🔒 Fix command injection vulnerability in subprocess shell=True usage

[IAmSoThirsty]

🎯 What: Fixed command injection vulnerability in src/app/infrastructure/vpn/backends.py and src/app/infrastructure/networking/wifi_controller.py caused by the use of shell=True in subprocess.run().
⚠️ Risk: Allowing subprocess.run() to execute commands with shell=True using untrusted input enables shell command injection, allowing arbitrary code execution.
🛡️ Solution: Replaced shell=True with shell=False in all cases where subprocess.run executes standard binaries/executables (e.g., where, wireguard, openvpn, rasdial, netsh). shell=False is inherently secure as it bypasses the shell entirely and uses the list-based argument passing mechanism directly, preventing injection. A new test suite was added in tests/test_subprocess_shell_fix.py to continuously verify these changes.

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PR created automatically by Jules for task 11088542195727080879 started by @IAmSoThirsty

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[codacy-production]

Not up to standards ⛔

🔴 Issues 2 high · 10 medium

Alerts:
⚠ 12 issues (≤ 0 issues of at least minor severity)

Results:
12 new issues

Category	Results
ErrorProne	4 medium
Security	6 medium 2 high

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🟢 Metrics 5 complexity

Metric	Results
Complexity	5

View in Codacy

_{TIP This summary will be updated as you push new changes. Give us feedback}

[gemini-code-assist]

Code Review

This pull request improves security by replacing shell=True with shell=False in subprocess.run calls across the WiFi controller and VPN backends, and introduces a new test suite to verify these changes. Feedback suggests maintaining consistency in backends.py by either explicitly setting shell=False or relying on the default value across all subprocess.run calls in the file to improve maintainability.

[gemini-code-assist]

While replacing shell=True with shell=False is a significant security improvement, there is now an inconsistency in how subprocess.run is called within this file. In the else block (line 250), shell=False is implicit, whereas here it is explicit. For better maintainability and clarity of security intent, it is recommended to either make it explicit everywhere or rely on the default False consistently when no shell features are required.