Pwnhack.com - Mayhem

This write-up covers the Mayhem challenge from Pwnhack.com, focusing on a classic buffer overflow vulnerability. The goal is to redirect execution to a hidden win() function by overwriting the return address on the stack. 1. Initial Analysis

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Try Mayhem. Point it at your hardest binary. Watch it find what you couldn’t. This write-up covers the Mayhem challenge from Pwnhack

Disclaimer: This report is for informational purposes only. Accessing sites like Pwnhack.com can expose users to legal liability and malware infection. Initial Analysis , "Mayhem" isn't just a catchy

We need to find exactly how many bytes are required to reach the Instruction Pointer (EIP/RIP). Generate a cyclic pattern using pattern create 100. Run the binary in gdb and input the pattern. After the crash, check the address in the register. Offset found: 72 bytes. 4. Crafting the Exploit

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PIE: Disabled (the win() function address remains constant). 2. Identifying the Vulnerability