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AUSCERT External Security Bulletin Redistribution
Power System update addresses CVE-2019-4169
23 August 2019
AusCERT Security Bulletin Summary
Product: IBM Power 9 Systems
Operating System: Network Appliance
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2019-4169
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This Power System update is being released to address CVE-2019-4169
Product: Power 9 Systems
Software version: OP910, OP920
Operating system(s): BMC, Firmware
Reference #: 0881209
POWER9: In response to an IPMI implementation error, a new Power System
firmware update is being released to address Common Vulnerabilities and
Exposures issue number CVE 2019-4169.
DESCRIPTION: IBM Open Power Firmware could allow access to BMC via IPMI using
default OpenBMC password even after BMC password was changed away from the
CVSS Base Score: 8.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
158702 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
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
P9 OpenPOWER releases OP910 and OP920 are affected.
Customers with the products below running OP920, install the OP920.20
1) IBM Power System AC922 (8335-GTH)
2) IBM Power System AC922 (8335-GTX)
Customers with the products below running OP910, install the OP910.31
1) IBM Power System AC922 (8335-GTC)
2) IBM Power System AC922 (8335-GTG)
3) IBM Power System AC922 (8335-GTW)
Workarounds and Mitigations
Disabling IPMI local area network (LAN) access via IPMI inband commands will
mitigate the vulnerability until the fix can be applied.
Run the following IPMI inband command to disable IPMI LAN access: "ipmitool lan
set 1 access off".
Run the following IPMI inband command to reenable IPMI LAN access: "ipmitool
lan set 1 access on".
The vulnerability was reported to IBM by Thilo Maurer.
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