lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 27 Mar 2020 23:25:50 +0000
From: Paul Szabo <>
To: Stefan Kanthak <>, ""
Cc: "" <>
Subject: Re: [FD] Defense in depth -- the Microsoft way (part 64): Windows
 Defender loads and exeutes arbitrary DLLs

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

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
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 to learn more.

Sent through the Full Disclosure mailing list
Web Archives & RSS:

Powered by blists - more mailing lists