CVE-2020-27714 : Exploit Details and Defense Strategies

A vulnerability in BIG-IP AFM versions 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.5 could lead to a Denial of Service (DoS) attack.

Understanding CVE-2020-27714

This CVE identifies a specific issue in the BIG-IP AFM software that could potentially impact system availability.

What is CVE-2020-27714?

The vulnerability occurs when a Protocol Inspection Profile is linked to a FastL4 virtual server with the protocol field set to Other or All Protocols, causing potential TMM restarts due to non-TCP traffic processing.

The Impact of CVE-2020-27714

The vulnerability could be exploited by an attacker to trigger a DoS condition, disrupting services and affecting system performance.

Technical Details of CVE-2020-27714

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The issue arises in BIG-IP AFM versions due to improper handling of non-TCP traffic by Protocol Inspection Profiles, leading to TMM restarts.

Affected Systems and Versions

BIG-IP AFM versions 15.1.0-15.1.0.5
BIG-IP AFM versions 14.1.0-14.1.3
BIG-IP AFM versions 13.1.0-13.1.3.5

Exploitation Mechanism

Attackers can exploit this vulnerability by sending non-TCP traffic through a FastL4 virtual server with specific Protocol Inspection Profile configurations.

Mitigation and Prevention

Protecting systems from CVE-2020-27714 requires immediate actions and long-term security measures.

Immediate Steps to Take

Disable Protocol Inspection Profiles on affected virtual servers if not essential.
Monitor system logs for any signs of TMM restarts.

Long-Term Security Practices

Regularly update and patch BIG-IP AFM to the latest version.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Apply vendor-supplied patches and updates promptly to mitigate the vulnerability and enhance system security.