stunnel < 5.02 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 5.02. It is, therefore, affected by the following
vulnerabilities :

- An error exists in the ssl3_read_bytes() function that
allows data to be injected into other sessions or allows
denial of service attacks. Note this issue is only
exploitable if 'SSL_MODE_RELEASE_BUFFERS' is enabled.
(CVE-2010-5298)

- A buffer overflow error exists related to invalid DTLS
fragment handling that allows an attacker to execute
arbitrary code. Note this issue only affects OpenSSL
when used as a DTLS client or server. (CVE-2014-0195)

- An error exists in the do_ssl3_write() function that
allows a NULL pointer to be dereferenced, resulting in a
denial of service condition. Note this issue is
exploitable only if 'SSL_MODE_RELEASE_BUFFERS' is
enabled. (CVE-2014-0198)

- An error exists related to DTLS handshake handling that
could lead to denial of service attacks. Note this
issue only affects OpenSSL when used as a DTLS client.
(CVE-2014-0221)

- An unspecified error exists that allows an attacker to
cause usage of weak keying material, resulting in
simplified man-in-the-middle attacks. (CVE-2014-0224)

- An unspecified error exists related to anonymous ECDH
ciphersuites that allows an attacker to cause a denial
of service condition. Note this issue only affects
OpenSSL TLS clients. (CVE-2014-3470)

Note that Nessus has not tested for these issues 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?6ba4dbbe
https://www.openssl.org/news/secadv/20140605.txt

Solution :

Upgrade to stunnel version 5.02 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 : 7.3
(CVSS2#E:POC/RL:OF/RC:ND)
Public Exploit Available : true

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