Adversaries may execute their own malicious payloads by hijacking vulnerable file path references. Adversaries can take advantage of paths that lack surrounding quotations by placing an executable in a higher level directory within the path, so that Windows will choose the adversary's executable to launch.
Service paths[1] and shortcut paths may also be vulnerable to path interception if the path has one or more spaces and is not surrounded by quotation marks (e.g., C:\unsafe path with space\program.exe vs. "C:\safe path with space\program.exe").[2] (stored in Windows Registry keys) An adversary can place an executable in a higher level directory of the path, and Windows will resolve that executable instead of the intended executable. For example, if the path in a shortcut is C:\program files\myapp.exe, an adversary may create a program at C:\program.exe that will be run instead of the intended program.[3],[4]
This technique can be used for persistence if executables are called on a regular basis, as well as privilege escalation if intercepted executables are started by a higher privileged process.
References
- Microsoft. (2017, April 20). HKLM\SYSTEM\CurrentControlSet\Services Registry Tree. Retrieved March 16, 2020.
- Mark Baggett. (2012, November 8). Help eliminate unquoted path vulnerabilities. Retrieved November 8, 2012.
- HackHappy. (2018, April 23). Windows Privilege Escalation – Unquoted Services. Retrieved August 10, 2018.
- absolomb. (2018, January 26). Windows Privilege Escalation Guide. Retrieved August 10, 2018.
Incidencias vinculadas
- MITREATTACK -
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