Security Bulletin
Summary
The MD5 “SLOTH” vulnerability on TLS 1.2 affects IBM Sterling Connect:Direct for UNIX.
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 Sterling Connect:Direct for Unix 4.1.0
IBM Sterling Connect:Direct for Unix 4.0.0
Remediation/Fixes
|
V.R.M.F | APAR | Remediation/First Fix |
| 4.1.0 | IT02558 | Apply 4.1.0.4 iFix 027 or later, available on Fix Central |
| 4.0.0 | IT02558 | Apply 4.0.00 Fix 114 or later, available on IWM |
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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Important Note
IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. 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.
References
Acknowledgement
Reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France
Change History
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.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
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Document Information
Modified date:
24 July 2020
UID
swg21974888