title: Duo Network Gateway (DNG) Information Disclosure Vulnerability
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.
problem types: CWE-256 Unprotected Storage of Credentials
affected:
{
product: Duo Network Gateway (DNG)
vendor: Cisco
versions:
lessThan: 1.5.8, status: affected, version: unspecified, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: LOCAL
availabilityImpact: NONE
baseScore: 7.1
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
version: 3.1
]
solutions: 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.