2022-02-24

[public] 7.09K views, 3.80K likes, dislikes audio only

LiveOverflow

This was a hard web CTF challenge involving a JSP file upload with very restricted character sets. We had to use the Expression Language (EL) to construct useful primitives and upload an ascii-only .jar file.

Alternative writeups: https://github.com/voidfyoo/rwctf-4th-desperate-cat/tree/main/writeup

Fuzzing log4j with Jazzer: /youtube/video/kvREvOvSWt4

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