OpenSSL < 1.1.0 Default Weak 64-bit Block Cipher (SWEET32)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.

Synopsis :

The service running on the remote host uses a weak encryption block
cipher by default.

Description :

According to its banner, the version of OpenSSL running on the remote
host is prior to 1.1.0. It is, therefore, affected by a vulnerability,
known as SWEET32, in the 3DES and Blowfish algorithms due to the use
of weak 64-bit block ciphers by default. A man-in-the-middle attacker
who has sufficient resources can exploit this vulnerability, via a
'birthday' attack, to detect a collision that leaks the XOR between
the fixed secret and a known plaintext, allowing the disclosure of the
secret text, such as secure HTTPS cookies, and possibly resulting in
the hijacking of an authenticated session.

See also :

Solution :

Upgrade to OpenSSL version 1.1.0 or later, and ensure all 64-bit block
ciphers are disabled. Note that upgrading to OpenSSL 1.1.0 does not
completely mitigate this vulnerability; it simply disables the
vulnerable 64-bit block ciphers by default.

Risk factor :

Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 4.8
Public Exploit Available : true

Family: Web Servers

Nessus Plugin ID: 93112 ()

Bugtraq ID: 92630

CVE ID: CVE-2016-2183

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