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macOS cfprefsd Arbitrary File Write / Local Privilege Escalation

Posted Sep 7, 2020

Authored by timwr, Insu Yun, Taesoo Kim, Jungwon Lim, Yonghwi Jin | Site metasploit.com

This Metasploit module exploits an arbitrary file write in cfprefsd on macOS versions 10.15.4 and below in order to run a payload as root. The CFPreferencesSetAppValue function, which is reachable from most unsandboxed processes, can be exploited with a race condition in order to overwrite an arbitrary file as root. By overwriting /etc/pam.d/login a user can then login as root with the login root command without a password.

tags | exploit, arbitrary, root

advisories | CVE-2020-9839

SHA-256 | 931484ae445d7eeffdc56096c8dbc47f24916e5073c7902aafc42973e228e845

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