Rockwell Automation RSLinx Classic / FactoryTalk Linx Gateway Privilege Escalation

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Rockwell Automation RSLinx Classic and FactoryTalk Linx Gateway Privilege Escalation  
  
Vendor: Rockwell Automation, Inc.  
Product web page: https://www.rockwellautomation.com  
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  
  
Summary: The FactoryTalk Linx Gateway adds a Classic OPC DA and OPC UA server  
interface to deliver information collected by FactoryTalk Linx from Logix5000aC/  
and other Allen-BradleyA(r) controllers to external OPC clients, permitting  
third-party software to coexist with FactoryTalkA(r) software.  
  
RSLinx Classic is the most widely-installed Communications software in  
automation today. All editions of RSLinx Classic deliver the ability to  
browse your automation networks, configure and diagnose network devices.  
RSLinx Classic supports a wide range of applications through a scalable  
offerings that provide both DDE and Classic OPC DA data servers to permit  
3rd party software to access information within your control system.  
  
Desc: 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.  
  
Tested on: Microsoft Windows 7 Professional SP1 (EN)  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2018-5473  
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5473.php  
  
NCCIC ID: ICSA-18-158-01  
NCCIC URL: https://ics-cert.us-cert.gov/advisories/ICSA-18-158-01  
  
CVE ID: CVE-2018-10619  
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-10619  
https://nvd.nist.gov/vuln/detail/CVE-2018-10619  
  
Bugtraq ID: 104415  
Bugtraq URL: https://www.securityfocus.com/bid/104415  
  
11.12.2017  
  
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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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