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AUSCERT External Security Bulletin Redistribution
IBM Security Bulletin: This Power System update is being
released to address CVE-2018-8931
20 February 2019
AusCERT Security Bulletin Summary
Product: IBM Power System
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-8931
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Security Bulletin: This Power System update is being released to address
More support for: Power 9 Systems
Software version: OP910
Operating system(s): BMC, Firmware
Reference #: 0869128
Modified date: 18 February 2019
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.
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.
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.
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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