DSA-3299-1 stunnel4 -- stunnel4ID: oval:org.secpod.oval:def:602158 | Date: (C)2015-07-08 (M)2021-06-06 |
Class: PATCH | Family: unix |
Johan Olofsson discovered an authentication bypass vulnerability in Stunnel, a program designed to work as an universal SSL tunnel for network daemons. When Stunnel in server mode is used with the redirect option and certificate-based authentication is enabled with "verify = 2" or higher, then only the initial connection is redirected to the hosts specified with "redirect". This allows a remote attacker to bypass authentication.