Horizon Alert
Summary of the vulnerability and why it matters
This advisory highlights a critical vulnerability in vm2, a Node.js library used for creating secure, isolated JavaScript environments. The vulnerability allows malicious code to escape the sandbox and execute commands with broad system access, bypassing security restrictions. The primary concern is to confirm if this library is in use and if it is exposed to potential exploitation.
- Code can break out of secure environments.
- Confirms if this library is being used.
- Understand potential impact and verify use.
Attack Path
How an attacker could exploit the issue
An attacker could leverage a sandbox escape vulnerability within the NodeVM feature of vm2. This occurs when an attacker manipulates the `__proto__` getter/setter via `console._stdout` or `console._stderr`, allowing them to overwrite `EventEmitter.prototype.emit`. By triggering process events, the attacker can bypass code generation restrictions and execute arbitrary code with the privileges of the running process.
- No authentication or special access is required.
- Triggered by manipulating console output.
- Risk of arbitrary code execution.
Live Threat
Current exploitation, exposure, and threat context
A sandbox escape vulnerability in vm2 could allow attackers to execute code with process-level permissions, potentially impacting the host system when the library is used to execute untrusted code.
- Code execution with process context.
- Bypassing sandbox restrictions on untrusted code.
- Compromise of the host system.
Operational Fix
Recommended remediation, mitigation, and detection steps
The vm2 library, a Node.js sandbox environment, has a critical vulnerability allowing for sandbox escapes. In a real-world scenario, the application development team or platform team responsible for integrating vm2 into their services would likely own this issue. The first practical step is to identify all applications that utilize vm2, confirm their business criticality and exposure, and then plan remediation based on the identified risk.
- Application development teams should own the issue.
- Verify vm2 usage and deployment scope.
- Plan remediation based on risk and criticality.
