CVE-2022-41049: Windows 10 1507 Auth Bypass Vulnerability

CVE-2022-41049 Overview

CVE-2022-41049 is a Windows Mark of the Web (MOTW) Security Feature Bypass Vulnerability affecting multiple versions of Microsoft Windows operating systems. This vulnerability allows attackers to craft files that can bypass the Mark of the Web security protections, which are designed to warn users and restrict the execution of files downloaded from untrusted sources such as the internet.

Critical Impact

This vulnerability is actively exploited in the wild and has been added to CISA's Known Exploited Vulnerabilities (KEV) catalog. Successful exploitation allows malicious files to bypass Windows security warnings and potentially execute without user awareness of the risk.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 20H2, 21H1, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2)
• Microsoft Windows Server 2016
• Microsoft Windows Server 2019
• Microsoft Windows Server 2022

Discovery Timeline

• 2022-11-09 - CVE-2022-41049 published to NVD
• 2025-10-30 - Last updated in NVD database

Technical Details for CVE-2022-41049

Vulnerability Analysis

The Mark of the Web (MOTW) is a critical Windows security feature that tags files downloaded from the internet with a special NTFS alternate data stream (ADS) named Zone.Identifier. When a file contains this mark, Windows applies additional security restrictions, such as displaying SmartScreen warnings, blocking Office macros by default, and prompting users before executing potentially dangerous content.

CVE-2022-41049 allows attackers to craft specially structured files or archives that fail to properly propagate the MOTW when extracted or processed. This means files that should be marked as originating from the internet can evade this protective tagging, thereby bypassing security warnings and restrictions that would normally alert users to potentially malicious content.

The vulnerability has a significant impact on enterprise security postures because the MOTW is a foundational security control that other security mechanisms depend upon. When bypassed, attack chains that rely on social engineering users to download and execute malicious files become significantly more effective.

Root Cause

The vulnerability stems from improper handling of the Zone.Identifier alternate data stream during certain file operations. Specifically, when files are contained within specially crafted archives or processed through certain Windows components, the MOTW is not correctly propagated to extracted files. This failure in the security tagging mechanism allows files from untrusted sources to appear as locally-created content, circumventing the security protections designed to protect users from internet-downloaded malware.

Attack Vector

The attack vector for CVE-2022-41049 requires network-based delivery and user interaction. A typical attack scenario involves:

1. An attacker creates a specially crafted archive file (such as a ZIP archive) containing malicious payloads
2. The archive is delivered to the victim via email attachment, malicious website download, or other network-based delivery mechanisms
3. When the victim extracts the archive contents, the extracted files do not inherit the MOTW despite the archive itself being tagged as downloaded from the internet
4. The malicious files can then execute without triggering the usual security warnings, increasing the likelihood of successful compromise

This attack pattern is particularly dangerous in phishing campaigns where attackers rely on users opening and executing downloaded files. The bypass of MOTW removes a critical layer of user warning that would otherwise prompt caution.

Detection Methods for CVE-2022-41049

Indicators of Compromise

• Files executing from user download directories without Zone.Identifier alternate data streams
• Archive files (ZIP, ISO, IMG) from external sources containing executables that lack MOTW markers after extraction
• Unusual child process spawning from archive extraction utilities without corresponding SmartScreen events
• Office documents executing macros without Protected View engagement despite being downloaded from external sources

Detection Strategies

• Monitor for executable file creation in common download locations that lack the Zone.Identifier ADS
• Deploy EDR rules to detect extraction of archive contents where child files do not inherit MOTW from parent archives
• Implement YARA rules to identify known archive structures that exploit MOTW propagation failures
• Audit SmartScreen bypass events where downloaded executables run without triggering expected security prompts

Monitoring Recommendations

• Enable and centralize Windows Security event logs, particularly events related to SmartScreen and application execution
• Monitor NTFS alternate data stream operations, especially creation and removal of Zone.Identifier streams
• Implement network monitoring to correlate file downloads with subsequent execution events lacking MOTW triggers
• Deploy SentinelOne agents configured to detect and alert on MOTW bypass attempts and suspicious file extraction behaviors

How to Mitigate CVE-2022-41049

Immediate Actions Required

• Apply the November 2022 security updates from Microsoft immediately across all affected Windows systems
• Review and update email security gateways to strip or block potentially dangerous archive types pending patch deployment
• Enable Attack Surface Reduction (ASR) rules to block execution of potentially obfuscated scripts and untrusted executables
• Educate users about the increased risk of phishing attacks exploiting this vulnerability

Patch Information

Microsoft released security patches addressing CVE-2022-41049 as part of their November 2022 Patch Tuesday updates. Organizations should apply the appropriate cumulative update for their Windows version. For detailed patch information and download links, refer to the Microsoft Security Update Guide. Given that this vulnerability is listed in the CISA Known Exploited Vulnerabilities Catalog, federal agencies and organizations following CISA guidance are required to prioritize remediation.

Workarounds

• Configure email security solutions to quarantine or block archive attachments (ZIP, ISO, IMG, VHD) from external senders until patches are applied
• Use Group Policy to restrict execution of scripts and executables from user-writable directories
• Implement application whitelisting solutions to prevent unauthorized executables from running regardless of MOTW status
• Consider blocking ISO and IMG file mounting through Group Policy as these formats are commonly used in MOTW bypass attacks

# PowerShell: Check for files missing Zone.Identifier in Downloads folder
Get-ChildItem -Path "$env:USERPROFILE\Downloads" -Recurse -File | 
ForEach-Object {
    $zoneId = Get-Item -Path "$($_.FullName):Zone.Identifier" -ErrorAction SilentlyContinue
    if (-not $zoneId) {
        Write-Output "Missing MOTW: $($_.FullName)"
    }
}