Security Bulletin
Summary
The SSH "Terrapin" vulnerability affects IBM SAN Volume Controller, IBM Storwize, IBM Storage Virtualize and IBM FlashSystem products when using the chacha20-poly1305@openssh.com cipher. This cipher can be disabled with a chsecurity command to fix the vulnerability.
Vulnerability Details
CVEID: CVE-2023-48795
DESCRIPTION: OpenSSH is vulnerable to a machine-in-the-middle attack, caused by a flaw in the extension negotiation process in the SSH transport protocol when used with certain OpenSSH extensions. A remote attacker could exploit this vulnerability to launch a machine-in-the-middle attack and strip an arbitrary number of messages after the initial key exchange, breaking SSH extension negotiation and downgrading the client connection security.
CVSS Base score: 5.9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/275282 for the current score.
CVSS Vector: (CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM Storage Virtualize | 8.4 |
| IBM Storage Virtualize | 8.5 |
| IBM Storage Virtualize | 8.6 |
| IBM Storage Virtualize | 8.7 |
Remediation/Fixes
IBM recommends that you mitigate this vulnerability by upgrading affected versions of IBM SAN Volume Controller, IBM Storwize V7000, IBM Storwize V5000 and V5100, IBM Storwize V5000E, IBM Storage Virtualize Software, IBM Storage Virtualize for Public Cloud, IBM FlashSystem V9000, IBM FlashSystem 9500, IBM FlashSystem 9100 Family, IBM FlashSystem 9200, IBM FlashSystem 7300, IBM FlashSystem 7200, IBM FlashSystem 5200 and IBM FlashSystem 5000 to the following code levels or higher and then take the actions detailed in "Mitigations and Workrounds" below:
8.4.0.13
8.5.0.12
8.6.0.3
8.6.2.1
8.6.3.0
8.7.0.0
Latest IBM SAN Volume Controller Code
Latest IBM Storwize V7000 Code
Latest IBM Storwize V5000 and V5100 Code
Latest IBM Storwize V5000E Code
Latest IBM FlashSystem 9500 Code
Latest IBM FlashSystem 9100 Family Code
Latest IBM FlashSystem 9200 Code
Latest IBM FlashSystem 7300 Code
Latest IBM FlashSystem 7200 Code
Latest IBM FlashSystem 5000 and 5200 Code
Latest IBM Storage Virtualize for Public Cloud
For the Storage Nodes of IBM FlashSystem 900, please apply the fixes recommended in the IBM FlashSystem security bulletin for this issue.
Workarounds and Mitigations
IBM recommends disabling the chacha20-poly1305@openssh.com cipher by upgrading to one of the versions in "Remediation/Fixes" above and then running the commands below:
- If using 8.6.3.0 or later, run "chsecurity -sshprotocol 4" from the CLI, or navigate to Settings > Security > Security Protocol Levels and choose SSH protocol level 4 in the GUI.
- If using 8.6.2, upgrade to 8.6.2.1 or later, run "chsecurity -sshprotocol 4" from the CLI, or navigate to Settings > Security > Security Protocol Levels and choose SSH protocol level 4 in the GUI .
- If using 8.6.0, upgrade to 8.6.0.3 or later, run "chsecurity -sshprotocol 4" from the CLI, or navigate to Settings > Security > Security Protocol Levels and choose SSH protocol level 4 in the GUI.
- If using 8.5.0, upgrade to 8.5.0.12 or later run "chsecurity -sshprotocol 4" from the CLI.
- If using 8.4.0, upgrade to 8.4.0.13 or later. Then run "chsecurity -sshprotocol 4" from the CLI.
- If using any older code levels (including 7.8.1), upgrade to a supported code level.
Note that SSH security level 4 was not supported by earlier versions of Storage Insights and Spectrum Control.
- For Storage Insights, the fix has been deployed. If you have disabled automatic data collector updates, you should manually update the data collector before enabling SSH security level 4
- For Spectrum Control, ensure you are running version 5.4.12 or later and have updated the data collector before enabling SSH security level 4.
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
29 Jul 2024: Initial Publication
*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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
14 August 2024
UID
ibm17154643