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Category:   Application (Generic)  >   IBM iNotes and Domino Vendors:   IBM
IBM Lotus Notes and Domino TLS Diffie-Hellman Export Cipher Downgrade Attack Lets Remote Users Decrypt Connections
SecurityTracker Alert ID:  1033019
SecurityTracker URL:  http://securitytracker.com/id/1033019
CVE Reference:   CVE-2015-4000   (Links to External Site)
Date:  Jul 22 2015
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.5, 8.5.1, 8.5.1.5, 8.5.2, 8.5.2.4, 8.5.3, 8.5.3.6, 9.0, 9.0.1, 9.0.1.4
Description:   A vulnerability was reported in IBM Lotus Notes and Domino. A remote user may be able to decrypt TLS connections in certain situations.

A remote user that can conduct a man-in-the-middle attack can cause the target system to downgrade the Diffie-Hellman algorithm to 512-bit export-grade cryptography. The remote user may then be able to decrypt the connection.

This vulnerability resides in the TLS protocol and not in the specific TLS implementation, but the vulnerability is exposed because the target system supports export-grade ciphers.

This attack is known as the "Logjam" attack.

The original advisory is available at:

https://weakdh.org/imperfect-forward-secrecy.pdf

David Adrian, Karthikeyan Bhargavan, Zakir Durumeric, Pierrick Gaudry, Matthew Green, J. Alex Halderman, Nadia Heninger, Drew Springall, Emmanuel Thome, Luke Valenta, Benjamin VanderSloot, Eric Wustrow, Santiago Zanella-Beguelin, and Paul Zimmermann reported this vulnerability.

Impact:   A remote user that can conduct a man-in-the-middle attack can cause the target system to use weak cryptography that can be decrypted.
Solution:   The vendor has issued a fix (8.5.3 Fix Pack 6 plus Interim Fixes, 9.0.1 Fix Pack 4 plus Interim Fix).

The vendor has assigned SPR# KLYH9Y7PWX to this vulnerability.

The vendor's advisory is available at:

http://www-01.ibm.com/support/docview.wss?uid=swg21960614

Vendor URL:  www-01.ibm.com/support/docview.wss?uid=swg21960614 (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Any), UNIX (AIX), Windows (Any)

Message History:   None.


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