In PHP before 5.6.31, 7.x before 7.0.21, and 7.1.x before 7.1.7, a stack-based buffer overflow in the zend_ini_do_op() function in Zend/zend_ini_parser.c could cause a denial of service or potentially allow executing code. NOTE: this is only relevant for PHP applications that accept untrusted input (instead of the system's php.ini file) for the parse_ini_string or parse_ini_file function, e.g., a web application for syntax validation of php.ini directives.
http://git.php.net/?p=php-src.git;a=commit;h=05255749139b3686c8a6a58ee01131ac0047465e
http://git.php.net/?p=php-src.git;a=commit;h=5f8380d33e648964d2d5140f329cf2d4c443033c
http://www.securityfocus.com/bid/99489
https://access.redhat.com/errata/RHSA-2018:1296
https://bugs.php.net/bug.php?id=74603
https://security.gentoo.org/glsa/201709-21
https://security.netapp.com/advisory/ntap-20180112-0001/
Source: MITRE
Published: 2017-07-25
Updated: 2018-05-04
Type: CWE-119
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH