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Category:   Application (Directory)  >   IBM Tivoli Directory Server Vendors:   IBM
IBM Tivoli Directory Server SSLv3 Decoding Function Lets Remote Users Decrypt TLS Traffic
SecurityTracker Alert ID:  1031426
SecurityTracker URL:  http://securitytracker.com/id/1031426
CVE Reference:   CVE-2014-8730   (Links to External Site)
Date:  Dec 23 2014
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in IBM Tivoli Directory Server. A remote user can decrypt TLS sessions in certain cases.

The system may accept incorrect TLS padding when terminating TLSv1 CBC connections. A remote user can with the ability to conduct a man-in-the-middle attack can force a client to use a vulnerable SSLv3 decoding function with TLS and then conduct a BEAST-style of attack to decrypt portions of the session.

This protocol vulnerability is a variant of the POODLE ("Padding Oracle On Downgraded Legacy Encryption") attack.

This is a flaw in the protocol rather than in the TLS implementation.

The original advisory is available at:

https://www.imperialviolet.org/2014/12/08/poodleagain.html

Brian Smith, Adam Langley, and Yngve Pettersen separately reported this vulnerability.

Impact:   A remote user with the ability to conduct a man-in-the-middle attack can decrypt TLS sessions.
Solution:   The vendor has issued a fix.

The vendor's advisories are available at:

http://www-01.ibm.com/support/docview.wss?uid=isg3T1021862
http://www-01.ibm.com/support/docview.wss?uid=swg21692906

Vendor URL:  www-01.ibm.com/support/docview.wss?uid=isg3T1021862 (Links to External Site)
Cause:   Access control error
Underlying OS:  UNIX (AIX)
Underlying OS Comments:  5.3, 6.1, 7.1

Message History:   None.


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