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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1684
        Security Bulletin: Vulnerability in Diffie-Hellman ciphers
                affects IBM API Management (CVE-2015-4000)
                               29 June 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM API Management
Publisher:         IBM
Operating System:  Network Appliance
                   VMware ESX Server
                   Citrix XenServer
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-4000  

Reference:         ESB-2015.1673
                   ESB-2015.1671
                   ESB-2015.1670
                   ESB-2015.1669
                   ESB-2015.1663
                   ESB-2015.1655
                   ESB-2015.1640
                   ESB-2015.1623
                   ESB-2015.1614

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21959536

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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM API 
Management (CVE-2015-4000)

Document information

More support for:

IBM API Management

Software version:

2.0, 3.0, 4.0

Operating system(s):

Platform Independent

Reference #:

1959536

Modified date:

2015-06-26

Security Bulletin

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key 
exchange protocol affects IBM API Management

Vulnerability Details

CVEID: CVE-2015-4000

DESCRIPTION: The TLS protocol could allow a remote attacker to obtain 
sensitive information, caused by the failure to properly convey a DHE_EXPORT 
ciphersuite choice. An attacker could exploit this vulnerability using 
man-in-the-middle techniques to force a downgrade to 512-bit export-grade 
cipher. Successful exploitation could allow an attacker to recover the session
key as well as modify the contents of the traffic. This vulnerability is 
commonly referred to as "Logjam".

CVSS Base Score: 4.3

CVSS Temporal Score: See 
https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 for the current 
score

CVSS Environmental Score*: Undefined

CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)

Affected Products and Versions

IBM API Management V2.0, V3.0 and V4.0

Remediation/Fixes

Product 		VRMF 		APAR 		Remediation/First Fix

IBM API Management 	2.0.0 		LI78649 	Apply V2.0.0.2 cumulative ifix 014

IBM API Management 	3.0.0 		LI78649 	Apply V3.0.4.2 cumulative interim fix 001

IBM API Management 	4.0.0 		LI78649 	Apply V4.0.1.0 cumulative ifix 002

You should verify applying this configuration change does not cause any 
compatibility issues. If you change the default setting after applying the 
fix, you will expose yourself to the attack described above. IBM recommends 
that you review your entire environment to identify other areas where you have
enabled the Diffie-Hellman key-exchange protocol used in TLS and take 
appropriate mitigation and remediation actions

Workarounds and Mitigations

You should verify applying this configuration change does not cause any 
compatibility issues. If you change the default setting after applying the 
fix, you will expose yourself to the attack described above. IBM recommends 
that you review your entire environment to identify other areas where you have
enabled the Diffie-Hellman key-exchange protocol used in TLS and take 
appropriate mitigation and remediation actions.

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support 
alerts like this.

References

Complete CVSS Guide

On-line Calculator V2

Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog

Acknowledgement

Reported to IBM by The WeakDH team at https://weakdh.org

Change History

25 June 2015: Original Version Published

26 June 2015: Updated with links to V3.0.4.2 interim fix

*The CVSS Environment Score is customer environment specific and will 
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the 
Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the 
Common Vulnerability Scoring System (CVSS) is an "industry open standard 
designed to convey vulnerability severity and help to determine urgency and 
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY 
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT 
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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