CVE-2017-6159 : Exploit Details and Defense Strategies

F5 Networks, Inc. BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, DNS, GTM, Link Controller, PEM, and Websafe versions 12.0.0 to 12.1.2 and 11.6.0 to 11.6.1 are susceptible to a denial of service vulnerability when the MPTCP option is activated on a virtual server.

Understanding CVE-2017-6159

This CVE involves a denial of service risk affecting specific versions of F5 Networks' software.

What is CVE-2017-6159?

The vulnerability targets the data plane when utilizing the MPTCP option of a TCP profile, potentially leading to service disruption by causing TMM to restart.

The Impact of CVE-2017-6159

The vulnerability could result in a temporary failure to process traffic, affecting the availability of services. However, there is no risk to the control plane.

Technical Details of CVE-2017-6159

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability in F5 BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, DNS, GTM, Link Controller, PEM, and Websafe versions 12.0.0 to 12.1.2 and 11.6.0 to 11.6.1 allows for a denial of service attack when the MPTCP option is enabled on a virtual server.

Affected Systems and Versions

Products: BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, DNS, GTM, Link Controller, PEM, Websafe
Versions: 12.0.0 - 12.1.2, 11.6.0, 11.6.1

Exploitation Mechanism

The vulnerability is exploited by activating the MPTCP option on a virtual server, targeting the data plane and potentially causing TMM to restart, disrupting service.

Mitigation and Prevention

Protecting systems from CVE-2017-6159 is crucial to maintaining security.

Immediate Steps to Take

Disable the MPTCP option on virtual servers to prevent exploitation.
Regularly monitor for any unusual TMM restarts that could indicate an attack.

Long-Term Security Practices

Stay informed about security updates and patches from F5 Networks.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Apply patches provided by F5 Networks promptly to address the vulnerability and enhance system security.