Description

openvpn-auth-oauth2 is a plugin/management interface client for OpenVPN server to handle an OIDC based single sign-on (SSO) auth flows. From version 1.26.3 to before version 1.27.3, when openvpn-auth-oauth2 is deployed in the experimental plugin mode (shared library loaded by OpenVPN via the plugin directive), clients that do not support WebAuth/SSO (e.g., the openvpn CLI on Linux) are incorrectly admitted to the VPN despite being denied by the authentication logic. The default management-interface mode is not affected because it does not use the OpenVPN plugin return-code mechanism. This issue has been patched in version 1.27.3.

Type de vulnérabilité

• CWE-287

Vecteur d'attaque

Complexité : LOW

Privilèges requis : NONE

Interaction utilisateur : NONE

Impact

• Confidentialité : HIGH
• Intégrité : HIGH
• Disponibilité : NONE

Recommandations

Appliquer les correctifs de sécurité fournis par le vendeur dès que possible.