My theory on how the webp 0day was discovered (BLASTPASS)

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! LEARN ON HEXTREE (ad) Learn hacking on Hextree: https://www.hextree.io/ Join the Hextree Discord: https://discord.gg/xgQpCQCpvy Part 1: Huffman Tables https://youtu.be/lAyhKaclsPM Part 2: Fuzzing libwebp https://youtu.be/PJLWlmp8CDM 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://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 CHAPTERS 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 SUPPORT Per video: https://www.patreon.com/join/liveoverflow Per month: https://www.youtube.com/channel/UClcE-kVhqyiHCcjYwcpfj9w/join Buy my handwriting font (ad): https://shop.liveoverflow.com/ WATCH, FOLLOW & READ Second channel: https://www.youtube.com/LiveUnderflow Twitch: https://twitch.tv/LiveOverflow/ Twitter: https://twitter.com/LiveOverflow/ Instagram: https://instagram.com/LiveOverflow/ TikTok: https://www.tiktok.com/@liveoverflow_ LiveOverflow blog: https://liveoverflow.com/ Hextree blog (ad): https://www.hextree.io/blog #SecurityResearch #iOS #LiveOverflow (ad) LiveOverflow YouTube channel is supported by advertisement and product placement.