CVE-2020-5923 : Security Advisory and Response

In BIG-IP versions 15.0.0-15.1.0.4, 14.1.0-14.1.2.6, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1 and BIG-IQ versions 5.4.0-7.0.0, a vulnerability allows for Self-IP port-lockdown bypass via IPv6 link-local addresses.

Understanding CVE-2020-5923

This CVE identifies a security issue in F5's BIG-IP and BIG-IQ products.

What is CVE-2020-5923?

The vulnerability in the affected versions enables unauthorized access through a specific bypass method.

The Impact of CVE-2020-5923

The vulnerability could potentially lead to unauthorized access to systems and sensitive data, posing a security risk to organizations using the impacted versions.

Technical Details of CVE-2020-5923

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability allows attackers to bypass Self-IP port lockdown using IPv6 link-local addresses, potentially leading to unauthorized access.

Affected Systems and Versions

Products: BIG-IP, BIG-IQ
Versions: BIG-IP 15.0.0-15.1.0.4, 14.1.0-14.1.2.6, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, 11.6.1-11.6.5.1, BIG-IQ 5.4.0-7.0.0

Exploitation Mechanism

The vulnerability can be exploited by utilizing IPv6 link-local addresses to bypass Self-IP port lockdown, potentially gaining unauthorized access.

Mitigation and Prevention

Protecting systems from this vulnerability is crucial for maintaining security.

Immediate Steps to Take

Apply patches provided by F5 to address the vulnerability.
Implement network segmentation to limit exposure.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch systems to prevent known vulnerabilities.
Conduct security assessments and audits to identify and mitigate risks.

Patching and Updates

Stay informed about security updates from F5 and apply patches promptly to secure systems.