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Category:   OS (UNIX)  >   IBM AIX Vendors:   IBM
(IBM Issues Fix for IBM AIX) IBM Tivoli Directory Server TLS Export Cipher Bug Lets Remote Users Downgrade Session Security
SecurityTracker Alert ID:  1032103
SecurityTracker URL:  http://securitytracker.com/id/1032103
CVE Reference:   CVE-2015-0138   (Links to External Site)
Date:  Apr 14 2015
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5.3, 6.1, 7.1
Description:   A vulnerability was reported in IBM Tivoli Directory Server. A remote user can downgrade the TLS session security and potentially recover keys. IBM AIX is affected.

A remote user that can conduct a man-in-the-middle attack can force a downgrade to an export-grade cipher suite and then conduct a key factoring attack to recover the target server's RSA private key. The remote user can then determine the TLS master key for that session.

[Editor's note: This is known as a "FREAK" attack.]

For servers or applications that re-use an export-grade RSA private key across multiple sessions, the remote user can then recover or modify the plaintext for all of those sessions.

The original advisory is available at:

https://www.smacktls.com/#freak

The miTLS Team reported this vulnerability.

Impact:   A remote user can downgrade the session security and then conduct a key factoring attack to recover the target server's export-grade RSA private key and to obtain the TLS master key for that session.
Solution:   IBM has issued a fix for IBM AIX.

The IBM advisory is available at:

https://aix.software.ibm.com/aix/efixes/security/javajsse_advisory.asc

Vendor URL:  www-01.ibm.com/support/docview.wss?uid=isg3T1022075 (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Mar 16 2015 IBM Tivoli Directory Server TLS Export Cipher Bug Lets Remote Users Downgrade Session Security



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