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]

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[binary] An XNU Exploit and a Chrome Heap Overflow 33:02 Share

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[binary] An XNU Exploit and a Chrome Heap Overflow