### Vulnerability Overview - **Vulnerability Type**: Command Injection - **Trigger Condition**: User-controlled input is concatenated into a command string and executed via the shell - **Root Cause**: When using `child_process.exec` to execute commands, user input is not isolated, allowing malicious input to be interpreted as shell commands ### Impact Scope - Affected Module: `mcp-code-review-server` in the MCP Server - Risk Component: Direct concatenation of user input (e.g., `specificFiles`) in the `exec` call - Potential Consequences: Attackers can inject arbitrary system commands, leading to server compromise, data leakage, or destruction ### Remediation Plan - **Core Measure**: Replace `child_process.exec` with `child_process.execFile` - **Technical Details**: - Pass commands and arguments using an array to avoid shell parsing - Remove shell-based output chaining operations (e.g., `&& cat`) - Standardize return values to uniformly point to the output file path - **Commit Message**: PR #5 — “fix: prevent command injection by replacing exec with execFile” ### POC / Exploit Code (from PR description) ```js // Before fix (dangerous): child_process.exec(`cat ${specificFiles} && echo "done"`, callback); // After fix (secure): child_process.execFile('cat', [specificFiles], (error, stdout, stderr) => { // Handle results }); ``` > Note: The actual POC requires constructing a malicious `specificFiles` value based on the specific context, such as passing shell command fragments like `; rm -rf /`.