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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.1535 Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Cognos Business Intelligence (CVE-2015-4000) 12 June 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Cognos Business Intelligence Publisher: IBM Operating System: AIX HP Itanium HP-UX Linux variants Solaris Windows Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2015-4000 Reference: ESB-2015.1513 ESB-2015.1510 ESB-2015.1486 ESB-2015.1470 ESB-2015.1469 ESB-2015.1466 ESB-2015.1463 ESB-2015.1455 ESB-2015.1454 ESB-2015.1453 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=swg21959671 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Cognos Business Intelligence (CVE-2015-4000) Security Bulletin Document information More support for: Cognos Business Intelligence Software version: 8.4.1, 10.1, 10.1.1, 10.2, 10.2.1, 10.2.2 Operating system(s): AIX, HP Itanium, HP-UX, Linux, Solaris, Windows Reference #: 1959671 Modified date: 2015-06-11 Summary The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM Cognos Business Intelligence 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 Cognos Business Intelligence Server 10.2.2 IBM Cognos Business Intelligence Server 10.2.1.1 IBM Cognos Business Intelligence Server 10.2 IBM Cognos Business Intelligence Server 10.1.1 IBM Cognos Business Intelligence Server 10.1 IBM Cognos Business Intelligence Server 8.4.1 Remediation/Fixes None Workarounds and Mitigations The DH cipher suites must be disabled using Cognos Configuration by performing the following actions: 1) Start Cognos Configuration. 2) Navigate to Security/Cryptography/Cognos 3) Open the supported cipher suites selection dialog. 4) Select all cipher suites that have DH in the the name and remove them from the Current Values List. Select OK to save the new list. 5) Save and restart your service using Cognos Configuration. You should verify applying this configuration change does not cause any compatibility issues. Not disabling the DH stream cipher 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 DH stream cipher 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. 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 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 11 June 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. - --------------------------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 auscert@auscert.org.au 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. 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