CVE-2017-0247: Improper Input Validation

May 12, 2017 (updated June 30, 2021)

A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.

References

github.com/aspnet/Announcements/issues/239
nvd.nist.gov/vuln/detail/CVE-2017-0247
technet.microsoft.com/en-us/library/security/4021279.aspx
www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS

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