OpenSSL 1.1.0 < 1.1.0e Encrypt-Then-Mac Extension DoS

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


Synopsis :

A service running on the remote host is affected by a denial of
service vulnerability.

Description :

According to its banner, the version of OpenSSL running on the remote
host is 1.1.0 prior to 1.1.0e. It is, therefore, affected by a denial
of service vulnerability that is triggered during a renegotiation
handshake in which the Encrypt-Then-Mac extension is negotiated when
it was not in the original handshake or vice-versa. An
unauthenticated, remote attacker can exploit this issue to cause
OpenSSL to crash, depending on which cipher suite is being used. Note
that both clients and servers are affected.

See also :

https://www.openssl.org/news/secadv/20170216.txt

Solution :

Upgrade to OpenSSL version 1.1.0e or later.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.4
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Web Servers

Nessus Plugin ID: 97328 ()

Bugtraq ID:

CVE ID: CVE-2017-3733

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