Full Disclosure mailing list archives
Re: Defense in depth -- the Microsoft way (part 64): Windows Defender loads and exeutes arbitrary DLLs
From: Paul Szabo <paul.szabo () sydney edu au>
Date: Fri, 27 Mar 2020 23:25:50 +0000
Does this mean that unprivileged users can defeat WindowsDefender, even when that is "enforced" by managers? Surely that would be a vulnerability! I am not knowledgeable about Windows management, but the pages https://docs.microsoft.com/en-us/configmgr/protect/deploy-use/endpoint-protection https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-antivirus/configuration-management-reference-windows-defender-antivirus suggest that enforcement of WindowsDefender is a supported feature. Thanks, Paul On 2020-03-27 15:27, Stefan Kanthak wrote:
in September 2017, Microsoft relocated many executable files of Windows Defender from the directory "%ProgramFiles%\Windows Defender\" to "%ProgramData%\Microsoft\Windows Defender\platform\<version>\" ... Of special interest here is the IOfficeAntiVirus implementation ... This interface is called by the attachment manager ... "Thanks" to the environment variable specified in the registered path "%ProgramData%\Microsoft\Windows Defender\platform\<version>\MpOav.dll", an unprivileged user/attacker can provide an arbitrary DLL which is then loaded and executed ... ... Vendor statement: The MSRC assigned case 57439 to the above report, and replied with the following statements: | After investigation, our engineers have determine this this behavior | is by-design and does not constitute as a vulnerability as reported. ...
-- Paul Szabo psz () maths usyd edu au www.maths.usyd.edu.au/u/psz School of Mathematics and Statistics University of Sydney Australia I support NTEU members taking a stand for workplace rights in the face of poorly-run change management. Visit www.nteu.org.au/sydney to learn more. _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
Current thread:
- Defense in depth -- the Microsoft way (part 64): Windows Defender loads and exeutes arbitrary DLLs Stefan Kanthak (Mar 27)
- Re: Defense in depth -- the Microsoft way (part 64): Windows Defender loads and exeutes arbitrary DLLs Paul Szabo (Mar 31)