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[FD] Easy FTP Pro v4.2 iOS - Command Inject Vulnerabilities
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Easy FTP Pro v4.2 iOS - Command Inject Vulnerabilities
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 07 Aug 2014 17:46:50 +0200
Document Title:
===============
Easy FTP Pro v4.2 iOS - Command Inject Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1291
Release Date:
=============
2014-08-06
Vulnerability Laboratory ID (VL-ID):
====================================
1291
Common Vulnerability Scoring System:
====================================
5.7
Product & Service Introduction:
===============================
The Best FTP and SFTP client for iPhone and iPad! Easy FTP is an FTP (File
Transfer Protocol) and SFTP client for
iPhone/iPod Touch. Easy FTP offer all the features of a desktop client. Also
includes a web browser that allow to
download files, audio player, mp4, avi,... video player, Dropbox, also helps
you to access files on your remote
computer (Mac, Windows, Linux), NAS Servers, and more.
( Copy of the Homepage:
https://itunes.apple.com/en/app/easy-ftp-pro/id429071149 )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered two command injection web
vulnerabilities in the official Easy FTP Pro v4.2 iOS mobile application.
Vulnerability Disclosure Timeline:
==================================
2014-08-06: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Juan Ramon Rivero
Product: Easy FTP Pro - iOS Mobile Web Application 4.2
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
Two local command inject web vulnerabilities has been discovered in the
official Easy FTP Pro v4.2 iOS mobile application.
The vulnerability allows remote attackers to inject own commands by usage of
misconfigured stored system/device values to
compromise the apple mobile iOS application.
The first vulnerability is located in the vulnerable `foldername` value of the
`easy ftp wifi` module. Local attackers are
able to inject own malicious system specific commands or path value requests in
the vulnerable `foldername` input value.
The execution of the command occurs in the `File Dir Index Listing` module of
the easy ftp pro v4.2 mobile application.
The attacker is able to manipulate the local device values with physical or
restricted acccess to compromise the mobile
application by preparing to change the foldername. The encoding of the
vulnerable values in the `File Dir Index Listing`
module is broken.
The second vulnerability is also located in the `èasy ftp wifi` module. The
same attack like on changing a foldername can
be exploited by attacker through the regular filename validation. The attacker
is able to manipulate the local device values
with physical or restricted acccess to compromise the mobile application by
preparing to change the filename.
The attack vector is located on the application-side and the injection requires
physical device access or a local low
privileged device user account. Local attackers are also able to exploit the
albumname validation issue in combination
with persistent injected script codes.
The security risk of the local command/path inject vulnerability is estimated
as medium with a cvss (common vulnerability
scoring system) count of 5.7. Exploitation of the command/path inject
vulnerability requires a low privileged iOS device
account with restricted access and no user interaction. Successful exploitation
of the vulnerability results in unauthorized
execution of system specific commands and unauthorized path value requests to
compromise the mobile iOS application or the
connected device components.
Request Method(s):
[+] [Sync]
Vulnerable Module(s):
[+] Add File & Rename File + Import
[+] Add Folder & Rename Folder + Import
Vulnerable Parameter(s):
[+] foldername
[+] filename
Affected Module(s):
[+] File Dir Index Listing
Proof of Concept (PoC):
=======================
The local command inject web vulnerabilities can be exploited by local
attackers with low privileged or restricted device user account
with physical access and without user interaction. For security demonstration
or to reproduce the vulnerability follow the provided
information and steps below to continue.
PoC #1:
--- PoC Session Logs [GET] (Execution) ---
Status: pending[]
GET http://localhost:8080/[LOCAL COMMAND INJECT VULNERABILITY!] Load
Flags[VALIDATE_ALWAYS ] Größe des Inhalts[unknown] Mime Type[unknown]
Request Header:
Host[localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101
Firefox/31.0]
Accept[image/png,image/*;q=0.8,*/*;q=0.5]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://localhost:8080/]
12:26:56.763[0ms][total 0ms]
Status: 200[OK]
GET http://localhost:8080/index Load Flags[LOAD_DOCUMENT_URI ] Größe des
Inhalts[unknown] Mime Type[unknown]
Request Header:
Host[localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101
Firefox/31.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://localhost:8080/]
12:27:11.166[0ms][total 0ms] Status: Aus dem Cache geladen[Aus dem Cache
geladen]
GET http://localhost:8080/# Load Flags[LOAD_FROM_CACHE ] Größe des Inhalts[-1]
Mime Type[unbekannt]
Request Header:
Host[localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101
Firefox/31.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
PoC: Source Foldername - File Dir Index Listing
<script type="text/javascript" charset="utf-8">
function eliminaArchivo(archNombre){
$.post("/delete/"+archNombre,
function(data) {
cargaLista(rutaActual);
});
}
function comprueba(){
var fullPath = document.getElementById('uploadFile').value;
if (fullPath) {
var startIndex = (fullPath.indexOf('\\') >= 0 ?
