This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.
The remote service supports the use of 64-bit block ciphers.
The remote host supports the use of a block cipher with 64-bit blocks
in one or more cipher suites. It is, therefore, affected by a
vulnerability, known as SWEET32, due to the use of weak 64-bit block
ciphers. 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
Proof-of-concepts have shown that attackers can recover authentication
cookies from an HTTPS session in as little as 30 hours.
Note that the ability to send a large number of requests over the
same TLS connection between the client and server is an important
requirement for carrying out this attack. If the number of requests
allowed for a single connection were limited, this would mitigate the
vulnerability. However, Nessus has not checked for such a mitigation.
See also :
Reconfigure the affected application, if possible, to avoid use of all
64-bit block ciphers. Alternatively, place limitations on the number
of requests that are allowed to be processed over the same TLS
connection to mitigate this vulnerability.
Risk factor :
Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 4.8
Public Exploit Available : true