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Cookie parsing failure

High severity GitHub Reviewed Published May 24, 2022 to the GitHub Advisory Database • Updated Jan 9, 2024

Package

nuget Microsoft.AspNetCore.App (NuGet)

Affected versions

<= 2.1.21

Patched versions

2.1.22
nuget Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.win-arm (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet)
>= 3.1.5, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet)
>= 3.1.0, < 3.1.8
3.1.8
nuget Microsoft.AspNetCore.Http (NuGet)
< 2.1.22
2.1.22
nuget Microsoft.Owin (NuGet)
< 4.1.1
4.1.1

Description

A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded.The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names., aka 'Microsoft ASP.NET Core Security Feature Bypass Vulnerability'.

References

Published by the National Vulnerability Database Sep 11, 2020
Published to the GitHub Advisory Database May 24, 2022
Reviewed Jul 7, 2022
Last updated Jan 9, 2024

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS score

0.370%
(73rd percentile)

Weaknesses

No CWEs

CVE ID

CVE-2020-1045

GHSA ID

GHSA-hxrm-9w7p-39cc

Source code

No known source code

Credits

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