CVE-2020-8953

published 2020-02-13

CVE-2020-8953: OpenVPN Access Server 2.8.x before 2.8.1 allows LDAP authentication bypass (except when a user is enrolled in two-factor authentication).

Priority P2 62 critical 9.8 CVSS 3.1

AV N AC L PR N UI N S U C H I H A H

OpenVPN Access Server 2.8.x before 2.8.1 allows LDAP authentication bypass (except when a user is enrolled in two-factor authentication).

Affected

1 ranges

Vendor	Product	Version range	Fixed in
openvpn	openvpn_access_server	>= 2.8.0 < 2.8.1	2.8.1

Detection & IOCs extracted from sources · hover to see the quote

• → Vulnerability affects OpenVPN Access Server versions 2.8.x before 2.8.1 — detection should focus on identifying deployments of this specific version range ↗
• → The authentication bypass is in the LDAP integration layer (management layer) of Access Server, not in the core OpenVPN community release — monitor LDAP authentication events on Access Server for anomalous successful logins without valid credentials ↗
• → Users enrolled in two-factor authentication are NOT affected by this bypass — investigate successful LDAP authentications for accounts that do NOT have 2FA enrolled, as these are the exploitable accounts ↗

• · This vulnerability is NOT applicable to community releases of OpenVPN (e.g., as shipped in Fedora or Red Hat products) — only the commercial OpenVPN Access Server product is affected ↗
• · Two-factor authentication enrollment on user accounts mitigates the LDAP bypass — ensure 2FA is enforced for all LDAP-authenticated users on Access Server 2.8.x as a compensating control prior to patching ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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