Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2017-0247

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.

Published

2017-05-12T14:29:03.910

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	microsoft	asp.net_model_view_controller	1.0.0	Yes
Application	microsoft	asp.net_model_view_controller	1.0.1	Yes
Application	microsoft	asp.net_model_view_controller	1.0.2	Yes
Application	microsoft	asp.net_model_view_controller	1.0.3	Yes
Application	microsoft	asp.net_model_view_controller	1.1.0	Yes
Application	microsoft	asp.net_model_view_controller	1.1.1	Yes
Application	microsoft	asp.net_model_view_controller	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.abstractions	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.abstractions	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.abstractions	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.abstractions	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.abstractions	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.abstractions	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.abstractions	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.apiexplorer	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.apiexplorer	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.apiexplorer	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.apiexplorer	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.apiexplorer	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.apiexplorer	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.apiexplorer	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.cors	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.cors	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.cors	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.cors	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.cors	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.cors	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.cors	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.dataannotations	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.dataannotations	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.dataannotations	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.dataannotations	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.dataannotations	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.dataannotations	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.dataannotations	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.json	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.json	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.json	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.json	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.json	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.json	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.json	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.xml	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.xml	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.xml	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.xml	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.xml	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.xml	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.formatters.xml	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.localization	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.localization	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.localization	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.localization	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.localization	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.localization	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.localization	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor.host	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor.host	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor.host	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor.host	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor.host	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor.host	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.razor.host	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.taghelpers	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.taghelpers	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.taghelpers	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.taghelpers	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.taghelpers	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.taghelpers	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.taghelpers	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.viewfeatures	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.viewfeatures	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.viewfeatures	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.viewfeatures	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.viewfeatures	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.viewfeatures	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.viewfeatures	1.1.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.webapicompatshim	1.0.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.webapicompatshim	1.0.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.webapicompatshim	1.0.2	Yes
Application	microsoft	microsoft.aspnetcore.mvc.webapicompatshim	1.0.3	Yes
Application	microsoft	microsoft.aspnetcore.mvc.webapicompatshim	1.1.0	Yes
Application	microsoft	microsoft.aspnetcore.mvc.webapicompatshim	1.1.1	Yes
Application	microsoft	microsoft.aspnetcore.mvc.webapicompatshim	1.1.2	Yes
Application	microsoft	system.net.http	4.1.1	Yes
Application	microsoft	system.net.http	4.3.1	Yes
Application	microsoft	system.net.http.winhttphandler	4.0.1	Yes
Application	microsoft	system.net.http.winhttphandler	4.3.0	Yes
Application	microsoft	system.net.security	4.0.0	Yes
Application	microsoft	system.net.security	4.3.0	Yes
Application	microsoft	system.net.websockets.client	4.0.0	Yes
Application	microsoft	system.net.websockets.client	4.3.0	Yes
Application	microsoft	system.text.encodings.web	4.0.0	Yes
Application	microsoft	system.text.encodings.web	4.3.0	Yes

References

https://github.com/aspnet/Announcements/issues/239 Technical Description, Third Party Advisory ([email protected])
https://technet.microsoft.com/en-us/library/security/4021279.aspx Patch, Vendor Advisory ([email protected])
https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS Exploit, Third Party Advisory ([email protected])
https://github.com/aspnet/Announcements/issues/239 Technical Description, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://technet.microsoft.com/en-us/library/security/4021279.aspx Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)