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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1683
  Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM
Cognos Command Center (CVE-2015-4000) and Security Bulletin: Vulnerability
  in Diffie-Hellman ciphers affects IBM Cognos Controller (CVE-2015-4000)
                               29 June 2015

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

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

Product:           IBM Cognos Command Center
                   IBM Cognos Controller
Publisher:         IBM
Operating System:  Windows
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-4000  

Reference:         ESB-2015.1673
                   ESB-2015.1671
                   ESB-2015.1670
                   ESB-2015.1669
                   ESB-2015.1663
                   ESB-2015.1655
                   ESB-2015.1640
                   ESB-2015.1623
                   ESB-2015.1614

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21960508
   http://www-01.ibm.com/support/docview.wss?uid=swg21960454

Comment: This bulletin contains two (2) IBM security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Cognos
Command Center (CVE-2015-4000)

Document information

More support for:

Cognos Command Center

Software version:

10.1, 10.2, 10.2.1, 10.2.2

Operating system(s):

Windows

Reference #:

1960508

Modified date:

2015-06-27

Security Bulletin

Summary

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

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 Command Center 10.2.2

IBM Cognos Command Center 10.2.1

IBM Cognos Command Center 10.2

IBM Cognos Command Center 10.1

Remediation/Fixes

The recommended solution is to apply the IBM JRE 6.0 SR16FP5 to the following
versions of

   IBM Cognos Command Center:

   IBM Cognos Command Center 10.2.2

   IBM Cognos Command Center 10.2.1

   IBM Cognos Command Center 10.2

   IBM Cognos Command Center 10.1

The fix for all affected versions is found here: 
http://www.ibm.com/support/fixcentral/swg/quickorder?parent=Cognos&product=ibm/Information+Management/Cognos+Command+Center&release=10.2.2&platform=Windows+32-bit,+x86&function=fixId&fixids=10.2.2-BA-CCC-Win32-JRE-60SR16FP5

Installation instructions for applying this fix.

For Microsoft Windows servers where the Agent or Server component is 
installed.

1. Download the 32 bit IBM Java JRE (file name: ibm-java-jre-60-win-i386.zip, 
   Size: 75 MB).

2. Stop the CccServer, CccQueue and CccAgent Microsoft Windows services.

3. For IBM Cognos Command Center 10.1 and 10.2: Rename the 
   <INSTALLDIR>\Common\java directory to <INSTALLDIR>\Common\java.orig

4. For IBM Cognos Command Center 10.2.1: Rename the 
   <INSTALLDIR>\Common\java.6.0.16.0 directory to 
   <INSTALLDIR>\Common\java.6.0.16.0.orig

5. For IBM Cognos Command Center 10.2.2: Rename the 
   <INSTALLDIR>\Common\java.6.0.16 directory to 
   <INSTALLDIR>\Common\java.6.0.16.orig

6. For IBM Cognos Command Center 10.1 and 10.2: Unpack the content of the 
   ibm-java-jre-60-win-i386.zip file to <INSTALLDIR>\Common\java

7. For IBM Cognos Command Center 10.2.1: Unpack the content of the 
   ibm-java-jre-60-win-i386.zip file to <INSTALLDIR>\Common\java.6.0.16.0

8. For IBM Cognos Command Center 10.2.2: Unpack the content of the 
   ibm-java-jre-60-win-i386.zip file to <INSTALLDIR>\Common\java.6.0.16

9. Start the CccAgent, CccQueue and CccServer Microsoft Windows services.

10.Validate the installation by testing the connectivity to the agent using the 
   CCC Client.

For Microsoft Windows servers where the Server or Web Client component is 
installed apply these additional steps.

1. Follow the instructions described in the Microsoft Security Bulletin MS15-055
   titled "Vulnerability in Schannel Could Allow Information Disclosure 
   (3061518)". 
   (https://technet.microsoft.com/en-us/library/security/ms15-055.aspx)

For IBM Cognos Command Center with above fix applied: Before upgrading your 
installation to 10.2.2 please revert to the original \java\ or \java.6.0.16.0\
directory:

1. Stop the CccServer, CccQueue and CccAgent Windows services.

2. Rename the <INSTALLDIR>\Common\java (or \java.6.0.16.0) directory to 
   <INSTALLDIR>\Common\java.cve (or \java.6.0.16.0.cve)

3. Rename the <INSTALLDIR>\Common\java.orig (or java.6.0.16.0.orig) directory to
   <INSTALLDIR>\Common\java (or java.6.0.16.0).

4. Proceed to upgrade your Cognos Command Center installation to a newer version.

5. After upgrade to newer version is done, please reapply "Vulnerability in 
   Diffie-Hellman ciphers affects IBM Cognos Command Center (CVE-2015-4000)" fix
   starting Step 1.

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 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

26 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.

- ----------------------------------------------------------------------------

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

Document information

More support for:

Cognos Controller

Software version:

8.5, 8.5.1, 10.1, 10.1.1, 10.2.0, 10.2.1

Operating system(s):

Windows

Reference #:

1960454

Modified date:

2015-06-26

Security Bulletin

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key 
exchange protocol affects IBM Cognos Controller

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 Controller 10.2.1

IBM Cognos Controller 10.2

IBM Cognos Controller 10.1.1

IBM Cognos Controller 10.1

IBM Cognos Controller 8.5.1

IBM Cognos Controller 8.5

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.

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

Original version published: June 26, 2015

*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--------------------

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