Vulnerability-Lookup

VAR-202009-0169

Vulnerability from variot - Updated: 2024-01-03 13:38

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.

. Both Microsoft .NET Core and Microsoft ASP.NET Core are products of Microsoft Corporation of the United States. .NET Core is a free open source development platform. The platform has features such as multi-language support and cross-platform. Microsoft ASP.NET Core is a cross-platform open source framework. The framework is used to build cloud-based applications such as web applications, IoT applications, and mobile backends. Attackers can use this vulnerability to set a second cookie. The following products and versions are affected: ASP.NET Core 2.1 version, ASP.NET Core 3.1 version. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Important: .NET Core 3.1 security and bugfix update for Red Hat Enterprise Linux Advisory ID: RHSA-2020:3697-01 Product: .NET Core on Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2020:3697 Issue date: 2020-09-08 CVE Names: CVE-2020-1045 ==================================================================== 1. Summary:

An update for rh-dotnet31-dotnet is now available for .NET Core on Red Hat Enterprise Linux.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Relevant releases/architectures:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 .NET Core on Red Hat Enterprise Linux Server (v. 7) - x86_64 .NET Core on Red Hat Enterprise Linux Workstation (v. 7) - x86_64

It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Package List:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7):

Source: rh-dotnet31-dotnet-3.1.108-1.el7.src.rpm

x86_64: rh-dotnet31-aspnetcore-runtime-3.1-3.1.8-1.el7.x86_64.rpm rh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm rh-dotnet31-dotnet-3.1.108-1.el7.x86_64.rpm rh-dotnet31-dotnet-apphost-pack-3.1-3.1.8-1.el7.x86_64.rpm rh-dotnet31-dotnet-debuginfo-3.1.108-1.el7.x86_64.rpm rh-dotnet31-dotnet-host-3.1.8-1.el7.x86_64.rpm rh-dotnet31-dotnet-hostfxr-3.1-3.1.8-1.el7.x86_64.rpm rh-dotnet31-dotnet-runtime-3.1-3.1.8-1.el7.x86_64.rpm rh-dotnet31-dotnet-sdk-3.1-3.1.108-1.el7.x86_64.rpm rh-dotnet31-dotnet-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm rh-dotnet31-dotnet-templates-3.1-3.1.108-1.el7.x86_64.rpm rh-dotnet31-netstandard-targeting-pack-2.1-3.1.108-1.el7.x86_64.rpm

.NET Core on Red Hat Enterprise Linux Server (v. 7):

Source: rh-dotnet31-dotnet-3.1.108-1.el7.src.rpm

.NET Core on Red Hat Enterprise Linux Workstation (v. 7):

Source: rh-dotnet31-dotnet-3.1.108-1.el7.src.rpm

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/

References:

https://access.redhat.com/security/cve/CVE-2020-1045 https://access.redhat.com/security/updates/classification/#important

Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce

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    "data": "\u003cp\u003eA security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names.\u003c/p\u003e\n\u003cp\u003eThe 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.\u003c/p\u003e\n\u003cp\u003eThe security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.\u003c/p\u003e\n. Both Microsoft .NET Core and Microsoft ASP.NET Core are products of Microsoft Corporation of the United States. .NET Core is a free open source development platform. The platform has features such as multi-language support and cross-platform. Microsoft ASP.NET Core is a cross-platform open source framework. The framework is used to build cloud-based applications such as web applications, IoT applications, and mobile backends. Attackers can use this vulnerability to set a second cookie. The following products and versions are affected: ASP.NET Core 2.1 version, ASP.NET Core 3.1 version. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n====================================================================                   \nRed Hat Security Advisory\n\nSynopsis:          Important: .NET Core 3.1 security and bugfix update for Red Hat Enterprise Linux\nAdvisory ID:       RHSA-2020:3697-01\nProduct:           .NET Core on Red Hat Enterprise Linux\nAdvisory URL:      https://access.redhat.com/errata/RHSA-2020:3697\nIssue date:        2020-09-08\nCVE Names:         CVE-2020-1045\n====================================================================\n1. Summary:\n\nAn update for rh-dotnet31-dotnet is now available for .NET Core on Red Hat\nEnterprise Linux. \n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available for each vulnerability\nfrom the CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\n.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64\n.NET Core on Red Hat Enterprise Linux Server (v. 7) - x86_64\n.NET Core on Red Hat Enterprise Linux Workstation (v. 7) - x86_64\n\n3. It implements a subset of the\n.NET framework APIs and several new APIs, and it includes a CLR\nimplementation. \n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Package List:\n\n.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7):\n\nSource:\nrh-dotnet31-dotnet-3.1.108-1.el7.src.rpm\n\nx86_64:\nrh-dotnet31-aspnetcore-runtime-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-apphost-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-debuginfo-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-host-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-hostfxr-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-runtime-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-sdk-3.1-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-templates-3.1-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-netstandard-targeting-pack-2.1-3.1.108-1.el7.x86_64.rpm\n\n.NET Core on Red Hat Enterprise Linux Server (v. 7):\n\nSource:\nrh-dotnet31-dotnet-3.1.108-1.el7.src.rpm\n\nx86_64:\nrh-dotnet31-aspnetcore-runtime-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-apphost-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-debuginfo-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-host-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-hostfxr-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-runtime-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-sdk-3.1-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-templates-3.1-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-netstandard-targeting-pack-2.1-3.1.108-1.el7.x86_64.rpm\n\n.NET Core on Red Hat Enterprise Linux Workstation (v. 7):\n\nSource:\nrh-dotnet31-dotnet-3.1.108-1.el7.src.rpm\n\nx86_64:\nrh-dotnet31-aspnetcore-runtime-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-apphost-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-debuginfo-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-host-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-hostfxr-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-runtime-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-sdk-3.1-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-targeting-pack-3.1-3.1.8-1.el7.x86_64.rpm\nrh-dotnet31-dotnet-templates-3.1-3.1.108-1.el7.x86_64.rpm\nrh-dotnet31-netstandard-targeting-pack-2.1-3.1.108-1.el7.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2020-1045\nhttps://access.redhat.com/security/updates/classification/#important\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. 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CVE-2020-1045 (GCVE-0-2020-1045)

Vulnerability from cvelistv5 – Published: 2020-09-11 00:00 – Updated: 2024-11-18 16:25

Title

Microsoft ASP.NET Core Security Feature Bypass Vulnerability

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-01-10 18:21 UTC

CWE

Security Feature Bypass

Assigner

microsoft mitre root Scorecard

References

6 references

URL	Tags
https://portal.msrc.microsoft.com/en-US/security-…
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://github.com/dotnet/core/blob/main/release-…
https://security.snyk.io/vuln/SNYK-RHEL8-DOTNET-1439600
https://access.redhat.com/errata/RHSA-2020:3699

Impacted products

2 products

Vendor	Product	Version
Microsoft	ASP.NET Core 2.1	Affected: 2.0 , < publication (custom) cpe:2.3:a:microsoft:asp.net_core:2.1:::::::
Microsoft	ASP.NET Core 3.1	Affected: 3.0 , < publication (custom) cpe:2.3:a:microsoft:asp.net_core:3.1:::::::*

Date Public

2020-09-08 07:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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VAR-202009-0169

CVE-2020-1045 (GCVE-0-2020-1045)

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