rockwell Automation, Inc. # Product web page: # Affected version: Rockwell Automation RSLinx Classic 3.90.01 # Rockwell Automation RSLinx Classic 3.73.00 # Rockwell Automation RSLinx Classic 3.72.00 # Rockwell Automation RSLinx Classic 2.58.00 # Rockwell Automation FactoryTalk Linx Gateway 3.90.00 # CVE: CVE-2018-10619 # Tested on: Microsoft Windows 7 Professional SP1 (EN) # Summary: # The FactoryTalk Linx Gateway adds a Classic OPC DA and OPC UA server # interface to deliver information collected by FactoryTalk Linx from Logix5000™ # and other Allen-Bradley® controllers to external OPC clients, permitting # third-party software to coexist with FactoryTalk® software. # PoC: The application suffers from an unquoted search path issue impacting the service 'dnwhodisp' for Windows deployed as part of RSLinx and FactoryTalk. 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 user's code would execute with the elevated privileges of the application. C:\>sc qc dnwhodisp [SC] QueryServiceConfig SUCCESS SERVICE_NAME: dnwhodisp TYPE : 10 WIN32_OWN_PROCESS START_TYPE : 3 DEMAND_START ERROR_CONTROL : 1 NORMAL BINARY_PATH_NAME : C:\Program Files (x86)\Rockwell Software\RSLINX\dnwhodisp.exe LOAD_ORDER_GROUP : TAG : 0 DISPLAY_NAME : dnWhoDisp DEPENDENCIES : RPCSS SERVICE_START_NAME : LocalSystem

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