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Debian Security Advisory DSA 3299-1 (stunnel4 - security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
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.
Affected Software
Affected Software
stunnel4 on Debian Linux
Detection Method
Detection Method
This check tests the installed software version using the apt package manager.
Solution
Solution
For the stable distribution (jessie), this problem has been fixed in version 3:5.06-2+deb8u1. For the testing distribution (stretch), this problem has been fixed in version 3:5.18-1. For the unstable distribution (sid), this problem has been fixed in version 3:5.18-1. We recommend that you upgrade your stunnel4 packages.