[binary] An XNU Exploit and a Chrome Heap Overflow

First, we take a look at some positive changes to OSS Fuzz, then we dive into some vulnerabilities. This includes an XNU heap out-of-bounds write vulnerability, a Chrome heap-based overflow vulnerability, and an out-of-bounds read in cmark-gfm that, while probably not exploitable, is still intriguing. Links and vulnerability summaries for this episode are available at: https://dayzerosec.com/podcast/186.html [00:00:00] Introduction [00:00:22] Spot the Vuln - The Great String Escape [00:03:03] Taking the next step: OSS-Fuzz in 2023 [00:09:48] XNU Heap Underwrite in dlil.c [CVE-2023-23504] [00:19:10] Chrome heap buffer overflow in validating command decoder [CVE-2022-4135] [00:26:19] Out-of-bounds read in cmark-gfm [CVE-2023-22485] The DAY[0] Podcast episodes are streamed live on Twitch twice a week:  -- Mondays at 3:00pm Eastern (Boston) we focus on web and more bug bounty style vulnerabilities  -- Tuesdays at 7:00pm Eastern (Boston) we focus on lower-level vulnerabilities  and exploits. We are also available on the usual podcast platforms:  -- Apple Podcasts: https://podcasts.apple.com/us/podcast/id1484046063  -- Spotify: https://open.spotify.com/show/4NKCxk8aPEuEFuHsEQ9Tdt  -- Google Podcasts: https://www.google.com/podcasts?feed=aHR0cHM6Ly9hbmNob3IuZm0vcy9hMTIxYTI0L3BvZGNhc3QvcnNz  -- Other audio platforms can be found at https://anchor.fm/dayzerosec You can also join our discord: https://discord.gg/daTxTK9