CVE-2021-30883

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Revision as of 23:14, 11 October 2021 by Nicolas17 (talk | contribs) (Add info about A14/DCP)
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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 A10A13 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

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