🛡️ Sentinel: [HIGH] Fix command injection in wifi script

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: Command Injection. In package/network/config/wifi-scripts/files-ucode/usr/share/ucode/wifi/iface.uc, the prepare function interpolates num_global_macaddr and data.mbssid directly into an fs.popen() command string without prior validation.
🎯 Impact: If an attacker can control the wireless interface configuration, they can supply malicious shell metacharacters (e.g., ;, &, |) in the mbssid or num_global_macaddr fields, resulting in arbitrary shell command execution with root privileges.
🔧 Fix: Mirrored the existing secure macaddr_base validation by checking that num_global_macaddr and data.mbssid contain only numeric digits (/[^0-9]/) before the fs.popen call, terminating the function with a warning if invalid characters are present.
✅ Verification: Ran sh test_ci.sh to ensure no syntax errors or regressions were introduced in the full OpenWrt environment.

Signed-off-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

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PR created automatically by Jules for task 14042704613632197757 started by @manupawickramasinghe

[google-labs-jules]

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