CVE-2024-23741: Vercel Hyper RCE Vulnerability

CVE-2024-23741 Overview

CVE-2024-23741 is a critical remote code execution vulnerability affecting Vercel Hyper terminal application on macOS. The vulnerability exists in versions 3.4.1 and earlier, allowing remote attackers to execute arbitrary code by exploiting the RunAsNode and enableNodeClilnspectArguments settings. This is a significant security flaw in the Electron-based terminal emulator that could allow complete system compromise.

Critical Impact

Remote attackers can achieve arbitrary code execution on affected macOS systems running vulnerable versions of Hyper terminal, potentially leading to full system compromise without requiring user privileges or interaction.

Affected Products

• Vercel Hyper version 3.4.1 and earlier
• Apple macOS (as the affected platform)
• Electron-based applications using similar RunAsNode configurations

Discovery Timeline

• 2024-01-28 - CVE-2024-23741 published to NVD
• 2025-06-03 - Last updated in NVD database

Technical Details for CVE-2024-23741

Vulnerability Analysis

This vulnerability is classified as Code Injection (CWE-94) and affects Electron-based applications that improperly handle Node.js execution settings. The Hyper terminal, built on the Electron framework, contains insecure configuration options that can be abused by attackers to inject and execute malicious code within the application's context.

The exploitation leverages environment variables and Electron-specific settings that control how Node.js processes are spawned within the application. When these settings are manipulated, an attacker can force the application to execute arbitrary JavaScript code with the same privileges as the Hyper application itself.

The Electron team has published a statement regarding RunAsNode CVEs that provides context on this class of vulnerabilities affecting Electron applications.

Root Cause

The root cause of this vulnerability lies in the insecure handling of the ELECTRON_RUN_AS_NODE environment variable and the enableNodeClilnspectArguments configuration option. When Electron applications do not properly restrict these settings, they can be exploited to spawn Node.js processes that execute attacker-controlled code. The Hyper terminal application failed to implement proper security controls around these Electron features, allowing malicious actors to bypass the application's intended execution boundaries.

Attack Vector

The attack vector for CVE-2024-23741 is network-based, requiring no privileges or user interaction. An attacker can exploit this vulnerability by crafting malicious content that, when processed by the Hyper terminal application, triggers the vulnerable code path. The exploitation involves manipulating environment variables or settings that cause the Electron application to spawn a Node.js process with attacker-controlled arguments or scripts.

The attack flow typically involves:

1. Setting the ELECTRON_RUN_AS_NODE environment variable to enable Node.js execution mode
2. Leveraging the enableNodeClilnspectArguments setting to inject malicious code or scripts
3. Executing arbitrary JavaScript code within the Node.js runtime context

Technical details and proof-of-concept code are available in the GitHub PoC Repository.

Detection Methods for CVE-2024-23741

Indicators of Compromise

• Unexpected child processes spawned by the Hyper application with Node.js execution flags
• Presence of ELECTRON_RUN_AS_NODE environment variable set in process context
• Unusual network connections originating from the Hyper terminal process
• Suspicious JavaScript files or scripts executed within the Hyper application directory

Detection Strategies

• Monitor for process trees showing Hyper spawning unexpected child processes with --inspect or similar Node.js debugging arguments
• Implement endpoint detection rules for environment variable manipulation targeting Electron applications
• Deploy behavioral analysis to detect code injection patterns in terminal emulator applications
• Review system logs for unusual Hyper application behavior or privilege usage patterns

Monitoring Recommendations

• Enable enhanced logging for Electron-based applications on macOS endpoints
• Implement file integrity monitoring for Hyper configuration files and application directories
• Configure network monitoring to detect anomalous outbound connections from terminal applications
• Deploy EDR solutions with Electron application behavioral analysis capabilities

How to Mitigate CVE-2024-23741

Immediate Actions Required

• Update Vercel Hyper to the latest available version that addresses this vulnerability
• Review and restrict environment variable access for Electron-based applications
• Consider temporarily disabling or uninstalling Hyper on critical systems until patched
• Implement application whitelisting to prevent unauthorized code execution

Patch Information

Users should upgrade to a version of Hyper newer than 3.4.1 that addresses this vulnerability. Check the official Vercel Hyper releases for security updates. The Electron Blog Statement provides additional context on mitigations for this class of vulnerabilities.

Workarounds

• Disable the ELECTRON_RUN_AS_NODE functionality at the system level where possible
• Implement strict application sandboxing for Electron-based applications on macOS
• Use alternative terminal applications until a patched version of Hyper is available
• Apply macOS security policies to restrict environment variable manipulation for applications

# Configuration example - Restrict ELECTRON_RUN_AS_NODE at system level
# Add to system environment profile to prevent exploitation
launchctl setenv ELECTRON_RUN_AS_NODE ""

# Verify Hyper version installed
# Check if running vulnerable version <= 3.4.1
ls -la /Applications/Hyper.app/Contents/Info.plist