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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0152
         Vulnerability in MD5 Signature and Hash Algorithm affects
                   IBM Sterling Connect:Direct for UNIX
                              21 January 2016

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

Product:           IBM Sterling Connect
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   Linux variants
                   Solaris
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-7575  

Reference:         ASB-2016.0004

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21974888

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Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects
IBM Sterling Connect:Direct for UNIX (CVE-2015-7575)

Security Bulletin

Document information

More support for:

Sterling Connect:Direct for UNIX

Software version:

4.0, 4.1

Operating system(s):

AIX, HP-UX, Linux, Solaris

Reference #:

1974888

Modified date:

2016-01-19

Summary

The MD5 SLOTH vulnerability on TLS 1.2 affects IBM Sterling Connect:Direct
for UNIX.

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.

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/S:U/C:H/I:L/A:N)

Affected Products and Versions

IBM Sterling Connect:Direct for Unix 4.1.0

IBM Sterling Connect:Direct for Unix 4.0.0

Remediation/Fixes

V.R.M.F    APAR     Remediation/First Fix
4.1.0      IT02558  Apply 4.1.0.4 iFix 027 or later, available on Fix Central
4.0.0      IT02558  Apply 4.0.00 Fix 114 or later, available on IWM

For older versions/releases IBM recommends upgrading to a fixed, supported
version/release of the product.

Workarounds and Mitigations

For each record listed in the C:D Secure+ Admin Tool, go to its TLS/SSL
Protocol > TLS/SSL Options tab and remove any cipher suites listed as Enabled
that use MD5 signatures.

You should verify applying this configuration change does not cause any
compatibility issues. Not disabling the MD5 signature hash 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 MD5
signature hash 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 v3 Guide

On-line Calculator v3

Related information

IBM Secure Engineering Web Portal

IBM Product Security Incident Response Blog

Acknowledgement

Reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France

Change History

19 January 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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