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CVE-2021-30883
On 11 October 2021, Apple released iOS 15.0.2 with a fix for CVE-2021-30883, a vulnerability in IOMobileFrameBuffer which allows kernel code execution, and has been exploited in the wild according to Apple. Note that is is not the same as CVE-2021-30807 which was fixed in 14.7.1.
Saar Amar quickly bindiff'd the kernel and wrote a blog post and PoC about this vulnerability.
Unlike CVE-2021-30807, this vulnerability is apparently exploitable from the app sandbox without any special entitlement.
Saar's PoC only works on A10–A13 devices. Apparently, iOS 15 on A14/A15 moved this code to the DCP[1]. A small change to the PoC causes the DCP coprocessor to panic, which then panics the iOS kernel, but this is unlikely to allow exploiting the kernel.
(TODO: what about iOS14 on A14?)
References
- ^ Tweet from Adam Donenfeld (Zimperium): This has been moved to the display coprocessor (DCP) starting from 15, at least on iPhone 12 (and most probably other ones as well)
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