CVE-2020-3483

Duo Network Gateway (DNG) Information Disclosure Vulnerability

Published Oct 14, 2020 CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Description
Duo has identified and fixed an issue with the Duo Network Gateway (DNG) product in which some customer-provided SSL certificates and private keys were not excluded from logging. This issue resulted in certificate and private key information being written out in plain-text to local files on the DNG host. Any private keys logged in this way could be viewed by those with access to the DNG host operating system without any need for reversing encrypted values or similar techniques. An attacker that gained access to the DNG logs and with the ability to intercept and manipulate network traffic between a user and the DNG, could decrypt and manipulate SSL/TLS connections to the DNG and to the protected applications behind it. Duo Network Gateway (DNG) versions 1.3.3 through 1.5.7 are affected.

Remediation

Vendor Solution

To prevent this issue, DNG administrators should upgrade to the latest version, 1.5.8, by following the upgrade instructions on the DNG page on Duo.com: https://duo.com/docs/dng#upgrading-duo-network-gateway Customers should search all possible locations where logs have been written to determine if certificate and/or key information has been stored in logs. Note that DNG logs are overwritten each time the DNG is restarted, potentially overwriting any logs containing this sensitive information unless they had been previously exported from the Docker container.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2020-24754 Duo has identified and fixed an issue with the Duo Network Gateway (DNG) product in which some customer-provided SSL certificates and private keys were not excluded from logging. This issue resulted in certificate and private key information being written out in plain-text to local files on the DNG host. Any private keys logged in this way could be viewed by those with access to the DNG host operating system without any need for reversing encrypted values or similar techniques. An attacker that gained access to the DNG logs and with the ability to intercept and manipulate network traffic between a user and the DNG, could decrypt and manipulate SSL/TLS connections to the DNG and to the protected applications behind it. Duo Network Gateway (DNG) versions 1.3.3 through 1.5.7 are affected.
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisco
Published
Updated
Nov 13, 2024, 5:51 PM
Reserved
Dec 12, 2019, 12:00 AM
Status
Modified
Published
Oct 14, 2020, 7:15 PM
Modified
Jun 17, 2026, 3:18 AM