stunnel < 5.03 OpenSSL Multiple Vulnerabilities

This script is Copyright (C) 2014-2016 Tenable Network Security, Inc.


Synopsis :

The remote Windows host contains a program that is affected by
multiple vulnerabilities.

Description :

The version of stunnel installed on the remote host is prior to
version 5.03. It is, therefore, affected by the following
vulnerabilities in the bundled OpenSSL library :

- A memory double-free error exists related to handling
DTLS packets that allows denial of service attacks.
(CVE-2014-3505)

- An unspecified error exists related to handling DTLS
handshake messages that allows denial of service attacks
due to large amounts of memory being consumed.
(CVE-2014-3506)

- A memory leak error exists related to handling
specially crafted DTLS packets that allows denial of
service attacks. (CVE-2014-3507)

- An error exists related to 'OBJ_obj2txt' and the pretty
printing 'X509_name_*' functions which leak stack data,
resulting in an information disclosure. (CVE-2014-3508)

- An error exists related to 'ec point format extension'
handling and multithreaded clients that allows freed
memory to be overwritten during a resumed session.
(CVE-2014-3509)

- A NULL pointer dereference error exists related to
handling anonymous ECDH cipher suites and crafted
handshake messages that allow denial of service attacks
against clients. (CVE-2014-3510)

- An error exists related to handling fragmented
'ClientHello' messages that could allow a
man-in-the-middle attacker to force usage of TLS 1.0
regardless of higher protocol levels being supported by
both the server and the client. (CVE-2014-3511)

- A buffer overflow error exists related to handling
Secure Remote Password protocol (SRP) parameters having
unspecified impact. (CVE-2014-3512)

- A NULL pointer dereference error exists related to
handling Secure Remote Password protocol (SRP) that
allows a malicious server to crash a client, resulting
in a denial of service. (CVE-2014-5139

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

See also :

http://stunnel.org/?page=sdf_ChangeLog
http://www.nessus.org/u?bfb06a2c
https://www.openssl.org/news/secadv/20140806.txt

Solution :

Upgrade to stunnel version 5.03 or later.

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.9
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

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