SSH Diffie-Hellman Modulus <= 1024 Bits (Logjam)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote host allows SSH connections with one or more Diffie-Hellman
moduli less than or equal to 1024 bits.

Description :

The remote SSH server allows connections with one or more
Diffie-Hellman moduli less than or equal to 1024 bits. Through
cryptanalysis, a third party can find the shared secret in a short
amount of time (depending on modulus size and attacker resources).
This allows an attacker to recover the plaintext or potentially
violate the integrity of connections.

See also :

http://weakdh.org/
https://stribika.github.io/2015/01/04/secure-secure-shell.html

Solution :

Reconfigure the service to use a unique Diffie-Hellman moduli of 2048
bits or greater.

Risk factor :

Low / CVSS Base Score : 2.6
(CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N)

Family: Misc.

Nessus Plugin ID: 86328 ()

Bugtraq ID: 74733

CVE ID: CVE-2015-4000

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