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BITS blocked by Gateway Anti-Virus with no dropped packets

03/26/2020 1 People found this article helpful 190,798 Views

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    Description

    When you try to download a file by using the Background Intelligent Transfer Service (BITS): "Content file download failed". The same has been seen when trying to update Adobe Acrobat from MACOS using the built-in updater.

    As a troubleshooting test, disabling HTTP Inbound Inspection on SonicWall Gateway Anti-Virus will fix this but no related signatures blocking this traffic can be found and running a packet monitor will show all packets forwarded (no drops).

    Cause

    The Accept-Range header is used by the server to inform the client if ranges are supported. Ranges are used by clients to request a partial file (i.e. from bytes 30 to 500).

    When you copy a file by using BITS in background mode, the file is copied in multiple small parts. To perform this kind of copy operation, BITS uses the HTTP 1.1 Content-Range header. If you are behind a proxy server or behind a firewall that removes this header, the file copy operation is unsuccessful.

    NOTE:  When BITS copies files in foreground mode, BITS does not use this header.

    However, exploits can be used when servers accept ranges – if an attacker request bytes from 0 to a very large number (larger than 64-bit for example), they can cause a buffer/integer overflow.

    NOTE: This should not happen if servers are up-to-date  to the latest IIS but if the customer runs a old/outdated server, the attack may pass through.

    SonicWall is well known to remove this header as we consider it non-secure however if an application uses HTTP ranges this option must be enabled.

    Resolution

    To fix this, please follow these steps:

    1. Login to your firewall.
    2. Edit the URL https://IP_Firewall/main.html by replacing main.html with diag.html
    3. Click Internal Settings
    4. Enable the option "Keep HTTP header Accept-Range bytes"

    This way the SonicWall will not remove the header but this may expose your servers if they're not up-to-date.

    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 > SonicWall NSA Series > IPS/GAV/Spyware
    • Firewalls > TZ Series > IPS/GAV/Spyware
    • Firewalls > NSa Series > IPS/GAV/Spyware

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