Finding BUGS in TypeScript code using Fuzzing (jsfuzz) - Javascript Security #2

Today, I will use jsfuzz to find unhandled exceptions inside a famous TypeScript library (chrono-node). This library is a perfect kind of target for fuzzing since it's parsing data and the APIs are simple. I will first explain which API we will fuzz, then how to create a fuzzing harness, trigger some bugs and finally show you how to easily debug the crashes.

#Fuzzing #TypeScript #jsfuzz

00:00 Intro
00:52 Target: chrono-node
02:52 Fuzzer: jsfuzz
03:18 Target's API: parseDate / parse
04:22 Create a fuzzing harness
06:07 Run the fuzzer
09:00 Improve the corpora
11:32 Create a minimal crash reproducer
13:57 Understanding better the API's code
15:52 Improve the fuzzer
17:16 Find a new bug

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Keyword: Fuzzing, Fuzz Testing, TypeScript, TS, JavaScript, JS, jsfuzz