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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.
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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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