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Cross-origin Resource Sharing bypass in ASP.NET Core

High severity GitHub Reviewed Published May 13, 2022 to the GitHub Advisory Database • Updated Jan 27, 2023

Package

nuget Microsoft.AspNetCore.Mvc.Core (NuGet)

Affected versions

>= 1.0.0, < 1.0.6
>= 1.1.0, < 1.1.6

Patched versions

1.0.6
1.1.6
nuget Microsoft.AspNetCore.Mvc.Cors (NuGet)
>= 1.0.0, < 1.0.6
>= 1.1.0, < 1.1.6
1.0.6
1.1.6

Description

ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure Vulnerability".

References

Published by the National Vulnerability Database Nov 15, 2017
Published to the GitHub Advisory Database May 13, 2022
Reviewed Jul 8, 2022
Last updated Jan 27, 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
High
Integrity
None
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:H/I:N/A:N

EPSS score

0.898%
(83rd percentile)

Weaknesses

No CWEs

CVE ID

CVE-2017-8700

GHSA ID

GHSA-3rp6-rjw4-cq39

Source code

No known source code
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