ASP.NET - Version Disclosure Issue vulnerability Windows 2019

Henry Niekoop 86 Reputation points
2021-05-04T14:52:13.717+00:00

How do I disable ASP.NET - Version Disclosure Issue in Windows 2019 (Used with RD gateway portal)? If I remove the X-Powered-By ASP.NET http response headers in IIS the RD Gateway website no longer works.

Internet Information Services
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  1. Reza-Ameri 16,831 Reputation points
    2021-05-04T14:56:05.513+00:00

    This is not a vulnerability but this is an expected behavior.
    You won't need to remove it, you could replace it with other value.

    1 person found this answer helpful.
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  2. Henry Niekoop 86 Reputation points
    2021-05-04T15:03:27.027+00:00

    Thanks but can you please explain further? Can I change the value ASP.NET to anything let's say "XXXXX"?

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  3. Sam Wu-MSFT 7,036 Reputation points Microsoft Vendor
    2021-05-05T05:52:08.017+00:00

    Hi @Henry Niekoop

    Apply the following changes to your web.config file to prevent information leakage by using custom error pages and removing X-AspNet-Version from HTTP responses. 

    <System.Web>  
     <httpRuntime enableVersionHeader="false" />   
     </customErrors>  
</System.Web>

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  4. MotoX80 31,571 Reputation points
    2021-05-05T14:04:33.027+00:00

    If I remove the X-Powered-By ASP.NET http response headers in IIS the RD Gateway website no longer works.

    Is this what you removed? What if you remove it at the server level instead of the site level?

    What error do you get when it "no longer works"?

    93940-capture.jpg

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  5. Henry Niekoop 86 Reputation points
    2021-05-05T14:07:04.737+00:00

    Yes, that is what I removed. At the server level. I forgot the exact error but the site was no longer working.