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Microsoft Security Advisory CVE-2019-0820: .NET Core Denial of Service Vulnerability #15
Microsoft Security Advisory CVE-2019-0820: .NET Core Denial of Service Vulnerability
System administrators are advised to update PowerShell Core to an unaffected version (see affected software.)
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET Core 2.1.
A denial of service vulnerability exists when .NET Core improperly process RegEx strings. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET application.
A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to a .NET Core application.
The update addresses the vulnerability by correcting how .NET Core applications handle RegEx string processing.
The vulnerability affects PowerShell Core prior to the following versions:
How do I know if I am affected?
If all of the following are true:
How do I update to an unaffected version?
Follow the instructions at Installing PowerShell Core to install the latest version of PowerShell Core.
Reporting Security Issues
If you have found a potential security issue in PowerShell Core,
You can ask questions about this issue on GitHub in the PowerShell organization.
What if the update breaks my script or module?
You can uninstall the newer version of PowerShell Core and install the previous version of PowerShell Core.
Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure.
See acknowledgments for more information.
V1.0 (May 21, 2019): Advisory published.