How SUDO on Linux was HACKED // CVE-2021-3156

The most comprehensive video covering the sudo vulnerability CVE-2021-3156 Baron Samedit. I spent two weeks on rediscovering, analysing and exploitation of the sudoedit heap overflow. We will talk about fuzzing, code review, exploit strategies, heap feng shui and developing the exploit. https://liveoverflow.com/support Article: https://liveoverflow.com/critical-sudo-vulnerability-walkthrough-cve-2021-3156/ Binary Exploitation Playlist: /playlist/PLhixgUqwRTjxglIswKp9mpkfPNfHkzyeN PwnFunction's Binary Exploitation Playlist: /playlist/PLI_rLWXMqpSkAYfar0HRA7lykydwmRY_2 Full CVE-2021-3156 Advisory: https://packetstormsecurity.com/files/161160/Sudo-Heap-Based-Buffer-Overflow.html Qualys Blog: https://blog.qualys.com/vulnerabilities-research/2021/01/26/cve-2021-3156-heap-based-buffer-overflow-in-sudo-baron-samedit milek7's blog on fuzzing sudo: https://milek7.pl/howlongsudofuzz/ 00:00 - Intro and Motivation 01:33 - afl: Fuzzing argv[] 03:22 - afl: sudo vs. sudoedit 04:27 - afl: Fuzzing setuid Process 06:49 - Fuzzing Conclusion 07:11 - Code Review: Identify Risky Code Through Isolation 09:39 - Code Review: Bypass Safe Conditions 11:15 - Exploit Strategy: Modern Mitigations 12:25 - The service_user Object Overwrite Technique 13:48 - Heap Feng Shui via Environment Variables 14:57 - Bruteforce Script to Find Exploitable Conditions 15:39 - Find and Analyse Useful Crashes 16:31 - Exploitability Analysis Conclusion 17:13 - Qualys Researchers Knew nss From Stack Clash 17:47 - Sudoedit Exploitable on macOs? 18:32 - Research Conclusion 19:27 - Outro -=[ ❤️ Support ]=- → per Video: https://www.patreon.com/join/liveoverflow → per Month: /channel/UClcE-kVhqyiHCcjYwcpfj9w/join -=[ 🐕 Social ]=- → Twitter: https://twitter.com/LiveOverflow/ → Website: https://liveoverflow.com/ → Subreddit: https://www.reddit.com/r/LiveOverflow/ → Facebook: https://www.facebook.com/LiveOverflow/

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