A vulnerability exists within win32k that can be leveraged by an attacker to escalate privileges to those of NT AUTHORITY\SYSTEM. The flaw exists in how the WndExtra field of a window can be manipulated into being treated as an offset despite being populated by an attacker-controlled value. This can be leveraged to achieve an out of bounds write operation, eventually leading to privilege escalation. This flaw was originally identified as CVE-2021-1732 and was patched by Microsoft on February 9th, 2021. In early 2022, a technique to bypass the patch was identified and assigned CVE-2022-21882. The root cause is is the same for both vulnerabilities. This exploit combines the patch bypass with the original exploit to function on a wider range of Windows 10 targets.
9902434a58e36c7838c71ee860592d8624368fc1b380cf4c9ccf530f09895fd2A use after free vulnerability exists in the NtGdiResetDC() function of Win32k which can be leveraged by an attacker to escalate privileges to those of NT AUTHORITY\SYSTEM. The flaw exists due to the fact that this function calls hdcOpenDCW(), which performs a user mode callback. During this callback, attackers can call the NtGdiResetDC() function again with the same handle as before, which will result in the PDC object that is referenced by this handle being freed. The attacker can then replace the memory referenced by the handle with their own object, before passing execution back to the original NtGdiResetDC() call, which will now use the attacker's object without appropriate validation. This can then allow the attacker to manipulate the state of the kernel and, together with additional exploitation techniques, gain code execution as NT AUTHORITY\SYSTEM. This Metasploit module has been tested to work on Windows 10 x64 RS1 (build 14393) and RS5 (build 17763), however previous versions of Windows 10 will likely also work.
d461ac15b5e26e34c254c715db3521b7fe5d55e6fa9001b97d36ac89cbec7782A vulnerability exists within win32k that can be leveraged by an attacker to escalate privileges to those of NT AUTHORITY\SYSTEM. The flaw exists in how the WndExtra field of a window can be manipulated into being treated as an offset despite being populated by an attacker-controlled value. This can be leveraged to achieve an out of bounds write operation, eventually leading to privilege escalation.
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