ESB-2019.0834 - [Appliance] Power 9 Systems: Root compromise - Existing account 2019-03-14

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0834
         IBM Security Bulletin: This Power System update is being
                     released to address CVE 2019-6260
                               14 March 2019

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

Product:           Power 9 Systems
Publisher:         IBM
Operating System:  Network Appliance
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6260  

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=ibm10869130

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This Power System update is being released to address CVE 2019-6260

Product:             Power 9 Systems

Software version:    OP910, OP920

Operating system(s): BMC, Firmware

Reference #:         0869130

Security Bulletin

Summary

Power9: In response to an arbitrary access to the BMC's physical address space
from the host, a new Power System firmware update is being released to address
Common Vulnerabilities and Exposures issue number CVE 2019-6260.
IBM engineers discovered that configuration of the Baseboard Management
Controller (BMC) hardware features potentially left it open to unauthenticated
compromise from the host and from the BMC console. It could allow the host full
access to BMC memory and flash, violating the principle of BMC and host being
in separate trust domains.

Vulnerability Details

CVEID: CVE 2019-6260

DESCRIPTION: The ASPEED AST2400 and AST2500 Baseboard Management Controller
(BMC) hardware and firmware implement Advanced High-performance Bus (AHB)
bridges, which allow arbitrary read and write access to the BMC's physical
address space from the host (or from the network in unusual cases where the BMC
console uart is attached to a serial concentrator). This CVE applies to the
specific cases of iLPC2AHB bridge Pt I, iLPC2AHB bridge Pt II, PCIe VGA P2A
bridge, DMA from/to arbitrary BMC memory via X-DMA, UART-based SoC Debug
interface, LPC2AHB bridge, PCIe BMC P2A bridge, and Watchdog setup.

CVSS Base Score: 6.7

CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
155952 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

P9 OpenPOWER releases OP910 and OP920 are affected.

Remediation/Fixes

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

1) Power System AC922 (8335-GTG)

Customers with the products below running OP920, install the OP920.10

1) IBM Power System AC922 (8335-GTH)

2) IBM Power System AC922 (8335-GTX)

3) IBM Power System LC921 (9006-12P)

4) IBM Power System LC922 (9006-22P)

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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