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.
9902434a58e36c7838c71ee860592d8624368fc1b380cf4c9ccf530f09895fd2Whitepaper called Windows Win32k Elevation of Privilege Vulnerability. It details exploitation and an overview of CVE-2021-1732.
a9380503b2a681de62499f1daeafb145966439dc2c08d757cb57d440409aaee2A 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.
ed073b3c17d4f49ffa13834abab3bf326257f8e012a4c37b26486bc312e9e80d
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