iOS 11.4 patched kernel memory corruption bugs I reported in two distinct areas: mptcp and vfs. My exploit for the mptcp bug is here: https://bugs.chromium.org/p/project-zero/issues/detail?id=1558 … Please read the README. It requires an Apple developer cert.
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That is the same bug as already publicly documented from the patch by
@elvanderb and exploited by@jaakerblom, see John's repo here:https://github.com/potmdehex/multipath_kfree …86 proslijeđenih tweetova 454 korisnika označavaju da im se sviđaPrikaži ovu nit -
The vfs bug doesn't require an Apple developer cert but is considerably harder to exploit. You get to write 8 NULL bytes off the end of a kalloc.16 buffer. It's sufficiently hard to exploit that it's worth trying just to demonstrate that such issues are reliably exploitable...
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see eg The Poisoned Nul Byte, 2014 by
@scarybeasts https://googleprojectzero.blogspot.com/2014/08/the-poisoned-nul-byte-2014-edition.html … . But it takes time. The mptcp exploit is mostly recycled bits of earlier exploits. The getvolattrlist bug needs some new techniques.83 proslijeđena tweeta 468 korisnika označava da im se sviđaPrikaži ovu nit -
The trigger is here: https://bugs.chromium.org/p/project-zero/issues/detail?id=1564 … If you're in to iOS exploit dev take a go at it and blog about it! I'll publish what I have soon, hopefully this week.
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Finally: always keep your personal iOS devices up to date and only use these tools on devices which don't have any personal information and are only used for research.
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(footnote: for the vfs bug technically you can control a handful of bits in the 8 overflow bytes, the overflow value is actually two 4 byte flag fields. This may or may not help.)
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