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ASP.NET Core fails to properly validate web requests

High severity GitHub Reviewed Published Oct 16, 2018 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

nuget Microsoft.AspNetCore.Mvc (NuGet)

Affected versions

>= 1.1.0, < 1.1.3
>= 1.0.0, < 1.0.4

Patched versions

1.1.3
1.0.4
nuget Microsoft.AspNetCore.Mvc.Abstractions (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.ApiExplorer (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.Core (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.Cors (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.DataAnnotations (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.Formatters.Json (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.Formatters.Xml (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.Localization (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.Razor (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.Razor.Host (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.TagHelpers (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.ViewFeatures (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget Microsoft.AspNetCore.Mvc.WebApiCompatShim (NuGet)
>= 1.0.0, < 1.0.4
>= 1.1.0, < 1.1.3
1.0.4
1.1.3
nuget System.Net.Http (NuGet)
= 4.1.1
= 4.3.1
4.1.2
4.3.2
nuget System.Net.Http.WinHttpHandler (NuGet)
= 4.0.0
>= 4.3.0, < 4.5.4
4.0.1
4.5.4
nuget System.Net.Security (NuGet)
= 4.0.0
= 4.3.0
4.0.1
4.3.1
nuget System.Net.WebSockets.Client (NuGet)
= 4.0.0
= 4.3.0
4.0.1
4.3.1
nuget System.Text.Encodings.Web (NuGet)
= 4.0.0
= 4.3.0
4.0.1
4.3.1

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.

References

Published by the National Vulnerability Database May 12, 2017
Published to the GitHub Advisory Database Oct 16, 2018
Reviewed Jun 16, 2020
Last updated Feb 1, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(93rd percentile)

Weaknesses

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Learn more on MITRE.

CVE ID

CVE-2017-0247

GHSA ID

GHSA-6xh7-4v2w-36q6

Source code

No known source code
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