iVault Private P&V 1.1 iOS - Path Traversal Vulnerability

From: Vulnerability Lab <research@vulnerability-lab.com>
To: bugtraq@securityfocus.com,bugs@securitytracker.com
Subject: iVault Private P&V 1.1 iOS - Path Traversal Vulnerability

Document Title:
iVault Private P&V 1.1 iOS - Path Traversal Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
The BEST and MOST convenient private Photo&Video App! It provides multiple security mechanisms, and perfectly keeps your privacy 
away from peeping eyes. First, you need to add your \u20ac\u02dcSPECIAL\u20ac\u2122 photos&videos into iVault, it provides many convenient features.
Second, you may concern about the security things. Third, iVault can provide more than you can imagine.

(Copy of the Homepage: https://itunes.apple.com/us/app/ivault-private-photo.s-video.s/id780124144 )

Abstract Advisory Information:
The Vulnerability Laboratory Research Team discovered multiple vulnerabilities in the official iVault Private Photos & Videos v1.1 iOS mobile application.

Vulnerability Disclosure Timeline:
2014-04-09:      Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Arvin Brook
Product: iVault - Private Photos & Videos Vault + Secrets Folders Manager 1.1

Exploitation Technique:

Severity Level:

Technical Details & Description:
The application-side path/directory traversal web vulnerability has been discovered in the official iVault Private Photos & Videos v1.1 iOS mobile application.
The vulnerability allows an local attacker to unauthorized access path- or directories values to leak information or compromise the mobile application privacy.

The first vulnerability is located in the `path & directory` value of the wifi web-access module. Remote attackers are able to request the via vulnerable path 
value any application content even if protected. The attackers are able to include local frames as path value to request an internal application path to 
unauthorized access stored private images/files. The issue can be combined with script-code attacks but is not limited to the condition only. The attack vector 
is located on the application-side and the method to include the malicious path value request is a sync (device). The security risk of the 
directory traversal vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 6.8(+)|(-)6.9.

Exploitation of the local `path & directory` vulnerability requires a low privileged device user account with physical device access and without user interaction.
Successful exploitation of the vulnerability results in unauthorized picture or file access, information disclosure and further application-side attacks.

Vulnerable Input(s):
                             [+] Path

Vulnerable Module(s):
                            [+] Directory

Vulnerable Parameter(s):
                            [+] Oberverzeichnis > aktuell:(x)

Affected Module(s):
                                [+] Path Dir Listing (each WiFi web access side)

Proof of Concept (PoC):
The application-side vulnerability can be exploited by local attackers with physical device access and low privileged user account.
User interaction is not required. For security demonstration or to reproduce the vulnerability follow the provided information 
and steps below to continue.

PoC: Source

            <script language="javascript">
                var currentFolderPath = '/"<../../var/mobile/Applications[PATH/DIRECTORY TRAVERSAL VULNERABILITY!]';
                var alertMessage = "%%ALERT_MESSAGE%%";
                var actionType = "Show";
                var submitting = false;
                var tipHiddenTop = -200;
                var tipShownTop = -80;
                var lastShownTipDate;
                var maxNumberOfImageCurrentEvent = 48;
                var maxNumberOfVideoCurrentEvent = 5;
                var limitationMsg = "Die Anzahl deiner Dokumente hat schon an der Grenze der freien Edition (maximal 50 Bilder oder Fotos, 5 Videos) erreicht. 
            Möchtest du nicht eine volle Edition bekommen und damit alle Einschränkungen weglassen? No thanks ;) -bkm";
                var videoTypes = ["MOV", "MP4", "MPV", "M4V"];
                function tippable() {
                    var currentTop = document.getElementById("tip").style.top;
                    currentTop = currentTop.substring(0, currentTop.length-2);
                    currentTop = Number(currentTop);
                    var not = ((currentTop > tipHiddenTop) && (currentTop < tipShownTop))
                    return !not;

PoC: Execution

<div id="content" onselectstart="return false;">
<a href="/logout.html" style="float:right; margin:10px;">outloggen</a>
<h1 style="padding:0 15px 0">WiFi web access</h1>
<div id="buttons" style="position:relative; left:10px; height:60px; padding-top:10x;">
<a href="/back.html" style="text-decoration:none; top:0; left:0;"><img src="/Web/back2.png" style="width:30px; height:30px; 
border:none; margin:-9px 6px;">Oberverzeichnis [aktuell:/>"<../../var/mobile/Applications[PATH/DIRECTORY TRAVERSAL VULNERABILITY!]>]</a>


Solution - Fix & Patch:
The vulnerability can be patched by a secure restriction and filter process of the `path` and `directory` value request.
Parse and encode also the vulnerable `Oberverzeichnis > aktuell:(x)` output values on each wifi web access page to prevent directory traversal attacks.

Security Risk:
The security risk of the local directory/path traversal web vulnerability is estimated as high(-).

Credits & Authors:
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]

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