Rapid7 Vulnerability & Exploit Database

TLS/SSL Server Is Using Commonly Used Prime Numbers

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TLS/SSL Server Is Using Commonly Used Prime Numbers

Severity
3
CVSS
(AV:N/AC:H/Au:N/C:N/I:P/A:N)
Published
05/20/2015
Created
07/25/2018
Added
11/12/2015
Modified
11/27/2018

Description

The server is using a common or default prime number as a parameter during the Diffie-Hellman key exchange. This makes the secure session vulnerable to a precomputation attack. An attacker can spend a significant amount of time to generate a lookup/rainbow table for a particular prime number. This lookup table can then be used to obtain the shared secret for the handshake and decrypt the session.

Solution(s)

  • tls-disable-common-primes

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