stunnel < 5.14 Authentication Bypass Vulnerability

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

The remote Windows host contains a program that is affected by an
authentication bypass vulnerability.

Description :

The version of stunnel installed on the remote host is prior to
version 5.14. It is, therefore, affected by a vulnerability related
to the handling of authentication failures that involve the 'redirect'
option. In this case, only the initial connection is forwarded to the
hosts specified with 'redirect'; however, subsequent connections
established with reused SSL/TLS sessions are forwarded to the hosts
specified with 'connect' as if they were already successfully
authenticated. A remote attacker can exploit this vulnerability to
bypass authentication mechanisms.

Note that Nessus has not tested for this issue but has instead relied
only on the application's self-reported version number.

See also :

https://www.stunnel.org/CVE-2015-3644.html

Solution :

Upgrade to stunnel 5.14 or later. Alternatively, remove the 'redirect'
option from the configuration file.

Risk factor :

Medium / CVSS Base Score : 5.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N)
CVSS Temporal Score : 5.8
(CVSS2#E:ND/RL:ND/RC:ND)
Public Exploit Available : false

Family: Windows

Nessus Plugin ID: 83730 ()

Bugtraq ID: 74659

CVE ID: CVE-2015-3644

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