CVE-2017-3854 : Exploit Details and Defense Strategies

A vulnerability in the mesh code of Cisco Wireless LAN Controller (WLC) software allows unauthorized attackers to impersonate a WLC in a meshed topology, potentially leading to traffic manipulation or system control.

Understanding CVE-2017-3854

What is CVE-2017-3854?

This vulnerability in Cisco Wireless LAN Controller (WLC) software arises from inadequate authentication of the parent access point in a mesh configuration, enabling attackers to impersonate a WLC within a meshed topology.

The Impact of CVE-2017-3854

The vulnerability could allow attackers to manipulate traffic passing through the affected access point or gain complete control over the targeted system. Various Cisco products running susceptible versions of the Wireless LAN Controller software in meshed mode are affected.

Technical Details of CVE-2017-3854

Vulnerability Description

Exploitable flaw in the mesh code of Cisco Wireless LAN Controller (WLC) software
Insufficient authentication of the parent access point in a mesh configuration
Attackers can force systems to connect to rogue access points under their control

Affected Systems and Versions

Cisco 8500 Series Wireless Controller
Cisco 5500 Series Wireless Controller
Cisco 2500 Series Wireless Controller
Cisco Flex 7500 Series Wireless Controller
Cisco Virtual Wireless Controller
Wireless Services Module 2 (WiSM2)

Exploitation Mechanism

Attacker disconnects the target system from the legitimate parent access point
Target system connects to a rogue access point controlled by the attacker
Successful exploitation grants the attacker traffic manipulation capabilities or complete control over the system

Mitigation and Prevention

Immediate Steps to Take

Upgrade to a patched release
Implement additional configuration steps

Long-Term Security Practices

Regularly update software and firmware
Conduct security audits and assessments

Patching and Updates

Apply patches provided by Cisco