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Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects IBM Client Application Access (CVE-2015-7575)

Security Bulletin


The MD5 “SLOTH” vulnerability on TLS 1.2 affects IBM Client Application Access.

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.

Affected Products and Versions

IBM Client Application Access


The IBM Client Application Access (ICAA) SLOTH vulnerability is tracked as SPR KLYHA5YRVP and a fix is introduced in ICAA 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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Related information

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.

Cross reference information
Segment Product Component Platform Version Edition
Messaging Applications IBM Client Application Access

Document information

More support for: IBM Notes

Software version:

Operating system(s): OS X, Windows

Reference #: 1977618

Modified date: 26 February 2016

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