CVE-2018-20423 : Security Advisory and Response

Discuz! DiscuzX 3.4 allows remote attackers to bypass a 'disabled registration' setting when the WeChat login feature is enabled.

Understanding CVE-2018-20423

When the WeChat login feature is enabled in Discuz! DiscuzX 3.4, attackers can circumvent the 'disabled registration' setting.

What is CVE-2018-20423?

This CVE describes a vulnerability in Discuz! DiscuzX 3.4 that enables remote attackers to bypass the 'disabled registration' setting by manipulating the plugin.php ac=wxregister query string.

The Impact of CVE-2018-20423

The vulnerability allows unauthorized users to register on the platform, potentially leading to unauthorized access and misuse of the system.

Technical Details of CVE-2018-20423

Discuz! DiscuzX 3.4 vulnerability details.

Vulnerability Description

When WeChat login is enabled, attackers can include a non-existent wxopenid value in the plugin.php ac=wxregister query string to bypass the 'disabled registration' setting.

Affected Systems and Versions

Product: Discuz! DiscuzX 3.4
Vendor: N/A
Version: N/A

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating the wxopenid value in the plugin.php ac=wxregister query string.

Mitigation and Prevention

Protect your system from CVE-2018-20423.

Immediate Steps to Take

Disable the WeChat login feature if not essential.
Regularly monitor user registrations for any suspicious activity.
Implement strong authentication mechanisms.

Long-Term Security Practices

Keep the Discuz! DiscuzX platform updated with the latest security patches.
Conduct regular security audits to identify and address vulnerabilities.

Patching and Updates

Check for security updates from the vendor and apply them promptly to mitigate the vulnerability.