Simon Willison’s Weblog

Items tagged security, php

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In what circumstances should one use “magic quotes” in PHP?

Absolutely never. Magic quotes was a badly designed feature, and PHP has been trying to escape its legacy for years. If you are constructing SQL strings using string concatenation you’re asking for trouble—use prepared statements or a library that interpolates and correctly escapes variables for you.

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csrf_protect.php. A PHP class for applying CSRF protection to existing PHP applications, using output buffering to rewrite any POST forms on a page. Heavily inspired by Django’s CSRF middleware. Tell me if you spot any bugs! # 24th September 2008, 2:52 pm

The backdooring of SquirrelMail. A SquirrelMail developer’s account was compromised and used to insert a backdoor: the other developers initially missed the hole because it used $_SERVER[’HTTP_BASE_PATH’], which can be set with a Base-Path: HTTP header. # 28th December 2007, 11:40 pm

Unsettling. Sounds like there might be a massive scripted hack going on against out of date WordPress installs on Dreamhost. Check your site. See also discussion in the comments attached to this post. # 5th June 2007, 9:16 pm

PHP 4 phpinfo() XSS Vulnerability. Another reason not to run an open phpinfo() page on your server. # 4th March 2007, 9:24 pm

Hashing client-side data

Via Scott, a clever PHP technique for ensuring data sent to the browser as a cookie or hidden form variable isn’t tampered with by the user:

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