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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1549
Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Algo
   Credit Limits (CVE-2015-4000) and Security Bulletin: Vulnerability in
       Diffie-Hellman ciphers affects IBM Algo Credit Administrator
                              (CVE-2015-4000)
                               15 June 2015

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

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

Product:           IBM Algo Credit Limits
                   IBM Algo Credit Administrator
Publisher:         IBM
Operating System:  AIX
                   Linux variants
                   Solaris
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-4000  

Reference:         ESB-2015.1540
                   ESB-2015.1536
                   ESB-2015.1535
                   ESB-2015.1534
                   ESB-2015.1522
                   ESB-2015.1544.2

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21959625
   http://www-01.ibm.com/support/docview.wss?uid=swg21959658

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

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

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Algo 
Credit Limits (CVE-2015-4000)

Document information

More support for:

Algo Credit Limits

Software version:

4.7.0

Operating system(s):

AIX, Linux, Solaris

Reference #:

1959625

Modified date:

2015-06-12

Security Bulletin

Summary

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

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

Algo Credit Limits 4.7 and earlier

Remediation/Fixes

None

Workarounds and Mitigations

To disable the DHE stream cipher in your Algo Credit Limits server 
installation, edit 
$ACLM_HOME/jlib/platform/jre/jre/lib/security/java.security. Find the line 
jdk.tls.disabledAlgorithms=SSLv3 and change it to 
jdk.tls.disabledAlgorithms=SSLv3, RC4, DHE

If you use the Tomcat included in your Algo Credit Limits installation to 
provide access to your environment, you need to make sure to substitute the 
self-signed certificate in the Tomcat keystore in 
$ACLM_HOME/jlib/etc/system/cfg/jlib.jks with a valid certificate for this 
server. The certificate's signature algorithm must be SHA1withRSA and the key
algorithm must be RSA.

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

10 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 Algo 
Credit Administrator (CVE-2015-4000)

Document information

More support for:

Algo Credit Administrator

Software version:

2.1.1, 2.1.2, 2.2.0

Operating system(s):

AIX, Linux, Solaris

Reference #:

1959658

Modified date:

2015-06-12

Security Bulletin

Summary

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

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

Algo Credit Administrator 2.2.0 and earlier

Remediation/Fixes

None

Workarounds and Mitigations

To disable the DHE stream cipher in your Algo Credit Administrator server 
installation, edit $ACA_HOME/jlib/platform/jre/jre/lib/security/java.security.
Find the line jdk.tls.disabledAlgorithms=SSLv3 and change it to 
jdk.tls.disabledAlgorithms=SSLv3, RC4, DHE

If you use the Tomcat included in your Algo Credit Administrator installation
to provide access to your environment, you need to make sure to substitute the
self-signed certificate in the Tomcat keystore in 
$ACA_HOME/jlib/etc/system/cfg/jlib.jks with a valid certificate for this 
server. The certificate's signature algorithm must be SHA1withRSA and the key
algorithm must be RSA.

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

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

10 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--------------------

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