CVE-2020-16886

PowerShellGet Module WDAC Security Feature Bypass Vulnerability

Medium · published October 16, 2020

CVSS v3.1
5.3
EPSS
1%
Percentile
56.7
In the wild
Unconfirmed
What it is

<p>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.</p>

<p>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.</p>

<p>The update addresses the vulnerability by changing how URLs are processed.</p>

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00816 · 56.7th percentile
Published
2020-10-16T22:17Z
EPSS history
Timeline
  • 16 OCT 22:17Z
    PowerShellGet Module WDAC Security Feature Bypass Vulnerability
    cvelistv5