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Ancillary Function Driver (AFD) For Winsock Privilege Escalation

Posted Mar 30, 2023

Authored by Christophe de la Fuente, b33f, Yarden Shafir, chompie | Site metasploit.com

A vulnerability exists in the Windows Ancillary Function Driver for Winsock (afd.sys) can be leveraged by an attacker to escalate privileges to those of NT AUTHORITY\SYSTEM. Due to a flaw in AfdNotifyRemoveIoCompletion, it is possible to create an arbitrary kernel Write-Where primitive, which can be used to manipulate internal I/O ring structures and achieve local privilege escalation. This exploit only supports Windows 11 22H2 up to build 22621.963 (patched in January 2023 updates).

tags | exploit, arbitrary, kernel, local

systems | windows

advisories | CVE-2023-21768

SHA-256 | d5a189a643f3c07d66a853b96018a65f135901780840ff23dc17f6a405330ebb

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