ASP.NET Core and Visual Studio Denial of Service Vulnerability

The remote NewStart CGSL host, running version MAIN 6.02, has dotnet3.1 packages installed that are affected by a vulnerability:

  - ASP.NET Core and Visual Studio Denial of Service Vulnerability (CVE-2021-1723)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2021:0095 advisory.

  - dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2 (CVE-2021-1723)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CESA-2021:0094 advisory.

  - dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2 (CVE-2021-1723)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 33 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2021-fb078913dd advisory.

  - ASP.NET Core and Visual Studio Denial of Service Vulnerability (CVE-2021-1723)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 32 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2021-77a4202036 advisory.

  - ASP.NET Core and Visual Studio Denial of Service Vulnerability (CVE-2021-1723)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Microsoft .NET Core installation on the remote host is version 3.1.x < 3.1.11 or 5.x prior to 5.0.2. It is, therefore, affected by a denial of service (DoS) vulnerability in the way Kestrel parses HTTP/2 requests. An unauthenticated, remote attacker can exploit this issue, by sending a specially crafted requests to the .NET Core application, to cause a DoS condition.

The Microsoft ASP.NET Core installation on the remote host is version 3.1.x < 3.1.11 or 5.x prior to 5.0.2. It is, therefore, affected by a denial of service (DoS) vulnerability in the way Kestrel parses HTTP/2 requests. An unauthenticated, remote attacker can exploit this issue, by sending a specially crafted requests to the ASP.NET Core application, to cause a DoS condition.

The Microsoft .NET Core SDK installation on the remote host is version 3.1.x prior to 3.1.111, 3.1.2xx prior to 3.1.405, or 5.x prior to 5.0.102. It is, therefore, affected by a denial of service (DoS) vulnerability in the way Kestrel parses HTTP/2 requests. An unauthenticated, remote attacker can exploit this issue, by sending a specially crafted requests to the .NET Core application, to cause a DoS condition.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-0094 advisory.

    [5.0.102-2.0.1]
    - Add support for new Oracle release

    [5.0.102-2]
    - Rebuild with updated tests
    - Resolves: RHBZ#1912684

    [5.0.102-1]
    - Update to .NET SDK 5.0.102 and Runtime 5.0.2
    - Resolves: RHBZ#1912684

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-0095 advisory.

    [3.1.111-1.0.1]
    - Update patch to support 8.3 (alexander.burmashev@oracle.com)
    - support OL release scheme (alexander.burmashev@oracle.com)

    [3.1.111-1]
    - Update to .NET Core SDK 3.1.111 and Runtime 3.1.11
    - Resolves: RHBZ#1907633

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Microsoft Visual Studio Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - An elevation of privilege vulnerability. An attacker can     exploit this to gain elevated privileges.
    (CVE-2021-1651, CVE-2021-1680)

  - A denial of service (DoS) vulnerability. An attacker can     exploit this issue to cause the affected component to     deny system or application services. (CVE-2021-1723)

  - A remote code execution vulnerability. An attacker can     exploit this to bypass authentication and execute     unauthorized arbitrary commands. (CVE-2020-26870)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:0114 advisory.

    .NET Core is a managed-software framework. It implements a subset of the .NET framework APIs and several     new APIs, and it includes a CLR implementation.

    New versions of .NET Core that address a security vulnerability are now available. The updated versions     are .NET Core SDK 3.1.111 and .NET Core Runtime 3.1.11.

    Security Fix(es):

    * dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2 (CVE-2021-1723)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:0095 advisory.

    .NET Core is a managed-software framework. It implements a subset of the .NET framework APIs and several     new APIs, and it includes a CLR implementation.

    New versions of .NET Core that address a security vulnerability are now available. The updated versions     are .NET Core SDK 3.1.111 and .NET Core Runtime 3.1.11.

    Security Fix(es):

    * dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2 (CVE-2021-1723)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:0096 advisory.

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

    New versions of .NET that address a security vulnerability are now available. The updated versions are     .NET SDK 5.0.102 and .NET Runtime 5.0.2.

    Security Fix(es):

    * dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2 (CVE-2021-1723)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:0094 advisory.

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

    New versions of .NET that address a security vulnerability are now available. The updated versions are     .NET SDK 5.0.102 and .NET Runtime 5.0.2.

    Security Fix(es):

    * dotnet: ASP.NET Core Callbacks outside of locks cause Krestel deadlock when using HTTP2 (CVE-2021-1723)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
154599	NewStart CGSL MAIN 6.02 : dotnet3.1 Vulnerability (NS-SA-2021-0125)	Nessus	NewStart CGSL Local Security Checks	high
146033	CentOS 8 : dotnet3.1 (CESA-2021:0095)	Nessus	CentOS Local Security Checks	high
145931	CentOS 8 : dotnet5.0 (CESA-2021:0094)	Nessus	CentOS Local Security Checks	high
145260	Fedora 33 : dotnet3.1 (2021-fb078913dd)	Nessus	Fedora Local Security Checks	high
145254	Fedora 32 : dotnet3.1 (2021-77a4202036)	Nessus	Fedora Local Security Checks	high
145041	Security Update for .NET Core (January 2021)	Nessus	Windows	high
145040	Security Update for Microsoft ASP.NET Core (January 2021)	Nessus	Windows	high
145039	Security Update for .NET Core SDK (January 2021)	Nessus	Windows	high
145036	Oracle Linux 8 : dotnet5.0 (ELSA-2021-0094)	Nessus	Oracle Linux Local Security Checks	high
145006	Oracle Linux 8 : dotnet3.1 (ELSA-2021-0095)	Nessus	Oracle Linux Local Security Checks	high
144977	Security Updates for Microsoft Visual Studio Products (January 2021)	Nessus	Windows : Microsoft Bulletins	medium
144939	RHEL 7 : .NET Core 3.1 on Red Hat Enterprise Linux (RHSA-2021:0114)	Nessus	Red Hat Local Security Checks	high
144935	RHEL 8 : dotnet3.1 (RHSA-2021:0095)	Nessus	Red Hat Local Security Checks	high
144934	RHEL 7 : .NET 5.0 on Red Hat Enterprise Linux (RHSA-2021:0096)	Nessus	Red Hat Local Security Checks	high
144931	RHEL 8 : dotnet5.0 (RHSA-2021:0094)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2021-1723

high

Tenable Plugins

high

high

high

high

high

high

high

high

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medium

high

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high