CVE-2017-5493 : Security Advisory and Response

WordPress before version 4.7.1 is vulnerable due to a flaw in the Multisite WordPress API. Attackers can exploit this vulnerability to bypass access restrictions by manipulating site or user signups.

Understanding CVE-2017-5493

The vulnerability in the Multisite WordPress API allows remote attackers to create malicious site or user signups, circumventing intended access controls.

What is CVE-2017-5493?

The vulnerability in the wp-includes/ms-functions.php file of WordPress before version 4.7.1 arises from the incorrect selection of random numbers for keys in the Multisite WordPress API.

The Impact of CVE-2017-5493

This vulnerability enables remote attackers to exploit the system by creating malicious site or user signups, thereby bypassing the intended access restrictions.

Technical Details of CVE-2017-5493

The technical aspects of the CVE-2017-5493 vulnerability are as follows:

Vulnerability Description

The flaw in wp-includes/ms-functions.php in the Multisite WordPress API allows attackers to bypass access restrictions.

Affected Systems and Versions

Product: WordPress
Vendor: WordPress
Versions affected: Before 4.7.1

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating site or user signups, gaining unauthorized access.

Mitigation and Prevention

Protect your system from CVE-2017-5493 with these measures:

Immediate Steps to Take

Update WordPress to version 4.7.1 or later to patch the vulnerability.
Monitor site and user signups for any suspicious activity.

Long-Term Security Practices

Regularly update WordPress and plugins to prevent known vulnerabilities.
Implement strong access controls and user authentication mechanisms.
Conduct security audits and penetration testing to identify and address potential weaknesses.
Educate users on safe signup practices and security awareness.

Patching and Updates

Apply security patches promptly to ensure protection against known vulnerabilities.