Security vulnerabilities and automated fixes for rpcd issues
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A critical command injection vulnerability in the `luci.natflow` RPC handler allowed authenticated attackers to pass arbitrary shell metacharacters through the `kick_user`, `block_user`, and `allow_user` functions, which forwarded the unsanitized input directly to `sys.call()` as root. The fix adds a strict IPv4 regex validation pattern before any shell command is constructed, ensuring only legitimate IP addresses can reach the dangerous sink. This kind of targeted input allowlisting is the gold