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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in MD5 Signature and Hash
Algorithm affects IBM Domino (CVE-2015-7575)
1 February 2016
AusCERT Security Bulletin Summary
Product: IBM Domino
Operating System: AIX
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 Domino (CVE-2015-7575)
More support for:
22.214.171.124, 126.96.36.199, 188.8.131.52
AIX, Linux, Windows
The MD5 "SLOTH" vulnerability on TLS 1.2 affects IBM Domino.
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 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.
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 -
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
Get Notified about Future Security Bulletins
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alerts like this.
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
*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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