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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2124
        Security Bulletin: Vulnerability in Diffie-Hellman ciphers
             affects IBM Rational RequisitePro (CVE-2015-4000)
                              14 August 2015

===========================================================================

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

Product:           IBM Rational RequisitePro
Publisher:         IBM
Operating System:  Windows
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
                   Unauthorised Access            -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-4000  

Reference:         ASB-2015.0070
                   ASB-2015.0066
                   ESB-2015.2108
                   ESB-2015.2104
                   ESB-2015.2103
                   ESB-2015.2088
                   ESB-2015.2083
                   ESB-2015.2054
                   ESB-2015.2051
                   ESB-2015.2040
                   ESB-2015.2038
                   ESB-2015.2027

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21960340

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

Document information

More support for:

Rational RequisitePro

SSL

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, 7.1.3, 7.1.3.1, 
7.1.3.2, 7.1.3.3, 7.1.3.4, 7.1.3.5, 7.1.3.6, 7.1.3.7, 7.1.3.8, 7.1.3.9, 
7.1.3.10, 7.1.3.11, 7.1.3.12, 7.1.3.13, 7.1.3.14, 7.1.3.15, 7.1.4, 7.1.4.1, 
7.1.4.2, 7.1.4.3, 7.1.4.4, 7.1.4.5, 7.1.4.6, 7.1.4.7, 7.1.4.8

Operating system(s):

Windows

Reference #:

1960340

Modified date:

2015-08-13

Security Bulletin

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key 
exchange protocol affects IBM Rational RequisitePro.

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 RequisitePro, versions 7.1.0.x, 7.1.1.x, 7.1.2.x, 7.1.3.x, 
7.1.4.x, in the following components:

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

7.1.4 through 7.1.4.7		Install Rational RequisitePro Fix Pack 8 (7.1.4.8) for 7.1.4

7.1.3 through 7.1.3.14		Install Rational RequisitePro Fix Pack 15 (7.1.3.15) for 7.1.3

7.1.2.x (all fix packs)		Install Rational RequisitePro Fix Pack 18 (7.1.2.18) for 7.1.2. Note: 7.1.2.18	
7.1.1.x (all fix packs)		interoperates with all 7.1.x.x systems, and can be installed in the same way 
7.1.0.x (all fix packs)		as 7.1.x.x fix packs.

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.

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 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

*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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