CVE-2017-11628 : Security Advisory and Response

PHP versions 5.6.31, 7.x before 7.0.21, and 7.1.x before 7.1.7 were affected by a stack-based buffer overflow vulnerability in the zend_ini_do_op() function. This could lead to denial of service or code execution in PHP applications that accept untrusted input for certain functions.

Understanding CVE-2017-11628

This CVE describes a critical vulnerability in PHP versions prior to 5.6.31, 7.0.21, and 7.1.7 that could be exploited to cause a denial of service or execute arbitrary code.

What is CVE-2017-11628?

A stack-based buffer overflow in the zend_ini_do_op() function in PHP
Vulnerability could allow attackers to disrupt services or run malicious code
Limited to PHP applications accepting untrusted input for specific functions

The Impact of CVE-2017-11628

The vulnerability had the potential to:

Cause denial of service attacks
Enable execution of arbitrary code within affected PHP applications

Technical Details of CVE-2017-11628

PHP versions before 5.6.31, 7.0.21, and 7.1.7 were susceptible to a critical buffer overflow issue.

Vulnerability Description

Stack-based buffer overflow in zend_ini_do_op() function
Located in the file Zend/zend_ini_parser.c

Affected Systems and Versions

PHP versions 5.6.31, 7.x before 7.0.21, and 7.1.x before 7.1.7

Exploitation Mechanism

Exploitable in PHP applications that accept untrusted input for parse_ini_string or parse_ini_file functions
Common in web-based mechanisms for php.ini directive syntax validation

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are crucial to mitigate the risks associated with CVE-2017-11628.

Immediate Steps to Take

Update PHP to versions 5.6.31, 7.0.21, or 7.1.7 or later
Avoid accepting untrusted input for parse_ini_string or parse_ini_file functions

Long-Term Security Practices

Regularly monitor PHP security advisories
Implement input validation mechanisms in PHP applications

Patching and Updates

Apply patches provided by PHP to address the buffer overflow vulnerability