-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
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
Operating System: Windows
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2015-4000
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM
Rational RequisitePro (CVE-2015-4000)
More support for:
7.1, 188.8.131.52, 184.108.40.206, 7.1.1, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52,
184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 7.1.2, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11,
18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124,
126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 7.1.3, 126.96.36.199,
188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206,
220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 7.1.4, 220.127.116.11,
18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key
exchange protocol affects IBM Rational RequisitePro.
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
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.
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 22.214.171.124 Install Rational RequisitePro Fix Pack 8 (126.96.36.199) for 7.1.4
7.1.3 through 188.8.131.52 Install Rational RequisitePro Fix Pack 15 (184.108.40.206) for 7.1.3
7.1.2.x (all fix packs) Install Rational RequisitePro Fix Pack 18 (220.127.116.11) for 7.1.2. Note: 18.104.22.168
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.
Complete CVSS v2 Guide
On-line Calculator v2
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
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.
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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to email@example.com
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----