104 posts related to: Protect Against Malicious POST Requests

Apache Redirect Range of IP Addresses (IPv4 and IPv6)

There are numerous ways to redirect requests using Apache’s mod_rewrite and mod_alias. This concise, friendly tutorial explains different ways to redirect a range of IP addresses, either IPv4 or IPv6. Continue reading »

Disable Apache mod_rewrite Rules in any Subdirectory

Let’s say you have some .htaccess rewrite rules in place using Apache’s mod_rewrite. By default if the rewrite rules are located in the root directory, they will be applied to every subdirectory, as expected. But what if you need to disable the rewrite rules so that they do not affect some specific sub-directory or sub-folder? This super quick tutorial shows the easiest way to do it. Continue reading »

4 Ways to Make a WordPress Site Private Access Only

Have you ever wanted to make a WordPress site private? So that only specific users are allowed access? For example, for my found-images site eChunks.com, I decided to require user login in order to access any content. So now for that site, public access is not allowed, and any posts, images, and all other content is available only to logged-in users. This tutorial explains four ways to make a WordPress site private or members only, so that only authenticated/trusted users […] Continue reading »

How to Disable Chrome Scroll to Text Fragment

It is debatable whether or not Chrome’s new scrolltotextfragment feature is a significant security concern. When in doubt, play it safe. This quick post explains how to disable (or enable) Chrome’s scroll-to-text-fragment functionality. Continue reading »

How to Modify GET and POST Requests with WordPress

I’ve written before about protecting against malicious POST requests using Apache/.htaccess. In this tutorial, we’ll look at how to modify GET and POST requests using PHP and some core WordPress functionality (with no .htaccess required). Normally you would want to manipulate URI requests at the server level, but that’s not always possible (like on shared hosting). So in those cases where you want to modify GET, POST, or other types of requests on a WordPress site, check out the following […] Continue reading »

Stop WordPress from Changing .htaccess

[ Prevent WordPress Automatic .htaccess Modifications ]

In a recent tutorial, I explain how to Stop WordPress from modifying .htaccess. That post explains several ways to prevent WordPress from making changes to .htaccess. This post explains an even better way that is safe, effective, non-invasive, re-usable, and super simple. I’ve been using it on my own sites now for a few years and it works flawlessly. Continue reading »

How to Monitor the WordPress Login Page

There are all sorts of plugins that you can use to monitor and protect the WordPress Login Page. That’s not what this post is about. This post is aimed at developers and DIY site admins, who like to keep a close eye on site activity. Talking hands-on with code. How familiar are you with the traffic hitting your WP Login Page? Do you know the difference between a brute-force attack and legitimate login requests? The WP Login Page (wp-login.php) is […] Continue reading »

.htaccess Redirect Examples

Finally put together a giant list of .htaccess redirect examples. It’s meant as a quick copy-&-paste resource for those who may be looking for an assortment of redirect techniques. Here you will find redirects via mod_alias and mod_rewrite. Examples include redirecting to and from any directory, subdirectory, resource, URL, and much more. Most of these examples are taken from my previous article, Stupid htaccess Tricks; other examples are taken from previous .htaccess tutorials here at Perishable Press. Enjoy! :) Continue reading »

WordPress Error Fix: “Call to undefined function get_header()”

I’m seeing a big increase in bot attacks targeting theme files directly. First they get the URL to your theme directory. There are numerous ways for a bot to get this information. For example most themes include assets like CSS and JavaScript files, and the link includes the full URL. So then once they have the theme URL, bad bots will make direct requests for well-known theme template files, like index.php and header.php. Requesting template files directly may reveal possible […] Continue reading »

Ultimate Comment Blacklist for WordPress: How to Stop Spam Without Plugins

[ WordPress Ultimate Comment Blacklist ]

How do YOU stop comment spam? If you’re like a lot of WordPress users, you just grab another plugin or two and call it good. I mean after all, plugins like Akismet work great at stopping spam. The only downside is that, well, you’re relying on another plugin. And that’s fine for folks who just wanna “get ’er done”, although each active plugin requires additional maintenance and server resources. Continue reading »

Automatic IP Blacklist

Recently a reader going by the name of Rock Star sent me a cool little PHP script that automatically updates your site’s .htaccess with a current list of bad IP addresses. This is useful because it gives you better “real time” protection against attacks and malicious requests. This tutorial shares the code and explains how to implement in two easy steps. Continue reading »

Difference between mod_alias and mod_rewrite

Most of the redirect techniques provided in my stupid .htaccess tricks article all use Apache’s alias module, mod_alias. You can also use mod_rewrite to redirect URLs. The main difference is that, with mod_alias, the server is responding to the client request with a redirect, so the client immediately is sent to the new location. Conversely, with mod_rewrite, the server simply returns the new content, so the client is not actually redirected anywhere. This makes mod_rewrite more advantageous because it happens […] Continue reading »

404 Fix: Block Nuisance Requests for Non-Existent Files

[ Han Solo shutting up C-3PO in Empire Strikes Back ]

As I’ve written before, blocking nuisance requests can help save you money by cutting down on wasted server resources, memory, and so forth. It also saves you time, as your server access and error logs won’t be full of nuisance request spam. So you will have more resources and time for things that matter, like running your business, helping customers, improving code, etc. So to continue the proud tradition of blocking malicious traffic, this post builds upon previous blocking techniques […] Continue reading »

Examples of Nested Encoding

Typically malicious scans use some sort of encoding to obscure their payloads. For example, instead of injecting a literal script, the attacker will run it through a PHP encoding function such as base64_encode(), utf8_encode(), or urlencode(). So if and when you need to decode some discovered payload, you can use whichever decoding function will do the job. For example, base64_decode(), utf8_decode(), or urldecode(). Sounds straightforward, but let’s dig a little deeper.. Continue reading »

WordPress .htaccess file

The WordPress core uses .htaccess for two things: Permalinks and Multisite. This means that .htaccess is only required if you have enabled either of these features. Otherwise, .htaccess is entirely optional for default WordPress installations. Beyond the WP core, many plugins also use the .htaccess file for custom directives involving rewrites, redirects, custom headers, file compression, and much more. In many cases, such plugins add their .htaccess rules to your .htaccess file automatically, behind the scenes. Continue reading »

.htaccess Cleanup

Once again I am cleaning up my sites’ .htaccess files. I do this from time to time to remove old redirects, refresh blacklists, and update security and SEO-related directives. It’s tedious work, but the performance and security benefits make it all worthwhile. This post shares some of the techniques that were added, removed, or replaced from .htaccess, and explains the reasoning behind each decision. I do this for the sake of reference, and hopefully it will give you some ideas […] Continue reading »

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