In communications and information processing, code is a system of rules to convert information—such as a letter, word, sound, image, or gesture—into another form, sometimes shortened or secret, for communication through a communication channel or storage in a storage medium.
Linux Server Security &Hardening linux server
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What is Linux? Linux in its most basic form is a kernel; a low-level software interface between a computer's hardware and higher-level software. The Linux kernel is not an operating system per se, but serves as a fundamental building block for hundreds of different Linux distributions (short for 'distributions'): operating systems built on top of Linux. There is no definitive Linux distribution, so keep that in mind throughout this guide. Each distribution has its own quirks, and the open nature of many means that new versions can be quickly created, old security issues fixed, and new ones created. Research the specific distribution and version you're interested in hardening! Basic Linux Hardening Checklist This section uses the Linux command line, but you do not need to be familiar with it to complete this section. A few tips: Take the time to research each change before implementing it! Understand the purpose of each change and what impact it will have. Note that all the...
PHP Dangerous Functions List
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Command Execution exec - Returns last line of commands output passthru - Passes commands output directly to the browser system - Passes commands output directly to the browser and returns last line shell_exec - Returns commands output \`\` (backticks) - Same as shell_exec() popen - Opens read or write pipe to process of a command proc_open - Similar to popen() but greater degree of control pcntl_exec - Executes a program PHP Code Execution assert() - identical to eval() preg_replace('/.*/e',...) - /e does an eval() on the match create_function() include() include_once() require() require_once() $_GET['func_name']($_GET['argument']); $func = new ReflectionFunction($_GET['func_name']); $func->invoke(); or $func->invokeArgs(array()); List of functions which accept callbacks Function => Position of callback arguments 'ob_start' => 0, 'array_diff_uassoc' => -1, 'array_diff_ukey'...

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