The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: libapache2-mod-php7.0 7.0.33-0ubuntu0.16.04.12 php7.0-cgi 7.0.33-0ubuntu0.16.04.12 php7.0-cli 7.0.33-0ubuntu0.16.04.12 php7.0-fpm 7.0.33-0ubuntu0.16.04.12 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-4279-2
https://ubuntu.com/security/notices/USN-4279-1
CVE-2015-9253
https://launchpad.net/ubuntu/+source/php7.0/7.0.33-0ubuntu0.16.04.12
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