PHP versions earlier than 5.5.2 are affected by the following vulnerabilities :
An error exists related to the ‘Sessions’ subsystem that can allow an attacker to hijack the session of another user. (CVE-2011-4718 / Bug #60491)
An error exists related to certificate validation, the ‘subjectAltName’ field and certificates containing NULL bytes. This error can allow spoofing attacks. (CVE-2013-4248)
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