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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0252
        Security Bulletin: Vulnerability in MD5 Signature and Hash
               Algorithm affects IBM Domino (CVE-2015-7575)
                              1 February 2016

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

Product:           IBM Domino
Publisher:         IBM
Operating System:  AIX
                   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-2016.0226
                   ESB-2016.0221
                   ESB-2016.0219
                   ESB-2016.0197
                   ESB-2016.0196
                   ESB-2016.0190

Original Bulletin: 
   http://www-01.ibm.com/support/docview.wss?uid=swg21974958

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

Document information

More support for:

IBM Domino

Security

Software version:

9.0.1.3, 9.0.1.4, 9.0.1.5

Operating system(s):

AIX, Linux, Windows

Reference #:

1974958

Modified date:

2016-01-28

Security Bulletin

Summary

The MD5 "SLOTH" vulnerability on TLS 1.2 affects IBM Domino.

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 Domino 9.0.1 Fix Pack 3 Interim Fix 2 through 9.0.1 Fix Pack 5.

NOTE: Since this vulnerability involves TLS 1.2, neither IBM Domino 9.0 nor 
IBM Domino 8.5.x are affected.

Remediation/Fixes

The Domino SLOTH vulnerability is tracked as SPR KLYHA5YRVP and a fix is 
introduced in Domino 9.0.1 Fix Pack 5 Interim Fix 1.

For Fix download links, refer to the following technote:

   Notes & Domino 9.0.1 Fix Packs and Interim Fixes - 
   http://www.ibm.com/support/docview.wss?uid=swg21657963

Customers who remain on the following releases may open a Service Request with
IBM Support and reference SPR KLYHA5YRVP for a custom hotfix:

   IBM Domino 9.0.1 Fix Pack 4 and all Interim Fixes

   IBM Domino 9.0.1 Fix Pack 3 IF3 and later

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.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support 
alerts like this.

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

*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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