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You will hopefully find this site is well-secured and I'm not interested in being hacked. I'm interested in learning about how people try to hack me, though.
What is this endpoint?
Telerik.Web.UI.WebResource.axd
Telerik UI for ASP.NET AJAX web-resource handler, target of CVE-2017-9248 and CVE-2019-18935
What an attacker could do
Confirms a vulnerable Telerik UI for ASP.NET AJAX handler; CVE-2017-9248 allows decryption of the dialog key and CVE-2019-18935 enables deserialization leading to remote code execution on the web server.
How to defend it
Upgrade Telerik UI to a patched release, rotate the Telerik.Web.UI encryption keys, and disable the dialog handler/async-upload if unused.
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Want to dive deeper into this topic? Check out the official documentation.
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