CVE-2018-0090 : What You Need to Know

A vulnerability in the configuration of the access control list (ACL) for the management interface in Cisco NX-OS System Software could allow unauthorized remote attackers to bypass configured ACLs, leading to a denial of service (DoS) situation.

Understanding CVE-2018-0090

This CVE involves a vulnerability in Cisco NX-OS System Software that could be exploited by attackers to impact the CPU of the targeted device.

What is CVE-2018-0090?

The vulnerability allows attackers to bypass ACLs configured for the management interface, forwarding traffic to the CPU and causing high CPU usage, potentially resulting in a DoS situation.

The Impact of CVE-2018-0090

Unauthorized remote attackers can exploit the vulnerability to evade configured ACLs and impact the CPU of the targeted device, leading to a DoS scenario.

Technical Details of CVE-2018-0090

This section provides more technical insights into the vulnerability.

Vulnerability Description

An improper code fix in the 7.3.2 code train misclassifies traffic directed at the management interface, allowing attackers to bypass ACLs.

Affected Systems and Versions

Cisco products using Cisco NX-OS System Software, including various switches in standalone NX-OS mode, are affected.

Exploitation Mechanism

Attackers can send specially crafted traffic to the management interface to exploit the vulnerability.

Mitigation and Prevention

Steps to address and prevent exploitation of the vulnerability.

Immediate Steps to Take

Apply the necessary patches provided by Cisco to mitigate the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch Cisco NX-OS software to prevent vulnerabilities.
Implement network segmentation and access controls to limit exposure.

Patching and Updates

Stay informed about security advisories from Cisco and apply patches promptly to secure the network.