Date: 29 February 2016
References: ASB-2016.0004 ESB-2016.0495 ESB-2016.0497 ESB-2016.0498 ESB-2016.0499 ESB-2016.0507 ESB-2016.0508 ESB-2016.0509 ESB-2016.0519 ESB-2016.0521
ESB-2016.0522 ESB-2016.0523 ESB-2016.0525 ESB-2016.0538 ESB-2016.0539 ESB-2016.0542 ESB-2016.0550
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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm
affects IBM Client Application Access (CVE-2015-7575)
29 February 2016
AusCERT Security Bulletin Summary
Product: IBM Client Application Access
Operating System: OS X
Impact/Access: Access Privileged Data -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
CVE Names: CVE-2015-7575
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Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects
IBM Client Application Access (CVE-2015-7575)
More support for:
OS X, Windows
The MD5 SLOTH vulnerability on TLS 1.2 affects IBM Client Application Access.
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
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 Client Application Access 126.96.36.199
The IBM Client Application Access (ICAA) SLOTH vulnerability is tracked as SPR
KLYHA5YRVP and a fix is introduced in ICAA 188.8.131.52 Interim Fix 1. You can
download the Interim Fix from the ICAA tab of the following technote:
Note: You should verify applying this fix does not cause any compatibility
issues. The fix disables MD5 signature hash by default. 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 MD5 signature hash and take
appropriate mitigation and remediation actions.
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Complete CVSS v3 Guide
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IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Note: This technote applies only to IBM Client Application Access.
Reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France
*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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