KLA10944
Denial of service and arbitrary code execution vulnerabilities in PHP

An improper implementation of the SplObjectStorage unserialize in ext/spl/spl_observer.c was found in PHP before 7.0.12. By exploiting this vulnerability malicious users can execute arbitrary code or cause a denial of service. This vulnerability can be exploited remotely via a specially designed serialized data.

Technical details

Vulnerability occurs because an implementation does not verify whether a key is an object or not.

PHP 7.x before 7.0.12

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