CVE-2020-16886 Explained : Impact and Mitigation
Learn about CVE-2020-16886, a security feature bypass vulnerability in PowerShellGet V2 module allowing arbitrary code execution. Find mitigation steps and affected systems here.
A security feature bypass vulnerability in the PowerShellGet V2 module allows attackers to execute arbitrary code on a policy locked-down machine by bypassing WDAC policy.
Understanding CVE-2020-16886
This CVE involves a vulnerability in the PowerShellGet V2 module that enables attackers to bypass WDAC policy and run arbitrary code on a locked-down machine.
What is CVE-2020-16886?
This CVE refers to a security feature bypass vulnerability in the PowerShellGet V2 module, allowing attackers with administrator privileges to execute arbitrary code on a machine with a configured WDAC policy.
The Impact of CVE-2020-16886
- Attackers can bypass WDAC policy and run arbitrary code on a locked-down machine.
Technical Details of CVE-2020-16886
This section provides technical details about the vulnerability.
Vulnerability Description
The vulnerability allows attackers to bypass WDAC policy and execute arbitrary code by injecting PowerShell scripts.
Affected Systems and Versions
- Vendor: Microsoft
- Product: PowerShellGet 2.2.5
- Platforms: Unknown
- Versions Affected: 1.0.0 (custom version)
Exploitation Mechanism
- Attacker with admin privileges installs PowerShellGet V2 module from PowerShell Gallery
- WDAC policy must allow the module to run
- Inject PowerShell script to execute arbitrary code
Mitigation and Prevention
Protect systems from CVE-2020-16886 with the following steps:
Immediate Steps to Take
- Apply the update addressing the vulnerability
- Restrict administrator privileges to prevent unauthorized installations
Long-Term Security Practices
- Regularly update and patch systems
- Implement least privilege access controls
Patching and Updates
- Update PowerShellGet module to the latest version
- Monitor and enforce WDAC policies to restrict module execution