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Microsoft Warns of Critical PowerShell 7 Code Execution Vulnerability

Microsoft Warns of Critical PowerShell 7 Code Execution Vulnerability

Microsoft warns of a critical .NET Core remote code execution vulnerability in PowerShell 7 caused by how text encoding is performed in .NET 5 and .NET Core.

PowerShell provides a command-line shell, a framework, and a scripting language focused on automation for processing PowerShell cmdlets.

It runs on all major platforms, including Windows, Linux, and macOS, and it allows working with structured data such as JSON, CSV, and XML, as well as REST APIs and object models.

“Update as soon as possible”

The company says no mitigation measures are available to block exploitation of the security flaw tracked as CVE-2021-26701.

Customers are urged to install the updated PowerShell 7.0.6 and 7.1.3 versions as soon as possible to protect their systems from potential attacks.

Also Read: Compliance Course Singapore: Spotlight on the 3 Offerings

Microsoft’s initial advisory also provides developers with guidance on updating their apps to remove this vulnerability.

“The vulnerable package is System.Text.Encodings.Web. Upgrading your package and redeploying your app should be sufficient to address this vulnerability,” Microsoft explained in April when the security flaw was patched.

Any .NET 5, .NET Core, or .NET Framework-based app using a System.Text.Encodings.Web package version listed below is exposed to attacks.

Package NameVulnerable VersionsSecure Versions
System.Text.Encodings.Web4.0.0 –

While Visual Studio also contains the binaries for .NET, it is not vulnerable to this issue, according to Microsoft’s security advisory.

The update is offered to include the .NET files so that apps built using Visual Studio including .NET functionality will be protected from this security issue.

“If you have questions, ask them in GitHub, where the Microsoft development team and the community of experts are closely monitoring for new issues and will provide answers as soon as possible,” Microsoft added.

Microsoft has also recently announced that it would be making it easier to update PowerShell on Windows 10 and Windows Server by releasing future updates through the Microsoft Update service.

Also Read: PDPA Singapore Guidelines: 16 Key Concepts For Your Business

Update: Added a link to Microsoft’s warning to install the updated versions ASAP.



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