CVE-2019-6612 : Vulnerability Insights and Analysis

A vulnerability in F5 BIG-IP versions 11.5.2-14.1.0.1 could lead to a Denial of Service (DoS) attack.

Understanding CVE-2019-6612

This CVE involves a potential DoS risk in F5 BIG-IP products due to terminated DNS query TCP connections.

What is CVE-2019-6612?

The vulnerability may cause the Traffic Management Microkernel (TMM) to restart if DNS query TCP connections are terminated before receiving a response from a DNS cache on affected F5 BIG-IP versions.

The Impact of CVE-2019-6612

The vulnerability could be exploited by an attacker to disrupt services, leading to a DoS condition on the affected systems.

Technical Details of CVE-2019-6612

This section provides more in-depth technical details about the CVE.

Vulnerability Description

The issue arises when DNS query TCP connections are abruptly terminated before receiving a response from a DNS cache, potentially triggering a TMM restart.

Affected Systems and Versions

F5 BIG-IP versions 14.0.0-14.1.0.1
F5 BIG-IP versions 13.0.0-13.1.1.4
F5 BIG-IP versions 12.1.0-12.1.4
F5 BIG-IP versions 11.6.1-11.6.3.4
F5 BIG-IP versions 11.5.2-11.5.8

Exploitation Mechanism

The vulnerability can be exploited by terminating DNS query TCP connections prematurely, causing the TMM to restart and potentially leading to a DoS attack.

Mitigation and Prevention

Protecting systems from CVE-2019-6612 requires immediate actions and long-term security measures.

Immediate Steps to Take

Monitor network traffic for any suspicious activities related to DNS query TCP connections.
Apply vendor-supplied patches or updates to mitigate the vulnerability.

Long-Term Security Practices

Regularly update and patch F5 BIG-IP devices to address known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

F5 has released patches to address the vulnerability. Ensure timely application of these patches to secure the affected systems.