Add vpatch-CVE-2025-48703 rule and test#40
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This rule detects exploitation attempts of the CWP (CentOS Web Panel) filemanager changePerm endpoint, which is vulnerable to command injection via the
t_totalparameter (CVE-2022-44877). The rule matches requests to URIs containing/filemanager&acc=changeperm(case-insensitive, URL-decoded) and checks if thet_totalargument contains a backtick (`), which is a strong indicator of command injection in this context. The use oflowercaseandurldecodeensures normalization and case-insensitive matching. The rule is tightly scoped to minimize false positives by only triggering on the specific vulnerable endpoint and parameter. Allvalue:fields are lowercase, andcontainsis used for matching as per guidelines.