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Code Yellow Blog:
What Your Framework Never Told You About SQL Injection Protection
May 23, 2014 @ 13:51:20

The Code Yellow site has recently posted an article pointing out an issue that's all too common in PHP frameworks, more specifically those that bundle some kind of ORM into their functionality. They wonder if your framework is telling you everything about what they're doing to prevent SQL injection.

We've discovered that SQL injection is to this day not a fully solved problem, even in most popular frameworks. In this post, we'll explain how these frameworks fail at escaping parts of a query, culminating in the discovery of a critical vulnerability in the popular Laravel framework which affects a large percentage of applications.

He starts with an illustration using the FuelPHP framework and the protection it offers from garden variety SQL injection attempts. Unfortunately, things start to break down when it gets much past this typical case. They found this same issue to be a wide-spread problem in many PHP frameworks and tools including the Laravel, CodeIgniter and CakePHP frameworks, each with their own ORMs. He also talks about issues with blacklisting and whitelisting and how, sadly, most of the frameworks just don't support it for model data filtering. There's a mention of some of the work they've done to help try and fix the issue (including patches and contacting authors) and some recommendations of how to correctly quote identifiers in SQL statements.

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sqlinjection framework whitelist blacklist identifiers escape prepared statements

Link: http://www.codeyellow.nl/identifier-sqli.html

Mike Lively's Blog:
Improved PHPUnit Filters
February 03, 2009 @ 09:32:26

In a recent post to his blog Mike Lively looks at some improvements that he's worked up for the popular PHP unit testing software - PHPUnit - in regards to its filters.

I have finally gotten some time to do some long awaited work on PHPUnit. The first on my agenda was a small improvement to filtering. This was related to ticket #526. Essentially I added the ability to do both white list and black list filtering.

Besides the Include methods you can add to the data set's filtering, you can also add in Exclude filters to remove the data you don't want in the set. They can also be combined to customize your data set to your heart's content.

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input filter phpunit include exclude whitelist blacklist


Zend Developer Zone:
Security Tips #17 & #18 (When to Secure & File Uploads)
March 28, 2007 @ 17:19:49

The Zend Developer Zone continues their great series of security tips with two new posts - one talking about when to focus on security and the other about file uploads.

From the first, top 17:

Application security should not be a "when all else fails" situation. It's not something you can "put in later". As we've mentioned before, there is no single silver bullet to solve your application security issues. Security is something that should be rolling around in the back of your dead in the design phase, the coding phase, the testing phase, even after you've rolled your code into production.

And, from tip #18:

When you allow users to upload files, your system may be at risk. Always restrict the file types that you allow. Don't rely on a blacklist approach. [...] Be careful with file uploads and make sure you protect them with a whitelist policy instead. Make sure that the file that has been uploaded is of the type that you want to allow.
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securitytip consider security integrate file upload whitelist securitytip consider security integrate file upload whitelist


SitePoint PHP Blog:
Zend_Filter Reviewed, Blacklist / Whitelist Filters
March 28, 2006 @ 18:20:37

The Zend Framework has definitely made a huge splash in the PHP community, and everyone is picking their piece of it to cover. In this new post from the SitePoint PHP blog, Maarten Manders highlights the Zend_Filter module.

I like Zend Framework's Zend_Filter class. It's basically a set of methods for validating untrusted data. Although the two arguably most important features isEmail() and isUri() (the latter can be worked around with Zend_Uri) are still missing, the whole thing looks promising already.

He starts with a few of his thoughts on the package ("Clean up the code of isHostname", "International support for isPhone") and some code to show how it can be implemented - filtering for use in a regular expression, validation of a string by a character whitelist as well as blacklisting, and using the Zend_Filter module for a more flexible isName.

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zend framework zend_filter whitelist blacklist zend framework zend_filter whitelist blacklist



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