Provadys Offsensive Security Blog

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Osquery for Windows access right misconfiguration Elevation of Privilege (CVE-2019-3567)

Published on Tue 04 June 2019 by @clavoillotte

An access right misconfiguration in Osquery for Windows can be abused to load run arbitrary programs or load arbitrary DLLs. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.

An introduction to privileged file operation abuse on Windows

Published on Wed 20 March 2019 by @clavoillotte

This is a (bit long) introduction on how to abuse file operations performed by privileged processes on Windows for local privilege escalation (user to admin/system), and a presentation of available techniques, tools and procedures to exploit these types of bugs.

F-Secure SAFE arbitrary file copy Elevation of Privilege

Published on Wed 20 March 2019 by @clavoillotte

A privileged file copy performed by SAFE when an infected file is detected can be abused to overwrite an arbitrary file. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.

McAfee Endpoint Security arbitrary file write Elevation of Privilege (CVE-2019-3582)

Published on Wed 20 March 2019 by @clavoillotte

The permissive access rights on logs and quarantine (files / folders and configuration), and the privileged file manipulation performed by McAfee Endpoint Security on these files can be abused to create or delete arbitrary files, or to create arbitrary registry keys. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.

Pulse Secure client arbitrary file write Elevation of Privilege (CVE-2018-11002)

Published on Wed 20 March 2019 by @clavoillotte

The permissive access rights on log folder, files and shared memory section, as set by the Pulse Secure client’s logging service, can be abused to create arbitrary files with write access. This can be used by an unprivileged user to obtain SYSTEM privileges on the local machine.

SANS Christmas Challenge 2018

Published on Mon 14 January 2019 by Yannick Méheut

🎵 I'm dreaming of a pwned Christmaaaaas 🎵 As usual, here's my write-up for the 2018 SANS Christmas Challenge.

SANS Christmas Challenge 2017

Published on Wed 10 January 2018 by Yannick Méheut

'Tis the season to be pwning, falalalala lalalala. Each year, the SANS team publishes a Christmas Challenge against which anyone can test their skills. This year was no exception, and here's our write-up for the 2017 SANS Christmas Challenge.

UAC bypass via elevated .NET applications

Published on Fri 15 September 2017 by @clavoillotte

.NET Framework can be made to load a profiling DLL or a COM component DLL via user-defined environment variables and CLSID registry entries, even when the process is elevated. This behavior can be exploited to bypass UAC in default settings on Windows 7 to 10 (including the latest RS3 builds) by making an auto-elevate .NET process (such as MMC snap-ins) load an arbitrary DLL.