CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
50.4%
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 |
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].
You 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.
V1.0 (September 12, 2019): Advisory published.
Version 1.0
Last Updated 2019-09-12
Vendor | Product | Version | CPE |
---|---|---|---|
* | system.management.automation | * | cpe:2.3:a:*:system.management.automation:*:*:*:*:*:*:*:* |
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
50.4%