CVE-2020-3442 : Vulnerability Insights and Analysis

This CVE involves a vulnerability in the DuoConnect client that allows attackers to potentially gain network-level access to servers and ports protected by a Duo Network Gateway (DNG) instance.

Understanding CVE-2020-3442

This section provides insights into the nature and impact of the vulnerability.

What is CVE-2020-3442?

The DuoConnect client, used for SSH connections to DNG-protected hosts, is susceptible to exposing authentication tokens over insecure connections, potentially enabling unauthorized access to protected servers.

The Impact of CVE-2020-3442

The vulnerability poses a medium-severity risk, with a CVSS base score of 4.8. It allows attackers to intercept authentication tokens transmitted over insecure connections, compromising confidentiality.

Technical Details of CVE-2020-3442

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The issue arises from DuoConnect storing authentication tokens insecurely, potentially exposing them during SSH relay operations.

Affected Systems and Versions

Product: DUO Connect
Vendor: Cisco
Versions Affected: < 1.1.1 (unspecified/custom)

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Adjacent Network
Confidentiality Impact: High
User Interaction: Required
Privileges Required: None

Mitigation and Prevention

Learn how to address and prevent the CVE-2020-3442 vulnerability.

Immediate Steps to Take

Update DuoConnect to version 1.1.1 that rejects insecure relay configurations.
End-users prompted by DNG should update DuoConnect or download the latest version directly.

Long-Term Security Practices

Regularly update DuoConnect and follow DNG instructions for upgrades.
Ensure SSH configurations use HTTPS-based relays to prevent exposure.

Patching and Updates

Verify the authenticity of DuoConnect installer files.
Update SSH configurations to use HTTPS relays.