Common PHP security issues and how to deal with them

In today's increasingly prosperous commercial Internet, website security has always been a hot topic. Information leakage and property losses caused by security vulnerabilities are also undesirable. Currently, websites using PHP as the back-end language dominate. Today we will use PHP to talk about security precautions.

Common ways to invade the system: command injection, cross-site scripting, file inclusion, code injection, SQL injection, XPath injection, HTTP response splitting, file management, file upload, variable override, dynamic function

Session security: httponly settings, domain settings, path settings, cookie duration, secure settings, session fixed, CSRF

Encryption: passwords are stored in clear text, passwords are weakly encrypted, and passwords are stored where attackers can access them File

Authentication and authorization: user authentication, unauthenticated calls to functions or files, password hardcoding

Random functions: rand(), mt_srand and mt_rand()

Special characters and multi-byte encoding: Multi-byte encoding

PHP dangerous functions: buffer overflow, session_destroy() deletion file vulnerability, unset()-zend_hash_del_key_or_index vulnerability

Information leakage: phpinfo

PHP environment: open_basedir settings, allow_url_fopen settings, allow_url_include settings, safe_mode_exec_dir settings, magic_quote_apc settings, register_globals settings, safe_mode settings, session_usee_trans_sid settings, displiay_errors settings, expose_php settings

XSS injection point: HTML element , element attribute value, URL query, CSS attribute value, Javascript variable

Related reading;

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