fullPath.lastIndexOf('\\') : fullPath.lastIndexOf('/'));
var filename = fullPath.substring(startIndex);
if (filename.indexOf('\\') === 0 ||
filename.indexOf('/') === 0) {
filename = filename.substring(1);
}
filenombre = filename;
}
return true;
}
var rutaActual = '';
function confirma(nombre){
var borrar = confirm("Do you really want to delete:
"+unescape(nombre)+"?");
if (borrar == true){
//return true;
eliminaArchivo(nombre);
}
return false;
}
function cargaLista(ruta){
$("#filelist").empty();
$("#folder").empty();
var send = ruta;
if(ruta == '..'){
if(rutaActual.lastIndexOf('/')>=0)
send = rutaActual.substr(0,rutaActual.lastIndexOf('/'));
else
send = '';
}
$.ajaxSetup({cache: false});
$.getJSON('/files/'+send/*'/files/'+ruta*/,
function(data){
var shadow = false;
//console.log(data);
rutaActual = data.currentDir;
$('#folder').append('Current path: Documents/'
+data.currentDir);
$.each(data.files, function(i,item){
var trclass='';
if (shadow)
trclass= " class='shadow'";
encodeName =
(encodeURI(rutaActual)+'/'+item.name).replace("'", "'");
var html = '';
if(item.type == 'FILE')
html += "<tr" + trclass + "><td class='icon'> </td><td class='filename'><a
href='/files/" + encodeName + "' class='file'>" +
decodeURI(item.name) + "</a></td>" + "<td class='size'>" + item.tam +
"</td>";else
html += "<tr" + trclass + "><td class='icon'><img src=\"folder.png\"
alt=\"folder\" height=20 width=20 /></td><td class='filename'>
<a href='javascript:cargaLista(\"" + encodeURI(item.path).replace("'", "'") +
"\")' class='file'>" + decodeURI(item.name) + "</a></td>"+"<td class='size'>
</td>";
html += "<td class='date'>" + item.date + "</td>" +
"<td class='del'><a href='#'
onclick='confirma(\""+escape(decodeURI(encodeURI(rutaActual)+'/'+item.name)).replace("'",
"'")+"\")'><img src=\"delete.gif\"
alt=\"folder\" height=20 width=20 style=\"border:0;\" /></a></td></tr>";
$(html).appendTo("#filelist");
shadow = !shadow;
});
})
.error(function(){
alert('Connection error. Check if the web sharing
is on and the iphone/ipod still connected to the network.');
});
}
$.ajaxSetup({cache: true});
$(document).ready(function(){
cargaLista('');
});
</script>
PoC #2:
--- PoC Session Logs [GET] (Execution) ---
Status: 200[OK]
GET http://localhost:8080/files/%3[LOCAL COMMAND INJECT
VULNERABILITY!]_=1407321412178 Load Flags[LOAD_BACKGROUND VALIDATE_ALWAYS ]
Größe des Inhalts[42] Mime Type[application/x-unknown-content-type]
Request Header:
Host[localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101
Firefox/31.0]
Accept[application/json, text/javascript, */*; q=0.01]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
X-Requested-With[XMLHttpRequest]
Referer[http://localhost:8080/]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[42]
Date[Wed, 06 Aug 2014 10:37:15 GMT]
Status: pending[]
GET http://localhost:8080/..%3C/[LOCAL COMMAND INJECT VULNERABILITY!] Load
Flags[LOAD_DOCUMENT_URI ] Größe des Inhalts[unknown] Mime Type[unknown]
Request Header:
Host[localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101
Firefox/31.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://localhost:8080/]
PoC: Source Filename - File Dir Index Listing
<div id="tlista">
<table border="0" cellpadding="0" cellspacing="0">
<thead>
<tr>
<th class="icon"><a href="javascript:cargaLista('..')"
class="file"> <img src="back.png" alt="back" border="0/" height="20"
width="20"></a>
</th>
<th class="filename">
Name
</th>
<th class="size">
Size
</th>
<th class="date">
Modified
</th>
<th class="del">
<a href="javascript:cargaLista(rutaActual)"
class="file"> <img src="refresh.png" alt="back" border="0/" height="16"
width="16"></a>
</th>
</tr>
</thead>
</table>
<table border="0" cellpadding="0" cellspacing="0">
<tbody id="filelist"><tr><td class="icon"><img src="folder.png" alt="folder"
height="20" width="20"></td><td class="filename">
<a href="javascript:cargaLista("h[LOCAL COMMAND INJECT VULNERABILITY!])"
class="file">[LOCAL COMMAND INJECT VULNERABILITY!]"></a></td>
<td class='size'> </td><td class='date'>06.08.14 12:27</td><td class='del'><a
href='#' onclick='confirma("/[LOCAL COMMAND INJECT VULNERABILITY!]")'>
<img src="delete.gif" alt="folder" height=20 width=20 style="border:0;"
/></a></td></tr></tbody></table></iframe></a></td></tr></tbody>
Solution - Fix & Patch:
=======================
The vulnerabilities can be patched by a secure parse and encode of the
vulnerable file- and foldername values.
Restrict the local app user input on both values to prevent further command
injection attacks. Do not forget to parse the affected output listing in the
file dir listing.
Security Risk:
==============
The security risk of both command inject web vulnerabilities in the file- and
foldername values are estimated as medium(+).
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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