My theory on how the webp 0day was discovered #short
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I have spent many hours looking at the webp vulnerability used in the 0day attack against iPhones. In the past videos we have seen why fuzzers have a hard time finding the issue, so I wanted to understand how this was discovered. And I think I have a good theory!
Part 1: Huffman Tables • A Vulnerability to Hack The World - C...
Part 2: Fuzzing libwebp • Finding The .webp Vulnerability in 8s...
Sources:
https://citizenlab.ca/2023/09/blastpass-nso-group-iphone-zero-click-zero-day-exploit-captured-in-the-wild/
https://googleprojectzero.blogspot.com/2019/08/the-fully-remote-attack-surface-of.html
https://googleprojectzero.blogspot.com/2020/01/remote-iphone-exploitation-part-1.html
https://googleprojectzero.blogspot.com/2021/01/a-look-at-imessage-in-ios-14.html
https://github.com/seemoo-lab/frida-scripts/blob/main/scripts/libdispatch.js
https://googleprojectzero.blogspot.com/2021/12/a-deep-dive-into-nso-zero-click.html
https://citizenlab.ca/2023/04/nso-groups-pegasus-spyware-returns-in-2022/
https://googleprojectzero.blogspot.com/2021/12/a-deep-dive-into-nso-zero-click.html
https://github.com/libjxl/libjxl/blob/4b9dbde293f7f282b6952a02340300abfca2b184/lib/jxl/huffman_table.cc#L51
https://github.com/webmproject/libwebp/blob/7861947813b7ea02198f5d0b46afa5d987b797ae/src/dec/vp8l_dec.c#L86C3-L86C76
https://github.com/Tencent/mars/blob/9ab46e19ed3d4fcafe9d0de4b36547321f5ead83/mars/comm/windows/zlib/inftrees.h#L41
https://github.com/google/brunsli/blob/master/c/enc/jpeg_huffman_decode.h#L20
00:00 - Intro
01:18 - The iPhone Remote Attack Surface
02:49 - Targeting iMessage
04:04 - Dangerous Parsing / BlastDoor
06:53 - Image I/O and libwebp
08:11 - A Pattern of Image Vulnerabilities
09:28 - Huffman Tables are Everywhere!
10:50 - My Theory: known issue with enough.c
13:50 - Outro
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