facetime rtp video processing heap corruption

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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


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/45786.zip

Facetime rtp video processing heap corruption Vulnerability / Exploit Source : Facetime rtp video processing heap corruption

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