| Package | Affected versions | Patched versions |
|---|---|---|
| System.Management.Automation | ≥ 6.0.0, < 6.1.6≥ 6.2.0, < 6.2.3 | 6.1.66.2.3 |
| .net core | = 2.1= 2.2 | |
| powershell core | = 6.1= 6.2 |
A denial of service vulnerability exists when PowerShell Core or .NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a PowerShell Core scripts.
The update addresses the vulnerability by correcting how the .NET Core handles web requests.
System administrators are advised to update PowerShell Core to an unaffected version (see affected software.)
Please open a support question to discussion the PowerShell aspects of this advisory. Please use dotnet/announcements#121 for discussion of the .NET aspects this advisory.
The vulnerability affects PowerShell Core prior to the following versions:
| PowerShell Core Version | Fixed in |
|---|---|
| 6.1 | 6.1.6 |
| 6.2 | 6.2.3 |
| 7.0 | unaffected |
| 5 | unaffected |
If all of the following are true:
pwsh -v, then, check the version in the table in Affected Software to see if your version of PowerShell Core is affected.pwsh or pwsh.exe, then you are affected. This only existed for preview version of 6.0.Follow the instructions at Installing PowerShell Core to install the latest version of PowerShell Core.
If you have found a potential security issue in PowerShell Core, please email details to [email protected].
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site freeYou can ask questions about this issue on GitHub in the PowerShell organization. This is located at https://github.com/PowerShell/. The Announcements repo (https://github.com/PowerShell/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue where you can ask questions.
You can uninstall the newer version of PowerShell Core and install the previous version of PowerShell Core. This should be treated as a temporary measure. Therefore, the script or module should be updated to work with the patched version of PowerShell Core.
Paul Ryman of VMware Sydney Engineering Team
Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure.
See acknowledgments for more information.