News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Davey Shafik's Blog:
The Blowfish Debacle
February 13, 2012 @ 10:02:49

Davey Shafik has a recent post to his blog about what he calls "The Blowfish Debacle" - the issues that came up with the PHP 5.3.7 release to upgrade the crypt_blowfish version that resulted in a larger error being introduced.

This was a great security fix, solving an issue with insecure passwords due to incorrect behavior. HOWEVER, what wasn't made clear, is that this change was actually a backwards compatibility break. If you upgraded to 5.3.7+ data hashed pre-5.3.7 would no longer match data hashed post-5.3.7; this means if you use it for passwords, it will no longer match. So what's the deal here?

He talks about the differences in the two methods of encryption, the newer being the "more correct" way of doing things. If you need the backwards compatibility because of previously hashed values, you can use the "$2x$" prefix instead of the usual "$2a$". He includes a snippet of code that can be used to upgrade all of your previously hashed blowfish passwords up to the new format.

0 comments voice your opinion now!
blowfish upgrade issue backwardscompatibility security fix


blog comments powered by Disqus

Similar Posts

PHP-Coding-Practices.com: Introduction To Security Vulnerabilities In PHP

Robert Peake\'s Blog: Zen-Cart <= 1.2.6d Security Fix

PHP.net: PHP 5.5.11 is released

Chris Shiflett's Blog: CakePHP Visits New York

PHP-Security.net: New PHP-CGI Exploit (CVE-2012-1823)


Community Events

Don't see your event here?
Let us know!


release version library threedevsandamaybe symfony security api framework community voicesoftheelephpant language opinion laravel introduction extension interview podcast laravel5 series unittest

All content copyright, 2015 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework