fix: MysqlSession should validate session ID format before checking DB#67
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fix: MysqlSession should validate session ID format before checking DB#67
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Credential-stuffing and malware bots will commonly attempt requests with manufactured session cookies e.g. to search for SQL, path or URL injection vulnerabilities. Currently, the MysqlSession driver checks all provided session IDs against the database to validate them. This is *NOT* a security issue, since we are using PDO's parameters to properly escape the provided values. However, it does cause an exception (and therefore an error report) because the `GET_LOCK` query uses the user-provided session ID as part of the lock name. If the lock name contains characters that are not valid in a lock, MySQL will give a syntax error, which in turn causes a PDOException. Instead, skip the database lookup and return false immediately (as for any other invalid session ID) if the ID does not match the expected length and character set.
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craig410
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Sep 17, 2025
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Credential-stuffing and malware bots will commonly attempt requests with manufactured session cookies e.g. to search for SQL, path or URL injection vulnerabilities.
Currently, the MysqlSession driver checks all provided session IDs against the database to validate them. This is NOT a security issue, since we are using PDO's parameters to properly escape the provided values.
However, it does cause an exception (and therefore an error report) because the
GET_LOCKquery uses the user-provided session ID as part of the lock name. If the lock name contains characters that are not valid in a lock, MySQL will give a syntax error, which in turn causes a PDOException.Instead, skip the database lookup and return false immediately (as for any other invalid session ID) if the ID does not match the expected length and character set.