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Category:   Application (Web Server/CGI)  >   IBM WebSphere Vendors:   IBM
(IBM Issues Advisory for IBM WebSphere Portal) IBM WebSphere Application Server Community Edition TLS Diffie-Hellman Export Cipher Downgrade Attack Lets Remote Users Decrypt Connections
SecurityTracker Alert ID:  1033411
SecurityTracker URL:  http://securitytracker.com/id/1033411
CVE Reference:   CVE-2015-4000   (Links to External Site)
Date:  Aug 28 2015
Impact:   Modification of authentication information
Vendor Confirmed:  Yes  
Version(s): Portal version 6.1, 7.0, 8.0, 8.5
Description:   A vulnerability was reported in IBM WebSphere Application Server Community Edition. A remote user may be able to decrypt TLS connections in certain situations. IBM WebSphere Portal is affected.

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:   IBM WebSphere Portal is affected.

No solution was available at the time of this entry.

The IBM advisory is available at:

http://www-01.ibm.com/support/docview.wss?uid=swg21964341

Vendor URL:  www-01.ibm.com/support/docview.wss?uid=swg21964341 (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Any), UNIX (AIX), UNIX (HP/UX), UNIX (Solaris - SunOS), Windows (Any)

Message History:   This archive entry is a follow-up to the message listed below.
Jun 19 2015 IBM WebSphere Application Server Community Edition TLS Diffie-Hellman Export Cipher Downgrade Attack Lets Remote Users Decrypt Connections



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