Document Title:

HiDisk 2.4 iOS - (currentFolderPath) Persistent Vulnerability

References (Source):

http://www.vulnerability-lab.com/get_content.php?id=1496

Release Date:

2015-05-19

Vulnerability Laboratory ID (VL-ID):

1496

Common Vulnerability Scoring System:

3.5

Product & Service Introduction:

HiDisk is such an app.it`s a Safe,a File Manager,a Media Player,a Files Reader. As a Safe － Provide Password System to secure your
private stuff (photo,video,audio,note,docs,etc.) As a File Manager － Easily add folder&subfolder and quickly organize your files
with few taps. As a Media Player － Play music,voice memos and video within the app. As a Files Reader - Not only provide slideshow
just like native photo app,but also provide viewing docs(iWork,Windows office,etc.)

(Copy of the Homepage: https://itunes.apple.com/en/app/hidisk-pro-schutz-privat-foto/id575070537 )

Abstract Advisory Information:

The Vulnerability Laboratory Core Research Team discovered an application-side input validation vulnerability in the HiDisk v2.4 iOS mobile application.

Vulnerability Disclosure Timeline:

2015-05-19: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Published

Affected Product(s):

Elite Tracy
Product: HiDisk - iOS Mobile Web Application 2.4

Exploitation Technique:

Remote

Severity Level:

Medium

Technical Details & Description:

A persistent input validation web vulnerability has been discovered in the official HiDisk v2.4 iOS mobile web-application.
The vulnerability allows remote attacker or low privilege user accounts to inject malicious codes to the application-side
of the affected mobile iOS web-application.

The application-side vulnerability is located in the `name` value (currentFolderPath) of the `folder add` module. Local attackers with low
privilege user accounts are able to inject own malicious script codes via folder name input to compromise the `Wifi Web Access` interface
web-application. The attack vector is located on the application-side of the wifi web access interface and the request method to inject is
an app sync. The injection point is the add folder input and the execution occurs in the index path dir listing.

The security risk of the application-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.5.
Exploitation of the application-side web vulnerability requires a low privilege web-application user account and low or medium user interaction.
Successful exploitation of the vulnerabilities results in persistent phishing mails, session hijacking, persistent external redirect to malicious
sources and application-side manipulation of affected or connected module context.

Request Method(s):
[+] Sync

Vulnerable Module(s):
[+] Folder Add (Ordner Hinzufuegen)

Vulnerable Parameter(s):
[+] name (currentFolderPath)

Affected Module(s):
[+] Index Path Listing
[+] Subfolder Path Listing

Proof of Concept (PoC):

The persistent input validation web vulnerability can be exploited by local attackers with low privilege application user account and low or medium user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

PoC: #1
<a href='#' name='/"><[PERSISTENT INJECTED SCRIPT CODE!!]>' class='folder' onclick='dClickHandler(this);' style='position:relative; text-decoration:none;'>
<img class='aImg' style='' src='/Web/folder2.png' height='60px' width='60px'/><div class='name' style='position:absolute; top:1px !important; top:65px; height:17px;
left:10px !important; left:2px; width:60px; text-align:center; opacity:0.8; filter:alpha(opacity=80); color:black; font-size:10px; line-height:4px;z-index:2000;
'>"><[PERSISTENT INJECTED SCRIPT CODE!!]></div></a><a href='#' name='/hello' class='folder' onclick='dClickHandler(this);' style='position:relative; text-decoration:none;'>
<img class='aImg' style='' src='/Web/folder2.png' height='60px' width='60px'/><div class='name' style='position:absolute; top:1px !important; top:65px; height:17px;
left:10px !important; left:2px; width:60px; text-align:center; opacity:0.8; filter:alpha(opacity=80); color:black; font-size:10px; line-height:4px;z-index:2000;'>hello</div></a>
<a href='#' name='/test path var' class='folder' onclick='dClickHandler(this);' style='position:relative; text-decoration:none;'>
<img class='aImg' style='' src='/Web/folder2.png' height='60px' width='60px'/><div class='name' style='position:absolute; top:1px !important; top:65px; height:17px;
left:10px !important; left:2px; width:60px; text-align:center; opacity:0.8; filter:alpha(opacity=80); color:black; font-size:10px; line-height:4px;z-index:2000;'>
test path var</div></a><a href='#' name='/2.png' class='image' onclick='aClickHandler(this);'>
<img class='aImg' src='/2.png_THUMBNAIL' height='60px' width='60px'/></a><br/><br/><br/></div>

PoC: #2
<script type="text/javascript" src="/Web/uploadify/jquery.min.js"></script>

<script type="text/javascript" src="/Web/uploadify/jquery.uploadify.js"></script>
<script language="javascript">
var currentFolderPath = '/"><[PERSISTENT INJECTED SCRIPT CODE!!]>';

var alertMessage = "null";

var actionType = "Show";

var submitting = false;

var tipHiddenTop = -200;

var tipShownTop = -80;

var lastShownTipDate;

var uploadLimit = 2000;

if (alertMessage != "null") {

alert(alertMessage);
}
…
<a href="/back.html" style="text-decoration:none; position:absolute; top:0; left:0;">
<img src="/Web/back3.png" style="width:25px; height:25px; border:none; vertical-align:middle" />
Oberverzeichnis [aktuell:/"><[PERSISTENT INJECTED SCRIPT CODE!!]>]</a>
…
if (tag.className == "image") {

document.body.style.overflow = "hidden"; //禁止body滚动

var wrap = document.getElementById("wrap");

wrap.style.display = "block";

var src = "/" + actionType + tag.name;
wrap.innerHTML = "<iframe id='photo-viewer' src='" + src + "' style='position:absolute;width:100%;height:100%' frameborder='no' scrolling='no' allowtransparency='yes' />";
}
else {

if (!tippable()) {

Reference(s):
http://localhost:8860/

Solution - Fix & Patch:

The vulnerability can be patched by a secure parse and encode of the vulnerable folder name input.
Restrict the input by disallow the usage of special chars. Encode the folder path var to prevent the persistent script code execution in the listing.

Security Risk:

The security risk of the persistent input validation web vulnerability in the folder name value is estimated as medium. (CVSS 3.5)

Credits & Authors:

Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected]) [www.vulnerability-lab.com]

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