ESB-2019.0623 - [Appliance] IBM SAN Volume Controller: Denial of service - Remote/unauthenticated 2019-02-28

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0623
 IBM Security Bulletin: Vulnerability in the Linux kernel affects IBM SAN
       Volume Controller, IBM Storwize, IBM Spectrum Virtualize and
                 IBM FlashSystem products (CVE-2018-5391)
                             28 February 2019

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

Product:           IBM SAN Volume Controller
Publisher:         IBM
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5391  

Reference:         ESB-2018.3640
                   ESB-2018.3590
                   ESB-2018.3563
                   ESB-2018.3473
                   ESB-2018.3377

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=ibm10872368

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Vulnerability in the Linux kernel affects IBM SAN Volume Controller, IBM
Storwize, IBM Spectrum Virtualize and IBM FlashSystem products (CVE-2018-5391)

Product:             SAN Volume Controller

Operating system(s): Appliance

Reference #:         0872368

Security Bulletin

Summary

A vulnerability in the Linux Kernel affects IBM SAN Volume Controller, IBM
Storwize V7000, V5000, V3700 and V3500, IBM Spectrum Virtualize Software, IBM
Spectrum Virtualize for Public Cloud and IBM FlashSystem V9000 and 9100 family
products.

Vulnerability Details

CVEID: CVE-2018-5391
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by the
improper handling of the reassembly of fragmented IPv4 and IPv6 packets by the
IP implementation. By sending specially crafted IP fragments with random
offsets, a remote attacker could exploit this vulnerability to exhaust all
available CPU resources and cause a denial of service.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
148388 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

IBM SAN Volume Controller
IBM Storwize V7000
IBM Storwize V5000
IBM Storwize V3700
IBM Storwize V3500
IBM FlashSystem V9000
IBM FlashSystem 9100 Family
IBM Spectrum Virtualize Software
IBM Spectrum Virtualize for Public Cloud

All products are affected when running supported version 7.5.

Remediation/Fixes

IBM recommends that you fix this vulnerability by upgrading affected versions
of IBM SAN Volume Controller, IBM Storwize V7000, V5000, V3700 and V3500, IBM
Spectrum Virtualize Software, IBM Spectrum Virtualize for Public Cloud and IBM
FlashSystem V9000 and 9100 family to the following code levels or higher:

7.8.1.8
8.1.3.5
8.2.0.4
8.2.1.2

Latest IBM SAN Volume Controller Code
Latest IBM Storwize V7000 Code
Latest IBM Storwize V5000 Code
Latest IBM Storwize V3700 Code
Latest IBM Storwize V3500 Code
Latest IBM FlashSystem V9000 Code
Latest IBM FlashSystem 9100 Family Code
Latest IBM Spectrum Virtualize Software
Latest IBM Spectrum Virtualize for Public Cloud

For unsupported versions of the above products, IBM recommends upgrading to a
fixed, supported version of code.

Workarounds and Mitigations

Although IBM recommends that you install a level of code with a fix for this
vulnerability, you can mitigate, although not eliminate, your risk until you
have done so by ensuring that all users who have access to the system are
authenticated by another security system such as a firewall.

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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