CVE-2024-38178: Windows 10 1507 Scripting Engine RCE Flaw

CVE-2024-38178 Overview

CVE-2024-38178 is a memory corruption vulnerability affecting the Windows Scripting Engine across a wide range of Microsoft Windows operating systems. This vulnerability stems from a type confusion issue (CWE-843) within the scripting engine, which can allow an attacker to execute arbitrary code in the context of the current user. Successful exploitation requires user interaction, typically by convincing a target to visit a specially crafted webpage or open a malicious document that leverages the vulnerable scripting engine component.

Critical Impact

This vulnerability is actively exploited in the wild and has been added to the CISA Known Exploited Vulnerabilities (KEV) catalog. Organizations should treat patching as a high priority given the confirmed exploitation activity targeting Windows systems.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2, 23H2, 24H2)
• Microsoft Windows Server 2012 R2, 2016, 2019, 2022, and 2022 23H2

Discovery Timeline

• August 13, 2024 - CVE-2024-38178 published to NVD
• October 28, 2025 - Last updated in NVD database

Technical Details for CVE-2024-38178

Vulnerability Analysis

This vulnerability exists within the Windows Scripting Engine, a core component responsible for parsing and executing scripts in Internet Explorer mode and legacy applications that rely on the JScript engine. The flaw is classified as a type confusion vulnerability, where the scripting engine improperly handles certain objects in memory, leading to corruption that can be leveraged for code execution.

The attack requires network access and user interaction—typically through social engineering tactics that lure victims to malicious web content. Once the victim interacts with the crafted content while using Internet Explorer mode in Microsoft Edge or a legacy application, the attacker can achieve code execution with the privileges of the current user. If the user has administrative privileges, a successful exploit could result in complete system compromise.

Root Cause

The root cause of CVE-2024-38178 is a type confusion flaw (CWE-843) in the scripting engine. Type confusion occurs when a program allocates or initializes a resource using one type but later accesses that resource using an incompatible type. In this case, the scripting engine fails to properly validate object types during script execution, allowing an attacker to manipulate memory in unexpected ways. This type of memory corruption primitive can be chained with other techniques to achieve reliable code execution.

Attack Vector

The attack vector for CVE-2024-38178 is network-based and requires user interaction. A threat actor would typically:

1. Craft malicious web content containing specially designed JavaScript or VBScript code
2. Host the content on a compromised or attacker-controlled website
3. Deliver the malicious link to targets via phishing emails, social media, or other social engineering methods
4. Wait for victims using Internet Explorer mode or legacy scripting applications to access the content
5. Execute arbitrary code once the scripting engine processes the malicious content

The vulnerability specifically targets scenarios where users have Internet Explorer mode enabled in Microsoft Edge or are using applications that embed the legacy scripting engine. Organizations that have disabled Internet Explorer mode and legacy script execution have reduced attack surface for this vulnerability.

Detection Methods for CVE-2024-38178

Indicators of Compromise

• Unexpected process spawning from iexplore.exe or Edge processes running in IE mode
• Anomalous network connections originating from scripting engine host processes
• Memory corruption artifacts or crash dumps associated with jscript.dll or vbscript.dll
• Suspicious JavaScript or VBScript execution patterns in browser logs

Detection Strategies

• Monitor for unusual child process creation from Internet Explorer or Edge IE mode processes
• Implement endpoint detection rules for memory corruption exploitation techniques such as heap spraying and ROP chain execution
• Deploy web content filtering to block access to known malicious domains distributing exploit code
• Enable Windows Defender Exploit Guard Attack Surface Reduction rules targeting script execution

Monitoring Recommendations

• Enable enhanced logging for scripting engine activity and browser process behavior
• Configure SIEM alerts for exploitation indicators associated with CVE-2024-38178
• Monitor the CISA KEV Catalog for updated threat intelligence
• Review endpoint telemetry for signs of post-exploitation activity following scripting engine compromise

How to Mitigate CVE-2024-38178

Immediate Actions Required

• Apply the Microsoft security update for CVE-2024-38178 immediately on all affected Windows systems
• Disable Internet Explorer mode in Microsoft Edge for users who do not require legacy web application compatibility
• Restrict administrative privileges to limit the impact of successful exploitation
• Educate users about phishing risks and the dangers of clicking unknown links

Patch Information

Microsoft has released security updates addressing CVE-2024-38178 as part of the August 2024 Patch Tuesday release. Detailed patch information, including specific KB articles for each affected Windows version, is available in the Microsoft Security Update Guide for CVE-2024-38178. Organizations should prioritize deployment of these updates given the confirmed exploitation in the wild and CISA KEV listing.

Workarounds

• Disable Internet Explorer mode in Microsoft Edge via Group Policy: Computer Configuration > Administrative Templates > Microsoft Edge > Configure Internet Explorer integration set to "Disabled"
• Block access to legacy scripting engines by configuring Software Restriction Policies or AppLocker rules
• Implement network segmentation to limit lateral movement in case of successful exploitation
• Deploy browser isolation solutions for high-risk users who must access untrusted web content

# Disable IE mode via registry (requires administrative privileges)
reg add "HKLM\SOFTWARE\Policies\Microsoft\Edge" /v "InternetExplorerIntegrationLevel" /t REG_DWORD /d 0 /f

# Enable Attack Surface Reduction rule to block script execution in browsers
Set-MpPreference -AttackSurfaceReductionRules_Ids d4f940ab-401b-4efc-aadc-ad5f3c50688a -AttackSurfaceReductionRules_Actions Enabled