Specifically this adds a check for a strong Diffie Hellman Group.
Mitigating Logjam involves all these three, but 1) and 2) are caught by
other existing checks:
1) Disable Export Cipher Suites
2) Deploy (Ephemeral) Elliptic-Curve Diffie-Hellman (ECDHE)
3) Use a Strong, Diffie Hellman Group
(source: https://weakdh.org/sysadmin.html)
Specifically this adds a check for a strong Diffie Hellman Group.
Mitigating Logjam involves all these three, but 1) and 2) are caught by other existing checks: 1) Disable Export Cipher Suites 2) Deploy (Ephemeral) Elliptic-Curve Diffie-Hellman (ECDHE) 3) Use a Strong, Diffie Hellman Group (source: https://weakdh.org/sysadmin.html)