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CVE-2020-1045

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Date: September 10, 2020

<p>A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.</p> <p>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.</p> <p>The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.</p>

Language: C#

Severity Score

Related Resources (17)

https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.8/3.1.8.md#changes-in-318
https://nvd.nist.gov/vuln/detail/CVE-2020-1045
https://github.com/github/advisory-database/issues/302
https://access.redhat.com/errata/RHSA-2020:3699
https://github.com/dotnet/aspnetcore/issues/25701
https://github.com/dotnet/aspnetcore/pull/24264
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ASICXQXS4M7MTAF6SGQMCLCA63DLCUT3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LN2FUVBSVPGK7AU3NMLO3YR6CGONQPB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ASICXQXS4M7MTAF6SGQMCLCA63DLCUT3
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ASICXQXS4M7MTAF6SGQMCLCA63DLCUT3
https://access.redhat.com/security/cve/CVE-2020-1045
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1045
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5LN2FUVBSVPGK7AU3NMLO3YR6CGONQPB
https://github.com/dotnet/aspnetcore/issues/25701#issuecomment-689434477
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LN2FUVBSVPGK7AU3NMLO3YR6CGONQPB/
https://github.com/dotnet/announcements/issues/165
https://www.mend.io/vulnerability-database/CVE-2020-1045

Severity Score

Weakness Type (CWE)

Insufficient Information

NVD-CWE-noinfo

Top Fix

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Upgrade Version

Upgrade to version microsoft.aspnetcore.http - 2.1.22;microsoft.aspnetcore.app - 2.1.22;microsoft.owin - 4.1.1;microsoft.aspnetcore.app.runtime.linux-arm - 3.1.8;microsoft.aspnetcore.app.runtime.linux-arm64 - 3.1.8;microsoft.aspnetcore.app.runtime.linux-musl-x64 - 3.1.8;microsoft.aspnetcore.app.runtime.linux-x64 - 3.1.8;microsoft.aspnetcore.app.runtime.osx-x64 - 3.1.8;microsoft.aspnetcore.app.runtime.win-arm - 3.1.8;microsoft.aspnetcore.app.runtime.win-x64 - 3.1.8;microsoft.aspnetcore.app.runtime.win-x86 - 3.1.8;microsoft.aspnetcore.app.runtime.linux-musl-arm64 - 3.1.8;microsoft.aspnetcore.app.runtime.win-arm64 - 3.1.8

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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