CVE-2019-12743 : Security Advisory and Response

HumHub Social Network Kit Enterprise v1.3.13 has a vulnerability that allows remote attackers to discover user accounts on any Social Network Kits, including self-hosted ones, by brute-forcing usernames.

Understanding CVE-2019-12743

This CVE identifies a vulnerability in HumHub Social Network Kit Enterprise v1.3.13 that can lead to the exposure of user accounts.

What is CVE-2019-12743?

The version 1.3.13 of the HumHub Social Network Kit Enterprise has a vulnerability that allows remote attackers to discover user accounts on any Social Network Kits, including self-hosted ones. This can be achieved by brute-forcing the username after the /u/ initial URI substring. This vulnerability is also known as Response Discrepancy Information Exposure.

The Impact of CVE-2019-12743

Remote attackers can access user accounts on Social Network Kits, compromising user privacy and security.

Technical Details of CVE-2019-12743

HumHub Social Network Kit Enterprise v1.3.13 is susceptible to a specific vulnerability.

Vulnerability Description

Attackers can exploit the vulnerability to reveal user accounts on various Social Network Kits.

Affected Systems and Versions

Product: HumHub Social Network Kit Enterprise
Version: 1.3.13

Exploitation Mechanism

Attackers can brute-force usernames after the /u/ initial URI substring to access user accounts.

Mitigation and Prevention

Steps to address and prevent the CVE-2019-12743 vulnerability.

Immediate Steps to Take

Update HumHub Social Network Kit Enterprise to a patched version.
Monitor user accounts for any suspicious activity.

Long-Term Security Practices

Implement strong password policies.
Regularly audit and review user access controls.

Patching and Updates

Apply security patches and updates promptly to prevent exploitation of vulnerabilities.