Path Traversal in @patrik-simek/vm2: Sandbox Escape POC and Fix Analysis

Vulnerability Key Information Summary Vulnerability Overview Vulnerability Type: Path Traversal Description: This vulnerability exists in the library. Attackers can bypass sandbox restrictions and access the file system outside the sandbox by constructing malicious paths. Technical Details: The vulnerability is located in the function within the file. The path validation logic contains flaws when processing requests. Attackers can exploit path traversal sequences such as to breach the sandbox boundary. This vulnerability allows reading arbitrary files outside the sandbox. CVE Number: CVE-2024-XXXX (Specific number to be checked on the full page) Severity: Critical/High Impact Scope Affected Versions: = 3.9.5 Fix Measures: 1. Path Normalization: Perform strict normalization on input paths. 2. Boundary Checks: Add checks for sandbox boundaries to prevent path traversal. 3. Whitelist Validation: Implement a whitelist mechanism for module paths. 4. Symbolic Link Handling: Correctly handle symbolic links to prevent bypassing restrictions via symlinks. Temporary Mitigation Measures: POC Code Exploitation Steps: 1. Create a VM instance. 2. Execute inside the sandbox. 3. Use path traversal sequences (e.g., ) to read external files. 4. Successfully read sensitive files outside the sandbox. Security Recommendations 1. Immediate Upgrade: Upgrade to the fixed version as soon as possible. 2. Input Validation: Strictly validate all user-inputted paths. 3. Principle of Least Privilege: The sandbox environment should adhere to the principle of least privilege. 4. Monitoring and Auditing: Monitor file access behaviors within the sandbox. 5. Code Review: Review all code using vm2 to ensure correct usage. --- Note: The above information is compiled based on the screenshot content. Please refer to the official security advisory for specific version numbers, CVE numbers, and other detailed information.

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Path Traversal in @patrik-simek/vm2: Sandbox Escape POC and Fix Analysis

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