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AUSCERT External Security Bulletin Redistribution
Vulnerability in MD5 Signature and Hash Algorithm affects
IBM Sterling Connect:Direct for UNIX
21 January 2016
AusCERT Security Bulletin Summary
Product: IBM Sterling Connect
Operating System: AIX
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2015-7575
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Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects
IBM Sterling Connect:Direct for UNIX (CVE-2015-7575)
More support for:
Sterling Connect:Direct for UNIX
AIX, HP-UX, Linux, Solaris
The MD5 SLOTH vulnerability on TLS 1.2 affects IBM Sterling Connect:Direct
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
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
V.R.M.F APAR Remediation/First Fix
4.1.0 IT02558 Apply 188.8.131.52 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.
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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.
Complete CVSS v3 Guide
On-line Calculator v3
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France
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.
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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