FaceTime: Heap Corruption in RTP Video Processing

( Original text )

There is a memory corruption issue when processing a malformed RTP video stream in FaceTime that leads to a kernel panic due to a corrupted heap cookie or data abort.
This bug can be reached if a user accepts a call from a malicious caller. This issue only affects FaceTime on iOS, it does not crash on a Mac. The issue can be reproduced using the attached sequence of RTP packets. To reproduce the issue: 1) Build video-replay.c in attached zip (gcc -g -dynamiclib -o mylib video-replay.c) and copy to /usr/lib/mylib 2) Use insert_dylib (https://github.com/Tyilo/insert_dylib) to add /usr/lib/mylib to AVConference (insert_dylib —strip-codesig /usr/lib/mylib AVConference) 3) Edit /System/Library/Sandbox/Profiles/com.apple.avconferenced.sb to add /out as allow file read and write 4) Restart the machine 5) Extract the attached out folder in the zip to /out and change the permissions so it’s readable by AVConference 6) Call target, when they pick up, the phone will crash This bug is subject to a 90 day disclosure deadline. After 90 days elapse or a patch has been made broadly available (whichever is earlier), the bug report will become visible to the public.

panic-full-2018-08-21-155413.ips
350 KB Download
panic-full-2018-08-21-150443.388.ips
354 KB Download
dataabort2-20180821T235200Z-001.zip
510 KB Download
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