FrankenPHP affected by Path Confusion via Unicode casing in CGI path splitting allows execution of arbitrary files

FrankenPHP is a modern application server for PHP. Prior to 1.11.2, FrankenPHP’s CGI path splitting logic improperly handles Unicode characters during case conversion. The logic computes the split index (for finding .php) on a lowercased copy of the request path but applies that byte index to the original path. Because strings.ToLower() in Go can increase the byte length of certain UTF-8 characters (e.g., Ⱥ expands when lowercased), the computed index may not align with the correct position in the original string. This results in an incorrect SCRIPT_NAME and SCRIPT_FILENAME, potentially causing FrankenPHP to execute a file other than the one intended by the URI. This vulnerability is fixed in 1.11.2.

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不正确的行为次序：规范化之前验证

FrankenPHP 安全漏洞

FrankenPHP是phpnet开源的一个PHP应用服务器。 FrankenPHP 1.11.2之前版本存在安全漏洞，该漏洞源于CGI路径分割逻辑在处理Unicode字符时大小写转换不当，可能导致执行非预期URI指定的文件。

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