Pwnable.kr Passcode Walk-though

Here is a walk-through of the passcode challenge on Pwnable.kr.

EB (JMP)

Unconditional jump. Can be used to overwrite a conditional jump to ensure that the jump always happens.

• Reverse Engineering for Beginners
• Reverse Engineering Challenges
• Ioli Crackmes
• Crackmes.de Archive
• 0x00sec
• Skidophrenia

Compiling C Programs with GCC

On 64-bit Linux, GCC compiles a C program by default to a 64-bit ELF executable. To compile as 32-bit, you first need the GCC multilib support package. For example: