PWN

This challenge involves exploiting buffer overflow and format string vulnerabilities. The buffer overflow allows us to leverage the format string %s to leak addresses. Additionally, this challenge includes a return-to-libc (ret2libc) attack. Intial Analysis In this challenge we were given 4 different files. yawa (challenge executable) yawa.c (challenge source code) ld-2.35.so (dynamic linker/loader for the GNU C Library version 2.35) libc.so.6 (main shared library for the GNU C Library) When initially received executable, yawa cannot be run due the executable requirements using specific linker and main shared library. Using pwninit (https://github.com/io12/pwninit), the patching process becomes much easier. Now with the patched binary, it can now be run. ...

This security challenge focuses on exploiting a buffer overflow vulnerability within a provided program file. Using knowledge on Linux calling conventions and Return Oriented Programming (ROP) to achieve the exploit. The ultimate goal is to perform a Ret-2-libC attack without access to the exact LibC library file used by the program. Question Welcome to Lib-Riddle, where the library holds a secret deep inside its stacks. In this hilarious and intriguing challenge, you’ll sift through piles of books and quirky clues to uncover the hidden mystery. Can you crack the code and reveal the library’s best-kept secret? Dive in and let the quest for knowledge begin! ...