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AUSCERT External Security Bulletin Redistribution
ESB-2015.2014
Security Bulletin: Vulnerability in Diffie-Hellman ciphers
affects IBM Rational ClearCase (CVE-2015-4000)
4 August 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Rational ClearCase
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000
Reference: ESB-2015.1514
ESB-2015.1513
ESB-2015.1510
ESB-2015.1486
ESB-2015.1470
ESB-2015.1469
ESB-2015.1466
ESB-2015.1463
ESB-2015.1455.2
ESB-2015.1454.2
ESB-2015.1453.2
ESB-2015.1452
ESB-2015.1445
ESB-2015.1443
ESB-2015.1432
ESB-2015.1425
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21959111
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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM
Rational ClearCase (CVE-2015-4000)
Security Bulletin
Document information
More support for:
Rational ClearCase
Software version:
7.1, 7.1.0.1, 7.1.0.2, 7.1.1, 7.1.1.1, 7.1.1.2, 7.1.1.3, 7.1.1.4, 7.1.1.5,
7.1.1.6, 7.1.1.7, 7.1.1.8, 7.1.1.9, 7.1.2, 7.1.2.1, 7.1.2.2, 7.1.2.3, 7.1.2.4,
7.1.2.5, 7.1.2.6, 7.1.2.7, 7.1.2.8, 7.1.2.9, 7.1.2.10, 7.1.2.11, 7.1.2.12,
7.1.2.13, 7.1.2.14, 7.1.2.15, 7.1.2.16, 7.1.2.17, 7.1.2.18, 8.0, 8.0.0.1,
8.0.0.2, 8.0.0.3, 8.0.0.4, 8.0.0.5, 8.0.0.6, 8.0.0.7, 8.0.0.8, 8.0.0.9,
8.0.0.10, 8.0.0.11, 8.0.0.12, 8.0.0.13, 8.0.0.14, 8.0.0.15, 8.0.1, 8.0.1.1,
8.0.1.2, 8.0.1.3, 8.0.1.4, 8.0.1.5, 8.0.1.6, 8.0.1.7, 8.0.1.8
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Reference #:
1959111
Modified date:
2015-08-03
Summary
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key
exchange protocol affects IBM Rational ClearCase.
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 Rational ClearCase, versions 7.1.0.x, 7.1.1.x, 7.1.2.x, 8.0.0.x, 8.0.1.x,
in the following components:
Base CC/CQ V2 (Perl trigger-based) integration, when configured to use SSL
to communicate with a ClearQuest Web server (all platforms)
CMI and OSLC integrations, including UCM/ClearQuest integration via OSLC
(UNIX/Linux platforms), when configured to use SSL. (Windows CMI/OSLC clients
are not affected.)
ClearCase remote client: CCRC/CTE GUI, rcleartool, and CMAPI clients, when
using SSL to access a CCRC WAN Server/CM Server
Customer defined uses of SSL from ratlperl scripts
Remediation/Fixes
All fixes listed below require the latest published fix pack before applying
the rest of the fix.
Affected Versions Prerequisite before applying the fix
8.0.1 through 8.0.1.7 Install Rational ClearCase Fix Pack 8 (8.0.1.8) for 8.0.1
8.0 through 8.0.0.14 Install Rational ClearCase Fix Pack 15 (8.0.0.15) for 8.0
7.1.2 through 7.1.2.17 Customers on extended support contracts should install
Rational ClearCase Fix Pack 18 (7.1.2.18) for 7.1.2
7.1.1.x (all fix packs)
7.1.0.x (all fix packs) Customers on extended support contracts should contact
Rational Customer Support
CMI and OSLC change management integrations (UNIX/Linux platforms):
The solution is to update to the fix pack listed above, then contact
Rational Customer Support for a test fix with additional fixes for this issue.
Apply the fix pack and test fix to systems that use the CMI- and
OSLC-based integrations. This may include CCRC WAN servers that execute the
integrations on behalf of WAN clients.
Base CC/CQ Perl trigger-based (V2) integration
The solution is to update to the fix pack listed above, then contact
Rational Customer Support for a test fix with additional fixes for this issue.
The test fix includes OpenSSL version 1.0.1p. Apply the fix pack and test fix
to systems that run the Perl trigger-based (V2) integration, and those that
run your ratlperl scripts that use OpenSSL.
Customer defined uses of SSL from ratlperl scripts
The solution is to update to the fix pack listed above, then contact
Rational Customer Support for a test fix with additional fixes for this issue.
The test fix includes OpenSSL version 1.0.1p. Apply the fix pack and test fix
to systems that run your ratlperl scripts that use OpenSSL.
Alternatively, you may disable the use of the ephemeral DH key ciphers
(EDH, DHE) when you use IO::Socket::SSL. The SSL_cipher_list setting
configures permissible ciphers for use by OpenSSL. You can view the
documentation with:
ratlperl -e "use Pod::Perldoc; Pod::Perldoc->run();" IO::Socket::SSL
You can view the Base CC/CQ Perl trigger-based (V2) integration for an
example, in the script module <ccase-home-dir>/lib/CQCC/CQWebJavaParser.pm.
See the InitAgent method that disables RC4 in this way.
ClearCase remote client: CCRC/CTE GUI, rcleartool, CMAPI clients
The solution is to update to the fix pack listed above, then contact
Rational Customer Support for a test fix with additional fixes for this issue.
Apply the fix pack and test fix to systems that run CCRC/CTE GUI, rcleartool,
or CMAPI clients, such as web view and automatic view developer desktops.
Notes:
If you use CCRC as an extension offering installed into an Eclipse
shell (one not provided as part of a ClearCase release), or you use rcleartool
or CMAPI using a Java Virtual Machine not supplied by IBM as part of Rational
ClearCase, you should update the Java Virtual Machine you use to include a fix
for the above issues (enforcing minimum key length for temporary keys used in
Diffie-Hellman key exchange). Contact the supplier of your Java Virtual
Machine.
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.
For unsupported versions, IBM recommends upgrading to a fixed, supported
version/release/platform of the product.
Workarounds and Mitigations
None
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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
Acknowledgement
Reported to IBM by The WeakDH team at https://weakdh.org
Change History
*3 August 2015: Original copy 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.
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