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

Zend Developer Zone: The ZendCon Sessions Episode 27: Security Centered Design

PHP.net: PHP 5.4.5 and PHP 5.3.15 released!

CodeIgniter Blog: CodeIgniter 1.6.3 Maintenance and Security Release

Community News: MySQL patch mysql_real_escape_string()

PHP Security Consortium: SecurityFocus Summaries Posted


Community Events





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


tool interview language release composer version introduction opinion podcast install series library package security symfony laravel voicesoftheelephpant community application framework

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