In PHP before 5.6.32, 7.x before 7.0.25, and 7.1.x before 7.1.11, an error in the date extension's timelib_meridian handling of 'front of' and 'back of' directives could be used by attackers able to supply date strings to leak information from the interpreter, related to ext/date/lib/parse_date.c out-of-bounds reads affecting the php_parse_date function. NOTE: this is a different issue than CVE-2017-11145.
https://www.debian.org/security/2018/dsa-4081
https://www.debian.org/security/2018/dsa-4080
https://usn.ubuntu.com/3566-1/
https://security.netapp.com/advisory/ntap-20181123-0001/
https://github.com/php/php-src/commit/5c0455bf2c8cd3c25401407f158e820aa3b239e1
https://github.com/derickr/timelib/commit/aa9156006e88565e1f1a5f7cc088b18322d57536