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Document Title:
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===============
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PDF Converter & Editor 2.1 iOS - File Include Vulnerability
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References (Source):
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====================
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http://www.vulnerability-lab.com/get_content.php?id=1480
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Release Date:
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=============
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2015-05-06
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Vulnerability Laboratory ID (VL-ID):
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====================================
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1480
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Common Vulnerability Scoring System:
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====================================
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6.9
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Product & Service Introduction:
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===============================
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Text Editor & PDF Creator is your all-in-one document management solution for iPhone, iPod touch and iPad.
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It can catch documents from PC or Mac via USB cable or WIFI, email attachments, Dropbox and box and save
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it on your iPhone, iPod Touch or iPad locally.
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(Copy of the Vendor Homepage: https://itunes.apple.com/it/app/text-editor-pdf-creator/id639156936 )
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Abstract Advisory Information:
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==============================
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The Vulnerability Laboratory Core Research Team discovered file include web vulnerability in the official AppzCreative - PDF Converter & Text Editor v2.1 iOS mobile web-application.
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Vulnerability Disclosure Timeline:
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==================================
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2015-05-06: Public Disclosure (Vulnerability Laboratory)
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Discovery Status:
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=================
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Published
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Affected Product(s):
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====================
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AppzCreative Ltd
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Product: PDF Converter & Text Editor - iOS Web Application (Wifi) 2.1
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Exploitation Technique:
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=======================
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Remote
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Severity Level:
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===============
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High
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Technical Details & Description:
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================================
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A local file include web vulnerability has been discovered in the official AppzCreative - PDF Converter & Text Editor v2.1 iOS mobile web-application.
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The local file include web vulnerability allows remote attackers to unauthorized include local file/path requests or system specific path commands
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to compromise the mobile web-application.
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The web vulnerability is located in the `filename` value of the `submit upload` module. Remote attackers are able to inject own files with malicious
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`filename` values in the `file upload` POST method request to compromise the mobile web-application. The local file/path include execution occcurs in
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the index file dir listing of the wifi interface. The attacker is able to inject the local file include request by usage of the `wifi interface`
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in connection with the vulnerable file upload POST method request.
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Remote attackers are also able to exploit the filename issue in combination with persistent injected script codes to execute different malicious
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attack requests. The attack vector is located on the application-side of the wifi service and the request method to inject is POST.
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The security risk of the local file include vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.9.
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Exploitation of the local file include web vulnerability requires no user interaction or privileged web-application user account.
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Successful exploitation of the local file include vulnerability results in mobile application compromise or connected device component compromise.
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Request Method(s):
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[+] [POST]
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Vulnerable Module(s):
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[+] Submit (Upload)
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Vulnerable Parameter(s):
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[+] filename
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Affected Module(s):
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[+] Index File Dir Listing (http://localhost:52437/)
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Proof of Concept (PoC):
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=======================
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The local file include web vulnerability can be exploited by remote attackers (network) without privileged application user account and without user interaction.
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For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.
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Manual steps to reproduce the vulnerability ...
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1. Install the software to your iOS device
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2. Start the mobile ios software and activate the web-server
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3. Open the wifi interface for file transfers
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4. Start a session tamper and upload a random fil
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5. Change in the live tamper by interception of the vulnerable value the filename input (lfi payload)
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6. Save the input by processing to continue the request
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7. The code executes in the main file dir index list of the local web-server (localhost:52437)
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8. Open the link with the private folder and attach the file for successful exploitation with the path value
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9. Successful reproduce of the vulnerability!
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PoC: Upload File (http://localhost:52437/Box/)
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<div id="module_main"><bq>Files</bq><p><a href="..">..</a><br>
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<a href="<iframe>2.png"><../[LOCAL FILE INCLUDE VULNERABILITY IN FILENAME!]>2.png</a> ( 0.5 Kb, 2015-04-30 10:58:46 +0000)<br />
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</p><form action="" method="post" enctype="multipart/form-data" name="form1" id="form1"><label>upload file<input type="file" name="file" id="file" /></label><label><input type="submit" name="button" id="button" value="Submit" /></label></form></div></center></body></html></iframe></a></p></div>
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--- PoC Session Logs [POST] (LFI - Filename) ---
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Status: 200[OK]
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POST http://localhost:52437/Box/
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Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[3262] Mime Type[application/x-unknown-content-type]
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Request Header:
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Host[localhost:52437]
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User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0]
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Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
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Accept-Language[de,en-US;q=0.7,en;q=0.3]
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Accept-Encoding[gzip, deflate]
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Referer[http://localhost:52437/Box/]
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Connection[keep-alive]
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POST-Daten:
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POST_DATA[-----------------------------321711425710317
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Content-Disposition: form-data; name="file"; filename="../[LOCAL FILE INCLUDE VULNERABILITY IN FILENAME!]>2.png"
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Content-Type: image/png
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Reference(s):
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http://localhost:52437/
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http://localhost:52437/Box/
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Solution - Fix & Patch:
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=======================
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The vulnerability can be patched by a secure validation of the filename value in the upload POST method request. Restrict the filename input and
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disallow special chars. Ensure that not multiple file extensions are loaded in the filename value to prevent arbitrary file upload attacks.
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Encode the output in the file dir index list with the vulnerable name value to prevent application-side script code injection attacks.
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Security Risk:
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==============
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The security rsik of the local file include web vulnerability in the filename value of the wifi service is estimated as high. (CVSS 6.9)
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Credits & Authors:
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==================
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Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]
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Disclaimer & Information:
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=========================
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The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed
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or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable
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in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab
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or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for
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consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses,
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policies, deface websites, hack into databases or trade with fraud/stolen material.
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Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com
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Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com
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Copyright © 2015 | Vulnerability Laboratory - [Evolution Security GmbH]™
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--
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VULNERABILITY LABORATORY - RESEARCH TEAM
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SERVICE: www.vulnerability-lab.com
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