News Feed
Sections




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

Stefan Esser's Blog:
Suhosin 0.9.20 and crypt() Thread Safety Vulnerability
May 22, 2007 @ 08:34:00

Stefan Esser points out the latest release of his PHP security enhancement patch, Suhosin 0.9.20, and some of the features it adds, a major one specifically.

The most important addition is that a mutex is placed around the call to the system's crypt() function to ensure thread safety. This mutex is necessary to close a bunch of possible attacks on the libc crypt() function on multi threaded systems.

He goes on to explain why it's so important - correcting a possible race condition between competing threads looking to use the crypt() function at the same time. They use the same shared memory space and, because of this, can return possible invalid data. The patch changes this behavior and replaces it with a blowfish implementation to make things more thread-safe.

1 comment voice your opinion now!
suhosin patch security crypt threadsafe vulnerability suhosin patch security crypt threadsafe vulnerability


blog comments powered by Disqus

Similar Posts

Stefan Esser's Blog: Suhosin Updates - Improved Randomness & LAZY Symbol Loading

William Durand: REST APIs with Symfony2: The Right Way

thePHP.cc: Do No Enter!

Chris Shiflett\'s Blog: 2005 Highlights

PHP.net: PHP 5.3.27 Released - PHP 5.3 Reaching End of Life


Community Events





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


security version opinion series voicesoftheelephpant podcast community conference composer list symfony language framework artisanfiles library laravel tool introduction release interview

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework