Automated Logic WebCTRL 6.5 Insecure File Permissions Privilege Escalation

2017.08.23
Risk: Low
Local: Yes
Remote: No
CWE: CWE-264


CVSS Base Score: 6.9/10
Impact Subscore: 10/10
Exploitability Subscore: 3.4/10
Exploit range: Local
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

Automated Logic WebCTRL 6.5 Insecure File Permissions Privilege Escalation Vendor: Automated Logic Corporation Product web page: http://www.automatedlogic.com Affected version: ALC WebCTRL, i-Vu, SiteScan Web 6.5 and prior ALC WebCTRL, SiteScan Web 6.1 and prior ALC WebCTRL, i-Vu 6.0 and prior ALC WebCTRL, i-Vu, SiteScan Web 5.5 and prior ALC WebCTRL, i-Vu, SiteScan Web 5.2 and prior Summary: WebCTRLA(r), Automated Logic's web-based building automation system, is known for its intuitive user interface and powerful integration capabilities. It allows building operators to optimize and manage all of their building systems - including HVAC, lighting, fire, elevators, and security - all within a single HVAC controls platform. It's everything they need to keep occupants comfortable, manage energy conservation measures, identify key operational problems, and validate the results. Desc: WebCTRL server/service suffers from an elevation of privileges vulnerability which can be used by a simple authenticated user that can change the executable file with a binary of choice. The vulnerability exist due to the improper permissions, with the 'M' flag (Modify) or 'C' flag (Change) for 'Authenticated Users' group. The application suffers from an unquoted search path issue as well impacting the service 'WebCTRL Service' for Windows deployed as part of WebCTRL server solution. 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-2017-5429 Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5429.php CVE ID: CVE-2017-9644 CVE URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9644 30.01.2017 --- sc qc "WebCTRL Service" [SC] QueryServiceConfig SUCCESS SERVICE_NAME: Webctrl Service TYPE : 20 WIN32_SHARE_PROCESS START_TYPE : 2 AUTO_START ERROR_CONTROL : 1 NORMAL BINARY_PATH_NAME : C:\WebCTRL6.0\WebCTRL Service.exe -run LOAD_ORDER_GROUP : TAG : 0 DISPLAY_NAME : WebCTRL Service 6.0 DEPENDENCIES : SERVICE_START_NAME : LocalSystem cacls "C:\WebCTRL6.0\WebCTRL Service.exe" C:\WebCTRL6.0\WebCTRL Service.exe BUILTIN\Administrators:(ID)F NT AUTHORITY\SYSTEM:(ID)F BUILTIN\Users:(ID)R NT AUTHORITY\Authenticated Users:(ID)C cacls "C:\WebCTRL6.0\WebCTRL Server.exe" C:\WebCTRL6.0\WebCTRL Server.exe BUILTIN\Administrators:(ID)F NT AUTHORITY\SYSTEM:(ID)F BUILTIN\Users:(ID)R NT AUTHORITY\Authenticated Users:(ID)C

References:

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5429.php


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