CVE Vulnerabilities

CVE-2020-15074

Authentication Bypass by Assumed-Immutable Data

Published: Jul 14, 2020 | Modified: Nov 21, 2024
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM

OpenVPN Access Server older than version 2.8.4 and version 2.9.5 generates new user authentication tokens instead of reusing exiting tokens on reconnect making it possible to circumvent the initial token expiry timestamp.

Weakness

The authentication scheme or implementation uses key data elements that are assumed to be immutable, but can be controlled or modified by the attacker.

Affected Software

Name Vendor Start Version End Version
Openvpn_access_server Openvpn * 2.8.4 (excluding)
Openvpn_access_server Openvpn 2.9.0 (including) 2.9.6 (excluding)
Openvpn Ubuntu eoan *
Openvpn Ubuntu trusty *

Potential Mitigations

References