Yet another wonderful day for privilege elevation in MacOS Xhttps://twitter.com/wdormann/status/953651214532726789 …
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Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.
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Greg Linares Retweeted Will Dormann
Yet another wonderful day for privilege elevation in MacOS Xhttps://twitter.com/wdormann/status/953651214532726789 …
Greg Linares added,
I don't think it's a privilege escalation, as far as I can tell. "Approval" of a kernel module is a different thing from the actual load attempt. The latter of which requires admin privileges. See https://developer.apple.com/library/content/technotes/tn2459/_index.html …
There is a part of that document that has me going "ORLY":pic.twitter.com/BCc85UbFAm
Also applies to names on certificates supplied by red teams / State sponsored attackers / and signed Malware ;)pic.twitter.com/HBilpTsI49
So correct me if im wrong but: - Trojanize or monitor for valid KEXT bundle - Drop evil KEXT in appropriate sub directories w/ spoofed cert - Wait for legit KEXT to be approved - Evil KEXT is loaded
Even if the attacker could get a KEXT into one of the appropriate subdirs, I still think that an evil KEXT would need to be *loaded* by an admin. I think the language in your screenshot is meant to convey that you don't need to individually approve each KEXT by the same signer.
That makes sense. I would assume and hope that is the case...
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