IBM Domino 8.5.x / 9.0.x < 9.0.1 Fix Pack 8 TLS Server Diffie-Hellman Key Validation MitM
Medium Nessus Plugin ID 100682
SynopsisA business collaboration application running on the remote host is affected by a key validation vulnerability.
DescriptionAccording to its banner, the version of IBM Domino (formerly IBM Lotus Domino) running on the remote host is 8.5.x or 9.0.x prior to 9.0.1 Fix Pack 8. It is, therefore, affected by a flaw in the TLS server due to improper validation of Diffie-Hellman parameters. A man-in-the-middle (MitM) attacker can exploit this, via a small subgroup attack, to more easily break the encryption and thereby compromise the connection between the server and clients, resulting in the disclosure of user authentication credentials.
SolutionUpgrade to IBM Domino version 9.0.1 Fix Pack 8 or later.
Note that users who remain on the following releases may open a service request with IBM Support for a custom hotfix :
- version 9.0.1 through 9.0.1 Fix Pack 7 Interim Fix 2
- version 9.0 through 9.0 Interim Fix 7