CVE-2017-3873 : Security Advisory and Response

A security weakness has been identified in the Plug-and-Play (PnP) system of the Cisco Aironet 1800, 2800, and 3800 Series Access Points, potentially allowing unauthorized attackers to run arbitrary code with root privileges.

Understanding CVE-2017-3873

What is CVE-2017-3873?

This CVE refers to a vulnerability in the PnP system of Cisco Aironet Access Points, specifically affecting devices running a Lightweight AP or Mobility Express image.

The Impact of CVE-2017-3873

If exploited, attackers in close proximity to the affected device can execute arbitrary code with root privileges due to inadequate validation of PnP server responses.

Technical Details of CVE-2017-3873

Vulnerability Description

The vulnerability arises from insufficient validation of PnP server responses in Cisco Aironet Access Points.

Affected Systems and Versions

Cisco Aironet 1800, 2800, and 3800 Series Access Points running software version 8.3.102.0.

Exploitation Mechanism

Attackers need to respond to PnP configuration requests from the compromised device with malicious PnP responses to exploit the vulnerability.

Mitigation and Prevention

Immediate Steps to Take

Disable the PnP feature on affected devices if not required.
Implement network segmentation to limit access to vulnerable devices.

Long-Term Security Practices

Regularly monitor and update firmware on Cisco Aironet Access Points.
Conduct security assessments to identify and address vulnerabilities.

Patching and Updates

Apply the necessary patches provided by Cisco to address the vulnerability.