ESB-2019.0337 - [Linux] IBM Elastic Storage Server: Provide misleading information - Existing account 2019-02-06

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0337
IBM Spectrum Scale for IBM Elastic Storage Server is affected by the use of
 Local Read Only Cache (LROC) which may result in directory corruption and
               undetected data corruption in regular files.
                              6 February 2019

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

Product:           IBM Elastic Storage Server
Publisher:         IBM
Operating System:  Linux variants
Impact/Access:     Provide Misleading Information -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1993  

Original Bulletin: 
   https://www.ibm.com/support/docview.wss?uid=ibm10794443

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IBM Spectrum Scale for IBM Elastic Storage Server is affected by the use of
Local Read Only Cache (LROC) which may result in directory corruption and
undetected data corruption in regular files.

Product:             IBM Elastic Storage Server
Software version:    All Versions
Operating system(s): Linux
Reference #:         0794443
Security Bulletin


Summary

The Elastic Storage Server is affected by a vulnerability in IBM Spectrum Scale
where after cached data is moved from memory to the LROC device, any changes to
that data should trigger invalidation of the data stored in LROC. Due to a
problem with invalidation logic, it is possible for the invalidation of this
LROC data to be skipped. This could lead to stale or incorrect data being
recalled from LROC, with potential for the corruption of files and directories

Vulnerability Details

CVEID: CVE-2018-1993
DESCRIPTION: IBM Spectrum Scale (GPFS) where the use of Local Read Only Cache
(LROC) is enabled may caused read operation on a file to return data from a
different file.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/154440
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)


Affected Products and Versions

The Elastic Storage Server 5.3 thru 5.3.1.1
The Elastic Storage Server 5.0.0 thru 5.2.4
The Elastic Storage Server 4.5.0 thru 4.6.0
The Elastic Storage Server 4.0.0 thru 4.0.6


Remediation/Fixes

For IBM Elastic Storage Server V5.0.0. thru 5.3.1.1, apply V5.3.2.0 available
from FixCentral at:

https://www-945.ibm.com/support/fixcentral/swg/selectFixesparent=
Software%20defined%20storage&product=ibm/StorageSoftware/
IBM+Elastic+Storage+Server+(ESS)&release=5.3.0&platform=All&function=all

For IBM Elastic Storage Server V5.0.0. thru 5.2.4.0, apply V5.2.5 available
from FixCentral at:

https://www-945.ibm.com/support/fixcentral/swg/selectFixesparent=
Software%20defined%20storage&product=ibm/StorageSoftware/
IBM+Elastic+Storage+Server+(ESS)&release=5.2.0&platform=All&function=all

If you are unable to upgrade to ESS 5.3.2.0 or 5.2.5, please contact IBM
Service to obtain an efix:

- - For IBM Elastic Storage Server 5.3-5.3.1.1, reference APAR IJ10565
- - For IBM Elastic Storage Server 5.0 - 5.2.4.0, reference APAR IJ10573
- - For IBM Elastic Storage Server 4.0.0 - 4.6.0, reference APAR IJ11409

To contact IBM Service, see http://www.ibm.com/planetwide/


Workarounds and Mitigations

Work-around : Although IBM recommends that you install a level of IBM Elastic
Storage Server code with a fix, you can avoid this vulnerability by not
enabling Local Read Only (LROC) feature in IBM Spectrum Scale.


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Reference

Complete CVSS v3 Guide
On-line Calculator v3

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

*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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