High severity · published May 12, 2017
CVE-2017-0247
A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests
7.5
CVSS
16.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)16.9% · higher than 97% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AM
Asp.net Model View Controller · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.abstractions · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.apiexplorer · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.cors · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.dataannotations · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.formatters.json · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.formatters.xml · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.localization · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.razor · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.razor.host · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.taghelpers · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
MI
Microsoft.aspnetcore.mvc.viewfeatures · Microsoft
1.0.0; 1.0.1; 1.0.2; 1.0.3; 1.1.0; 1.1.1; +1 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-0247
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-0247
Technical Description
https://github.com/aspnet/Announcements/issues/239
Patch
https://technet.microsoft.com/en-us/library/security/4021279.aspx
Exploit
https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS
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