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First Active2022-02-28
Last Active2022-02-28
Win32k ConsoleControl Offset Confusion / Privilege Escalation
Posted Feb 28, 2022
Authored by Spencer McIntyre, BITTER APT, LiHao, KaLendsi, MaDongZe, TuXiaoYi, JinQuan, L4ys | Site metasploit.com

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.

tags | exploit, root, vulnerability
systems | windows
advisories | CVE-2021-1732, CVE-2022-21882
SHA-256 | 9902434a58e36c7838c71ee860592d8624368fc1b380cf4c9ccf530f09895fd2
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