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Blocking Upload of Webmail Attachments using Application Firewall for Hotmail.com/Outlook.com

03/26/2020 11 People found this article helpful 195,911 Views

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    Description

    Blocking Upload of Webmail Attachments using Application Firewall for Hotmail.com/Outlook.com

    Resolution

     


    Feature/Application:

    This article describes the method to block uploading of email attachments in webmail. This method uses the  HTTP URI Content option in Application Firewall Objects. HTTP URI Content field allows users to configure HTTP URI content and their respective values for Application Firewall to filter traffic. For more info on HTTP URI refer RFC 2616.

    The method we use here is the HTTP URI Content "/mail/SilverlightAttachmentUploader.aspx".  The following screen-capture shows the wireshark capture of a webmail attachment upload in outlook.com.

    Note:

    1. Although the solution described here has been tested, there is a possibility that it may affect traffic other than webmail.

    2. Client DPI-SSL required, if using HTTPS.


    Image
     


    Procedure: 

    • Login to the SonicWall Management GUI.
    • Navigate to the Application Firewall > Application Objects page (Match Objects page in 5.8.0.0 and above).
    • Click on Add New Object and enter the following information: 

    Image
     

    • Navigate to the Firewall App Rules page.
    • Check the box under Enable App Rules.
    • Click on Add and create the following policy:

    Image


    How to Test:

    From a workstation behind the SonicWall, log into webmail. Try to upload an attachment. Check SonicWall logs and you will find logs similar to the one below.

    Image

     

    Related Articles

    • How to Setup the SonicWave 600 series
    • Identical Access Rules for different users/user groups
    • Advanced Network Security eLearning Training Course

    Categories

    • Firewalls > TZ Series
    • Firewalls > SonicWall SuperMassive E10000 Series
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