PHP 5.3.7+ issue is_a function

Risk: High
Local: No
Remote: Yes

CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

PHP 5.3.7 changed the behavior of the is_a() function, used to check if an object is an instance of a class, to call the __autoload() function. This causes a remote code execute problem when coupled with a standard library like PEAR that internally uses is_a to check if a returned variable is an Error object or not. An unprotected __autoload() function that blindly includes based upon the variable it receives can be tricked into including a remote file by, for example, uploading a specially crafted file containing a link to a remote website. Full explanation + code example has been posted on our website at 5-3-7-5-3-8/ and has been e-mailed to security (at) php (dot) net [email concealed] -- Cipriano Groenendal


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