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First Active2022-04-11
Last Active2022-04-11
Windows User Profile Service Privlege Escalation
Posted Apr 11, 2022
Authored by Grant Willcox, KLINIX5 | Site metasploit.com

The user profile service, identified as ProfSrv, is vulnerable to a local privilege elevation vulnerability in its CreateDirectoryJunction() function due to a lack of appropriate checks on the directory structure of the junctions it tries to link together. Attackers can leverage this vulnerability to plant a malicious DLL in a system directory and then trigger a UAC prompt to cause this DLL to be loaded and executed by ProfSrv as the NT AUTHORITY\SYSTEM user. Note that this bug was originally identified as CVE-2021-34484 and was subsequently patched a second time as CVE-2022-21919, however both patches were found to be insufficient. This bug is a patch bypass for CVE-2022-21919 and at the time of publishing, has not yet been patched, though plans are in place to patch it as CVE-2022-26904.

systems | windows
advisories | CVE-2021-34484, CVE-2022-21919, CVE-2022-26904
SHA-256 | d30eae074af8b00dd694a057dd1c7a07694de0851d5e48da9ee462ed23d2a3ce
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