CVE-2017-6655 : What You Need to Know

A vulnerability in the Fibre Channel over Ethernet (FCoE) protocol implementation in Cisco NX-OS Software could allow an unauthenticated attacker to trigger a denial of service (DoS) situation by causing a sudden reload of an FCoE-related process. This CVE affects various Cisco devices running FCoE configurations.

Understanding CVE-2017-6655

This CVE involves a flaw in the Fibre Channel over Ethernet (FCoE) protocol implementation in Cisco NX-OS Software, potentially leading to a DoS scenario.

What is CVE-2017-6655?

The vulnerability in Cisco NX-OS Software's FCoE protocol could be exploited by an adjacent attacker without authentication to induce a DoS condition by causing an unexpected reload of an FCoE-related process.

The Impact of CVE-2017-6655

The vulnerability could lead to a denial of service (DoS) situation on affected Cisco devices running FCoE configurations.

Technical Details of CVE-2017-6655

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw in the Fibre Channel over Ethernet (FCoE) protocol implementation in Cisco NX-OS Software allows an unauthenticated attacker to trigger a DoS situation by causing an FCoE-related process to reload unexpectedly.

Affected Systems and Versions

Cisco devices running FCoE configurations, including Multilayer Director Switches, Nexus 7000 Series Switches, and Nexus 7700 Series Switches, are impacted.
Affected releases include 8.3(0)CV(0.833).

Exploitation Mechanism

An adjacent attacker can exploit the vulnerability without authentication, leading to a sudden reload of an FCoE-related process and triggering a DoS condition.

Mitigation and Prevention

Steps to address and prevent the CVE-2017-6655 vulnerability.

Immediate Steps to Take

Apply the fixes provided in the following releases: 8.3(0)ISH(0.62), 8.3(0)CV(0.944), 8.1(1), 8.1(0.8)S0, and 7.3(2)D1(0.47).
Monitor Cisco advisories for any further updates or patches.

Long-Term Security Practices

Regularly update and patch Cisco NX-OS Software to mitigate potential vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Ensure timely installation of patches and updates provided by Cisco to address the CVE-2017-6655 vulnerability.