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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0445
        Security Bulletin: Vulnerability in IBM Java Runtime affect
                  Rational Host On-Demand (CVE-2015-7575)
                             23 February 2016

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

Product:           IBM Rational Host On-Demand
Publisher:         IBM
Operating System:  Linux variants
                   Windows
Impact/Access:     Access Privileged Data         -- Remote with User Interaction
                   Provide Misleading Information -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-7575  

Reference:         ASB-2016.0004
                   ESB-2016.0430
                   ESB-2016.0413
                   ESB-2016.0049
                   ESB-2016.0047
                   ESB-2016.0046

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21976527

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Security Bulletin: Vulnerability in IBM Java Runtime affect Rational Host On-
Demand (CVE-2015-7575)

Security Bulletin

Document information

More support for:

Rational Host On-Demand

General Information

Software version:

11.0, 11.0.1.0, 11.0.2.0, 11.0.3.0, 11.0.4.0, 11.0.5.0, 11.0.5.1, 11.0.6,
11.0.6.1, 11.0.7, 11.0.8, 11.0.9, 11.0.10, 11.0.11, 11.0.12, 11.0.13, 11.0.14

Operating system(s):

Linux, Windows

Reference #:

1976527

Modified date:

2016-02-19

Summary

There is a vulnerability in IBM Runtime Environment Java Technology Edition,
Version 1.7SR6 that is used by IBM Rational Host On-Demand This
vulnerability, commonly referred to as SLOTH, was disclosed as part of the
IBM Java SDK updates in January 2016.

Vulnerability Details

CVEID:

CVE-2015-7575

DESCRIPTION:

The TLS protocol could allow weaker than expected security caused by a
collision attack when using the MD5 hash function for signing a
ServerKeyExchange message during a TLS handshake. An attacker could exploit
this vulnerability using man-in-the-middle techniques to impersonate a TLS
server and obtain credentials. This vulnerability is commonly referred to as
SLOTH.

CVSS Base Score: 7.1

CVSS Temporal Score: See

https://exchange.xforce.ibmcloud.com/vulnerabilities/109415

for the current score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/UI:U/C:H/I:L/A:N)

Affected Products and Versions

Host On-Demand 11.0.14 and earlier

Remediation/Fixes

User need to upgrade to 11.0.14 Special Build-2

http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm%7ERational&product=ibm/Rational/IBM+Host
+On-Demand&release=11.0.14.0&platform=All&function=all

Workarounds and Mitigations

Users of Java 7 and later (eg Using Host On Demand 11.0.9  11.0.14) can
address the issue by updating the Server JRE /jre/lib/security/java.security
file as follows (both steps are required):

 Add MD5 to the jdk.certpath.disabledAlgorithms property - e.g.
jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024,MD5

 Add MD5withRSA to the jdk.tls.disabledAlgorithms property - e.g.
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768,MD5withRSA

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References

Complete CVSS v3 Guide


On-line Calculator v3

Related information

IBM Secure Engineering Web Portal


IBM Product Security Incident Response Blog

IBM Java SDK Security Bulletin

Acknowledgement

CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris,
France

Change History

19 Feb 2016 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.

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