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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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