Multiple vulnerabilities have been identified in PHP, which could be exploited by malicious users to bypass security restrictions and potentially compromise a vulnerable server.
The first issue is due to a design error within the "_zval_struct" structure where the reference counter is a 16-bit length value, which could be exploited by attackers to overflow the counter via a PHP script that creates a large number of references for a specific variable, and execute arbitrary commands on the underlying operating system bypassing "disable_functions", "open_basedir", and "safe_mode" restrictions. This issue could also potentially be exploited remotely via the "unserialize()" function [...]
Affected Products
PHP versions 4.x
PHP versions 5.x
Credits
Vulnerabilities reported by Stefan Esser
ChangeLog
2007-03-01 : Initial release
2007-03-23 : Updated Description
2007-03-30 : Updated Description
2007-04-07 : Updated Description
2007-05-04 : Updated Solution
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