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Introducción Primero de todo, este no es un write-up completo. Describiré mi exploit para lograr la flag en la segunda parte del reto de Futurama 3 de este mes de la UAM. Se considera el reversing del binario “carl” ya completado y las respectivas vulnerabilidades encontradas para provocar el Buffer Overflow. […] The binary I was presented with an ELF32 binary with the following protections: ch77 protections Disassembling the binary with r2, I quickly recognized a classic stack overflow by abusing the call to read: There’s a buffer overflow in the read function.
El reto Revisamos la información básica sobre el binario: file go4fun.uu go4fun.uu: ELF 32-bit MSB executable, MIPS, MIPS32 version 1 (SYSV), statically linked, not stripped Estamos ante un binario ELF (Linux), con arquitectura MIPS de 32 bits. Además, es Big Endian (MSB). Ejecutando el binario con arm_now
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Wednesday, 22nd of April 2020 | Category: