QID 91807

Date Published: 2021-08-11

QID 91807: Microsoft .NET Core and ASP.NET Core Security Update for August 2021

A denial of service vulnerability exists in .NET Core and Information Disclosure Vulnerability exists in both .NET Core and ASP .NET Core
This security update is rated Important for supported versions of .NET Core.

Affected versions:
.NET Core 2.1 before version 2.1.29
.NET Core 3.1 before version 3.1.18
.NET 5.0 before version 5.0.9
ASP.NET Core 2.1 before version 2.1.29
ASP.NET Core 3.1 before version 3.1.18
ASP.NET Core 5.0 before version 5.0.9

QID Detection Logic (Authenticated):
The qid looks for sub directories under %programfiles%\dotnet\shared\Microsoft.NETCore.App, %programfiles(x86)%\dotnet\shared\Microsoft.NETCore.App and checks for vulnerable versions in .version file on Windows.

Successful exploitation will lead to Denial of Service and Information Disclosure Vulnerability.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Low - 2.1 severity.

Solution

Customers are advised to refer to CVE-2021-26423, CVE-2021-34485 and CVE-2021-34532 for more details pertaining to this vulnerability.

Vendor References

CVE-2021-26423 - msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-26423
CVE-2021-34485 - msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-34485
CVE-2021-34532 - msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34532

CVEs related to QID 91807

CVE-2021-26423 | CVE-2021-34485 | CVE-2021-34532 |

Software Advisories

Advisory ID	Software	Link
CVE-2021-26423	Windows	msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26423
CVE-2021-34485	Windows	msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34485
CVE-2021-34532	Windows	msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34532

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