External risk intelligence

Microsoft Windows Security Bypass Vulnerability.

CVE advisoryKnown Exploit

CVE-2023-36584

A vulnerability in Windows' Mark of the Web security feature allows attackers to bypass warnings, potentially leading to a limited loss of integrity and availability. This impacts organizations using affected Windows systems and poses a risk if users interact with specially crafted files. Mitigation is recommended.

1Halo Surface Signal

Microsoft Windows 10 1507

before 10.0.10240.20232before 10.0.17763.4974before 10.0.19041.3570before 10.0.22000.2538before 10.0.22621.2428r2before 10.0.14393.6351before 10.0.20348.2031

External exposure likelihood

Halo Surface Signal score for CVE-2023-36584

This vulnerability affects the Windows Mark of the Web (MOTW) feature, which is a client-side security mechanism. It is not a network-accessible service or edge gateway. The vulnerability requires user interaction via files or web downloads on an endpoint, rather than being reachable through direct internet exposure.

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in the Windows Mark of the Web (MOTW) security feature allows attackers to bypass security warnings. This could lead to a limited loss of integrity and availability of security features on affected systems. The core issue lies in how Windows handles files downloaded from the internet, potentially deceiving users into opening malicious content without adequate warnings.

Windows Mark of the Web feature
Bypasses security warnings
Limited loss of integrity/availability

Attack Path

How an attacker could exploit the issue

This vulnerability allows an attacker to bypass security features in Windows by manipulating the Mark of the Web (MOTW) attribute. Organizations could face risks if their systems are targeted. The attack involves tricking a user into interacting with a specially crafted file.

Exposure condition: User interaction with a crafted file.
Attacker starting point: Unauthenticated.
Trigger and result: Bypass security features.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability affects the Windows Mark of the Web security feature. Exploitation could lead to a limited loss of data integrity and security feature availability. Organizations should consider the potential impact on business operations and security posture.

Low skill attacker, requires user interaction.
Business risk is moderate, treat as urgent.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

The organization faces a security risk due to a vulnerability in Microsoft Windows' Mark of the Web feature. This vulnerability could allow attackers to bypass security checks, potentially leading to a limited loss of integrity and availability of certain security features. Addressing this requires a systematic approach to identify, mitigate, and validate the fix across affected systems.

Find affected Microsoft Windows assets.
Reduce exposure or isolate risk.
Apply vendor fix, verify, and monitor.

Frequently asked questions

What is the Windows Mark of the Web (MOTW) security feature and how does CVE-2023-36584 impact it?

The Windows Mark of the Web (MOTW) is a security feature designed to identify files downloaded from the internet by attaching a special attribute. CVE-2023-36584 is a vulnerability that allows attackers to bypass this MOTW feature by using specially crafted files, potentially leading to a limited loss of integrity and availability of Windows security features.

What is the weakness class and trigger path for CVE-2023-36584?

CVE-2023-36584 is classified as a Security Feature Bypass vulnerability. The trigger path involves an attacker crafting specific files that deceive the Mark of the Web feature when a user interacts with them.

What is the scope negation and relevance of CVE-2023-36584?

The scope of this vulnerability is not expanded beyond the affected Windows security features, meaning it's a limited loss of integrity and availability. Its relevance lies in its potential to bypass security warnings for downloaded files, which could facilitate the execution of malicious content.

What is the practical response to the CVE-2023-36584 vulnerability affecting the Mark of the Web?

To address CVE-2023-36584, organizations should identify all affected Microsoft Windows assets, reduce exposure or isolate risks, and apply vendor-provided fixes, followed by verification and ongoing monitoring.

How does the Halo Surface Signal assess CVE-2023-36584's threat level?

Halo Surface Signal assesses CVE-2023-36584 as 'Very unlikely' to be exploited via direct internet exposure. This is because the vulnerability affects a client-side security mechanism (MOTW) and requires user interaction with files or downloads on an endpoint, rather than being directly reachable through network services.

References

Written by Nicholas Merritt

External-surface CVE analysis and Halo Surface Signal prioritization for Halo Threat Intelligence.