🛡️ Sentinel: [CRITICAL] Fix Arbitrary Code Execution via subprocess.Popen in Excel Editor Script

[inherent-vice]

🚨 Severity: CRITICAL
💡 Vulnerability: Arbitrary Code Execution (ACE). The write_excel_cell function dynamically generated a Python script using f-strings with user-controlled input (sheet, cell, value) and executed it via subprocess.Popen([sys.executable, "-c", script]). This allowed potential code injection.
🎯 Impact: An attacker could manipulate the value or cell parameters to inject arbitrary Python code that would be executed in the context of the host application's system.
🔧 Fix: Refactored the dynamic script generation to use a static script instead. Input parameters are now passed securely to the subprocess's standard input (stdin) as a JSON string, which the static script safely reads using json.load(sys.stdin).
✅ Verification: Run python -m py_compile CouponCheck/tui/data/providers.py to ensure syntactical correctness and python scripts/manifest_consistency_check.py --no-screenshot-check for general validation, simulating the restricted environment where tkinter tests fail.

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PR created automatically by Jules for task 16487004068237491804 started by @agno7766

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6b568c09-70f0-43d2-94b2-2f113dbfeacf

📥 Commits

Reviewing files that changed from the base of the PR and between b18dfb2 and 34404bd.

📒 Files selected for processing (2)

• .jules/sentinel.md
• CouponCheck/tui/data/providers.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sentinel/fix-ace-subprocess-popen-16487004068237491804

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