Vulnerability Details

SSL/TLS: Diffie-Hellman Key Exchange Insufficient DH Group Strength Vulnerability

Published: 2016-09-06 05:25:58

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

Summary:
The SSL/TLS service uses Diffie-Hellman groups with insufficient strength (key size < 2048).

Technical Details:
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.

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

Recommendations:
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.

Detection Method:
Checks the DHE temporary public key size.

Detection Type:
Remote Banner

Solution Type:
Workaround

References:

https://weakdh.org/
https://weakdh.org/sysadmin.html

Severity
Medium
CVSS Score
4.0
Published
2016-09-06
Modified
2018-12-21
Category
SSL and TLS

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