CVE-2020-16886: PowerShellGet Module WDAC Security Feature Bypass Vulnerability

Overview

Severity
Medium (CVSS 5.3)
CVSS Vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
Category
Security Feature Bypass
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2020-Oct
Released
2020-10-13
EPSS Score
0.41% (percentile: 61.4%)

Description

A security feature bypass vulnerability exists in the PowerShellGet V2 module. An attacker who successfully exploited this vulnerability could bypass WDAC (Windows Defender Application Control) policy and execute arbitrary code on a policy locked-down machine. An attacker must have administrator privileges to create a configuration that includes installing PowerShellGet V2 module onto a machine from the PowerShell Gallery. The WDAC policy must be configured to allow the module to run. After this is done, PowerShell script can be injected and run fully trusted, allowing the attacker arbitrary code execution on the machine. The update addresses the vulnerability by changing how URLs are processed.

Affected Products (1)

Other

  • 11798

Security Updates (1)

Revision History

  • 2020-10-13: Information published.