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Test ID:1.3.6.1.4.1.25623.1.0.106223
Category:SSL and TLS
Title:SSL/TLS: Diffie-Hellman Key Exchange Insufficient DH Group Strength Vulnerability
Summary:The SSL/TLS service uses Diffie-Hellman groups with insufficient strength; (key size < 2048).
Description:Summary:
The SSL/TLS service uses Diffie-Hellman groups with insufficient strength
(key size < 2048).

Vulnerability Insight:
The Diffie-Hellman group are some big numbers that are used as base for
the DH computations. They can be, and often are, fixed. The security of the final secret depends on the size
of these parameters. It was found that 512 and 768 bits to be weak, 1024 bits to be breakable by really
powerful attackers like governments.

Vulnerability Impact:
An attacker might be able to decrypt the SSL/TLS communication offline.

Solution:
Deploy (Ephemeral) Elliptic-Curve Diffie-Hellman (ECDHE) or use
a 2048-bit or stronger Diffie-Hellman group (see the references).

For Apache Web Servers:
Beginning with version 2.4.7, mod_ssl will use DH parameters which include primes with lengths of more than 1024 bits.

CVSS Score:
4.0

CVSS Vector:
AV:N/AC:H/Au:N/C:P/I:P/A:N

CopyrightCopyright (C) 2016 Greenbone Networks GmbH

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