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Rewterz Threat Advisory – Microsoft PowerShell Core Multiple Security Bypass Vulnerabilities

Severity: Medium

Analysis Summary

Three security bypass vulnerabilities (CVE-2019-0627, CVE-2019-0631 and CVE-2019-0632) have been found in Microsoft PowerShell Core which could allow an attacker to bypass Device Guard. An attacker who successfully exploited any of these vulnerabilities could circumvent a User Mode Code Integrity (UMCI) policy on the machine. To exploit the vulnerabilities, an attacker would first have to access the local machine, and then run a malicious program. The update addresses the vulnerability by correcting how PowerShell Core validates User Mode Code Integrity policies.

Impact

Security Bypass

Affected Products

Microsoft PowerShell Core Version 6.1

Microsoft PowerShell Core Version 6.2

Remediation
Vendor has released updates for the affected product.

Update to version 6.1.3.