.NET Framework Security Feature Bypass Vulnerability

Source data

Overview

Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.

Impact & technical details

Security Feature Bypass

What kind of security feature could be bypassed by successfully exploiting this vulnerability? An attacker who successfully exploits this vulnerability could bypass Windows Defender Application Control (WDAC) enforcement. This could lead to the ability to run unauthorized applications on target systems.

How could an attacker exploit this vulnerability? An authenticated attacker could place a specially crafted .NET assembly on an affected system and register it for loading by a protected process. Successful exploitation could bypass Windows Defender Application Control restrictions and allow the attacker to execute code within the protected process. User interaction is not required.

CVSS base score

8.8 / 10

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.

Affected products

• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
• Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019
• Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2
• Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2
• Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019

Source guidance

Remediation

The source provides update references without a separate remediation summary. Review the applicable update links below.

At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.

Authoritative sources & updates

Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.

• Microsoft Security Response Center (opens in a new tab)
• Microsoft security update · 5126868 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127666 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127685 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127683 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127687 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127667 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127668 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127684 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127686 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127688 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127689 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127690 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127691 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127692 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127693 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5127694 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)