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CVE-2021-33739 is an elevation of privilege vulnerability in the Microsoft Desktop Window Manager (DWM) Core Library. The flaw allows a local attacker to gain SYSTEM privileges by exploiting improper handling of objects in the DWM Core Library. This vulnerability was actively exploited as a zero-day and is linked to targeted attacks, potentially by the BITTER APT group.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a Visual Studio C++ project implementing a local privilege escalation (LPE) exploit for Microsoft Windows, targeting CVE-2021-26868 and CVE-2021-33739. The main exploit logic resides in 'exp.cpp', which interacts with Windows kernel structures and the Desktop Composition (DComposition) subsystem to manipulate kernel memory and escalate privileges. The exploit loads 'ntdll.dll' to resolve internal Windows API functions and ultimately injects code into the 'winlogon.exe' process to achieve SYSTEM privileges. The project includes standard Visual Studio solution and project files, with the exploit code as the primary component. The exploit must be run locally on a vulnerable Windows system and is a proof-of-concept (POC) for the referenced CVEs. No network or remote attack vector is present; the attack is purely local. The endpoints of interest are the use of 'ntdll.dll' and the targeting of 'winlogon.exe' for code injection.
This repository contains a functional proof-of-concept (PoC) exploit for CVE-2021-33739, a local privilege escalation vulnerability in Microsoft Windows. The exploit is implemented in C++ (exp.cpp) and leverages a Use-After-Free (UAF) in the Desktop Window Manager (DWM) through the DComposition API. The code interacts directly with native Windows APIs, including ntdll.dll, and manipulates kernel objects to achieve arbitrary code execution in the context of the Winlogon process. The exploit ultimately injects shellcode into Winlogon, resulting in SYSTEM-level privileges. The README is minimal and points to the original resource. The code is operational and demonstrates a full local privilege escalation chain, but is not weaponized for mass exploitation. No network endpoints are present; the attack vector is strictly local. The main fingerprintable endpoints are the use of ntdll.dll, the Winlogon process (target for injection), and dwm.exe (targeted for exploitation via ALPC and DComposition).
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1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
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