Vulnerability CVE-2017-0247
Published: 2017-05-12

Description:
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 before 1.0.4 and 1.1.x before 1.1.3 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.

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Microsoft -> Microsoft.aspnetcore.mvc.viewfeatures 
Microsoft -> Microsoft.aspnetcore.mvc.formatters.xml 
Microsoft -> Asp.net 
Microsoft -> Microsoft.aspnetcore.mvc.abstractions 
Microsoft -> Microsoft.aspnetcore.mvc.razor.host 
Microsoft -> System.net.security 
Microsoft -> Microsoft.aspnetcore.mvc.webapicompatshim 
Microsoft -> Microsoft.aspnetcore.mvc 
Microsoft -> Microsoft.aspnetcore.mvc.core 
Microsoft -> System.net.http.winhttphandler 
Microsoft -> Microsoft.aspnetcore.mvc.dataannotations 
Microsoft -> Microsoft.aspnetcore.mvc.cors 
Microsoft -> Microsoft.aspnetcore.mvc.razor 
Microsoft -> Microsoft.aspnetcore.mvc.formatters.json 
Microsoft -> System.net.http 
Microsoft -> System.text.encodings.web 
Microsoft -> Microsoft.aspnetcore.mvc.apiexplorer 
Microsoft -> Microsoft.aspnetcore.mvc.taghelpers 
Microsoft -> System.net.websockets.client 
Microsoft -> Microsoft.aspnetcore.mvc.localization 

 References:
https://github.com/aspnet/Announcements/issues/239
https://technet.microsoft.com/en-us/library/security/4021279.aspx
https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS
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