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AUSCERT External Security Bulletin Redistribution
ESB-2015.2628
Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects
RSA-based security in WebSphere Transformation Extender
Secure Adapter Collection (CVE-2015-4000)
19 October 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM WebSphere Transformation Extender
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000
Reference: ASB-2015.0070
ASB-2015.0066
ESB-2015.2611
ESB-2015.2488
ESB-2015.1445
ESB-2015.1443
ESB-2015.1432
ESB-2015.1425
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21968621
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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects RSA-based
security in WebSphere Transformation Extender Secure Adapter Collection
(CVE-2015-4000)
Document information
More support for:
WebSphere Transformation Extender
Secure Adapter Collection
Software version:
8.2.0.0, 8.2.0.1, 8.2.0.2, 8.2.0.3, 8.2.0.4, 8.2.0.5, 8.2.0.6, 8.3.0.0,
8.3.0.1, 8.3.0.2, 8.3.0.3, 8.3.0.4, 8.3.0.5, 8.3.0.6, 8.4.0.0, 8.4.0.1,
8.4.0.2, 8.4.0.3, 8.4.0.4, 8.4.0.5, 8.4.1.0, 8.4.1.1, 8.4.1.2, 8.4.1.3
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Reference #:
1968621
Modified date:
2015-10-16
Security Bulletin
Summary
The RSA-based security in WebSphere Transformation Extender Secure Adapter
Collection is vulnerable to the Logjam Attack on TLS connections using
the Diffie-Hellman (DH) key exchange protocol (CVE-2015-4000).
Vulnerability Details
The RSA-based security software contained in WebSphere Transformation
Extender Secure Adapter Collection is vulnerable to the following CVE:
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)
Note that the IBM Security Kit (GSKit) based security software now available
for the product is not vulnerable to this CVE.
Affected Products and Versions
The following WebSphere Transformation Extender Secure Adapter Collection
versions are affected:
* 8.2.0.0 - 8.2.0.6
* 8.3.0.0 - 8.3.0.6
* 8.4.0.0 - 8.4.0.5
* 8.4.1.0 - 8.4.1.3
Remediation/Fixes
For the following versions, download and install the interim fix for APAR
PI50395 from IBM Fix Central:
* 8.3.0.0 - 8.3.0.6
* 8.4.0.0 - 8.4.0.5
* 8.4.1.0 - 8.4.1.3
For the following versions, please request the fix from IBM Support:
* 8.2.0.0 - 8.2.0.6
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.
Note that all WebSphere Transformation Extender customers who use the
Secure Adapter Collection must migrate from using RSA software to using
IBM Global Security Kit (GSKit) as soon as possible. The RSA software is
under limited support, and will receive no support after March 15, 2016. For
more information see www.ibm.com/support/docview.wss?uid=swg21965321.
Workarounds and Mitigations
None.
Get Notified about Future Security Bulletins
Subscribe to My Notifications to be notified of important product support
alerts like this.
Important note
IBM strongly suggests that all System z customers be subscribed to the
System z Security Portal to receive the latest critical System z security
and integrity service. If you are not subscribed, see the instructions
on the System z Security web site. Security and integrity APARs and
associated fixes will be posted to this portal. IBM suggests reviewing
the CVSS scores and applying all security or integrity fixes as soon as
possible to minimize any potential risk.
References
Complete CVSS v2 Guide
On-line Calculator v2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
16 Oct 2015: Original version published.
*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.
Product Alias/Synonym
WTX
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