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AUSCERT External Security Bulletin Redistribution
ESB-2015.1949
Security Bulletin: Vulnerabilities in OpenSSL including Logjam affect
Rational Software Architect for WebSphere Software
(CVE-2015-4000, CVE-2015-1793)
24 July 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Rational Software Architect
Publisher: IBM
Operating System: Linux variants
OS X
Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000 CVE-2015-1793
Reference: ASB-2015.0072
ASB-2015.0070
ASB-2015.0066
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21962680
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Security Bulletin: Vulnerabilities in OpenSSL including Logjam affect Rational
Software Architect for WebSphere Software (CVE-2015-4000, CVE-2015-1793)
Security Bulletin
Document information
More support for:
Rational Software Architect
Modeling
Software version:
9.1, 9.1.1, 9.1.2
Operating system(s):
Linux, OS X, Windows
Reference #:
1962680
Modified date:
2015-07-22
Summary
OpenSSL vulnerabilities were disclosed by the OpenSSL Project and affect
Rational Software Architect for WebSphere Software. This includes the Logjam
Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol
(CVE-2015-4000). This also includes the alternate chains certificate forgery
vulnerability (CVE-2015-1793). Rational Software Architect for WebSphere
Software has addressed the applicable CVEs.
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)
CVEID: CVE-2015-1793
DESCRIPTION: OpenSSL could allow a remote attacker to bypass security
restrictions, caused by an implementation error of the alternative certificate
chain logic. An attacker could exploit this vulnerability to bypass the CA
flag and other specific checks on untrusted certificates and issue an invalid
certificate.
CVSS Base Score: 7.5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/104500 for the current
score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
Affected Products and Versions
IBM Rational Software Architect for WebSphere Software 9.1, 9.1.1 and 9.1.2
Remediation/Fixes
Update the IBM SDK for Node.js using by the Cordova platform in the product to
address this vulnerability:
Product VRMF APAR Remediation/First Fix
Rational Software Architect 9.1, 9.1.1, and 9.1.2 Apply IBM SDK for Node.js Version 1.1 release updated equivalent to
the Joyent Node.js API version 0.10.40 to the Cordova platform in the product.
Installation instructions for applying the update to the Cordova
platform in the product can be found here:
Upgrading the IBM SDK for Node.js used by Cordova
For CVE-2015-4000: As the length of the server key size are increased, the
amount of CPU required for full TLS/SSL handshake can significantly increase.
Please carefully test and assess the impact to your CPU requirements to ensure
sufficient CPU resources, otherwise the system availability may be impacted.
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
None
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alerts like this.
References
Complete CVSS Guide
On-line Calculator V2
Complete CVSS Guide
On-line Calculator V2
OpenSSL Project vulnerability website
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
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
*21 July 2015: Original copy submitted
*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.
*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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