CVE-2020-3429 : Exploit Details and Defense Strategies

A vulnerability in the WPA2 and WPA3 security implementation of Cisco IOS XE Wireless Controller Software for the Cisco Catalyst 9000 Family could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.

Understanding CVE-2020-3429

This CVE involves a security vulnerability in Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family, potentially leading to a DoS attack.

What is CVE-2020-3429?

The vulnerability arises from incorrect packet processing during the WPA2 and WPA3 authentication handshake when configured for dot1x or pre-shared key (PSK) authentication key management (AKM) with 802.11r BSS Fast Transition (FT) enabled. An attacker can exploit this by sending a crafted authentication packet to the device, causing it to reload and resulting in a DoS condition.

The Impact of CVE-2020-3429

CVSS Base Score: 7.4 (High Severity)
Attack Vector: Adjacent Network
Availability Impact: High
The vulnerability does not impact confidentiality or integrity but can lead to a significant availability impact.

Technical Details of CVE-2020-3429

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows an unauthenticated attacker to trigger a DoS condition by exploiting the WPA2 and WPA3 security implementation in Cisco IOS XE Wireless Controller Software.

Affected Systems and Versions

Affected Product: Cisco IOS XE Software
Vendor: Cisco
Affected Version: Not Applicable

Exploitation Mechanism

The attacker can exploit the vulnerability by sending a specially crafted authentication packet to the affected device, causing it to reload and leading to a DoS condition.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Apply the latest security updates provided by Cisco.
Disable 802.11r BSS Fast Transition (FT) if not required.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all network devices.
Implement strong network segmentation and access controls.
Conduct regular security audits and assessments.

Patching and Updates

Cisco has released patches to address this vulnerability. Ensure timely application of these patches to mitigate the risk of exploitation.