Transfer Master 3.3 Denial Of Service

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  • Transfer Master version 3.3 for iOS suffers from a denial of service vulnerability.
    MD5 | bfb16346108d81a312ef921e89f0b550

    Document Title:  
    Transfer Master v3.3 iOS - Denial of Service Vulnerability  
    References (Source):  
    Release Date:  
    Vulnerability Laboratory ID (VL-ID):  
    Common Vulnerability Scoring System:  
    Vulnerability Class:  
    Denial of Service  
    Current Estimated Price:  
    500€ - 1.000€  
    Product & Service Introduction:  
    Transfer Master - Transfer photo,video,file,contact and File manager.  
    (Copy of the Homepage:  
    Abstract Advisory Information:  
    The vulnerability laboratory core research team discovered a remote  
    denial of service vulnerability in the Transfer Master v3.3 mobile ios  
    Vulnerability Disclosure Timeline:  
    2020-04-28: Public Disclosure (Vulnerability Laboratory)  
    Discovery Status:  
    Exploitation Technique:  
    Severity Level:  
    Authentication Type:  
    Pre auth - no privileges  
    User Interaction:  
    No User Interaction  
    Disclosure Type:  
    Independent Security Research  
    Technical Details & Description:  
    A remote denial of service vulnerability has been discovered in the  
    official Transfer Master v3.3 mobile ios web-application.  
    The denial of service vulnerability is located in the delete post method  
    request on the files path. Remote attackers can  
    manipulate the ui by sending special crafted requests to cause a null  
    pointer error that crashs the wifi web-server.  
    The attacker changes the file delete request to a null path which  
    results in a null pointer that crashs the application.  
    Successful exploitation of the denial of service vulnerability results  
    in a wifi web-server ui crash and freeze.  
    Proof of Concept (PoC):  
    The denial of service vulnerability can be exploited by remote attackers  
    with wifi network access without user interaction.  
    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 local ios app  
    2. Open the wifi share option to start the web-server  
    3. Move to the front ui  
    4. Tamper the https session and reply by deleting the files path with  
    (null) as empty quote  
    5. The web-server crashs and the wifi ui becomes unavailable by a blank  
    screen that responds with not found  
    Note: Service still alive but finally unavailable cause of a null  
    pointer issue  
    6. Successful reproduce of the denial of service vulnerability!  
    --- PoC Session Logs (POST/GET) ---  
    Host: localhost:8181  
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)  
    Gecko/20100101 Firefox/75.0  
    content-type: application/x-www-form-urlencoded;charset=UTF-8  
    Content-Length: 28  
    Connection: keep-alive  
    POST: HTTP/1.1 302 Found  
    Location: /  
    Content-Type: text/html; charset=utf-8  
    Content-Length: 67  
    Host: localhost:8181  
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)  
    Gecko/20100101 Firefox/75.0  
    Accept-Language: en-US,en;q=0.5  
    Accept-Encoding: gzip, deflate  
    Referer: http://localhost:8181/  
    Connection: keep-alive  
    - (Game Over)  
    GET: HTTP/1.1 404 Not Found (Unavailable)  
    Accept-Ranges: bytes  
    Content-Length: 0  
    Credits & Authors:  
    Vulnerability-Lab -  
    Benjamin Kunz Mejri -  
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