CVE-2020-5859 : Exploit Details and Defense Strategies

On BIG-IP 15.1.0.1, specially formatted HTTP/3 messages may cause TMM to produce a core file.

Understanding CVE-2020-5859

This CVE involves a vulnerability in BIG-IP 15.1.0.1 that can lead to a Denial of Service (DoS) condition.

What is CVE-2020-5859?

CVE-2020-5859 is a vulnerability that allows specially crafted HTTP/3 messages to trigger a core file generation by the Traffic Management Microkernel (TMM) on BIG-IP 15.1.0.1.

The Impact of CVE-2020-5859

The vulnerability can be exploited by an attacker to disrupt the availability of services, potentially leading to a DoS condition.

Technical Details of CVE-2020-5859

This section provides more technical insights into the vulnerability.

Vulnerability Description

Specially formatted HTTP/3 messages on BIG-IP 15.1.0.1 can cause TMM to generate a core file, potentially disrupting services.

Affected Systems and Versions

Product: BIG-IP
Version: 15.1.0.1

Exploitation Mechanism

Attackers can exploit this vulnerability by sending maliciously crafted HTTP/3 messages to the affected system, triggering the core file generation.

Mitigation and Prevention

Protecting systems from CVE-2020-5859 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly.
Implement network-level protections to filter out malicious traffic.
Monitor system logs for any unusual activity that may indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch all software and systems to mitigate known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

F5 has likely released patches or updates to address CVE-2020-5859. Ensure timely application of these fixes to safeguard systems.