The is_a function in PHP 5.3.7 and 5.3.8 triggers a call to the
__autoload function, which makes it easier for remote attackers to
execute arbitrary code by providing a crafted URL and leveraging
potentially unsafe behavior in certain PEAR packages and custom
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
BUGTRAQ:20110923 Security issue is_a function in PHP 5.3.7+
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