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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0518
         IBM Security Bulletin: This Power System update is being
                     released to address CVE-2018-8931
                             20 February 2019

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

Product:           IBM Power System
Publisher:         IBM
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
                   Denial of Service      -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-8931  

Reference:         ESB-2018.3166
                   ESB-2018.2889
                   ESB-2017.1624
                   ESB-2017.1388

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=ibm10869128

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Security Bulletin: This Power System update is being released to address
CVE-2018-8931

Document information

More support for: Power 9 Systems

Software version: OP910

Operating system(s): BMC, Firmware

Reference #: 0869128

Modified date: 18 February 2019



Summary

Power8/Power9: In response to a security bypass vulnerability, a new Power
System firmware update is being released to address Common Vulnerabilities and
Exposures issue number CVE-2018-8931.

The P8 and P9 Processors have a "Self Boot Engine" (SBE) that is used to
initialize the processor before Primary Boot Firmware takes over the IPL. The
SBE's code is stored on two SBE Seeproms per processor. Code running as Host on
a system has access to these SBE Seeproms prior to being write locked by host
firmware and can theoretically corrupt the SBE code stored on them. Changes
were made to negate this possible corruption.

Vulnerability Details

CVEID: CVE-2018-8931
DESCRIPTION: The AMD Ryzen, Ryzen Pro, and Ryzen Mobile processor chips have
insufficient access control for the Secure Processor, aka RYZENFALL-1.
CVSS Base Score: 6.0
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
140293 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H)

The firmware update can be obtained from FixCentral by specifying the Product
and fix level as specified in this Remediation section.


Affected Products and Versions

Firmware releases FW810, FW830, FW840, FW860 are affected - if in OPAL mode.
P9 OpenPOWER release OP910 is affected.


Remediation/Fixes

Customers with the products below, install FW860.60

1) IBM Power System S812(8284-21A)

2) IBM Power System S822(8284-22A)

3) IBM Power System S814(8286-41A)

4) IBM Power System S824(8286-42A)

5) IBM Power System S812L(8247-21L)

6) IBM Power System S822L(8247-22L)

7) IBM Power System S824L(8247-42L)

 

Customers with the products below running OP910, install the OP910.30

1)  IBM Power System AC922 (8335-GTG)

Note:  After updating to the OP910.30 firmware level, it is necessary to do a
manual check to validate that the SBE image is correct.  Follow the steps in
section "7.1 SBE Validation Steps " of the "description" to complete the check
before trying to boot and use the system on the new firmware level.

 *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.


                     Cross reference information
    Product     Component Platform          Version           Edition
Power 8 Systems           Firmware FW810, FW830, FW840, FW860

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