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AUSCERT External Security Bulletin Redistribution
ESB-2019.0899
IBM Security Bulletin: This Power System update is being
released to address CVE-2018-5391
20 March 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Power 9 Systems
Publisher: IBM
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-5391
Reference: ESB-2019.0892
ESB-2019.0854
ESB-2019.0726
ESB-2019.0675
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=ibm10873156
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This Power System update is being released to address CVE-2018-5391
Product: Power 9 Systems
Software version: FW920
Operating system(s): Firmware
Reference #: 0873156
Security Bulletin
Summary
Power9: In response to a denial of service vulnerability, a new Power Systems
firmware update is being released to address Common Vulnerabilities and
Exposures issue number CVE-2018-5391.
A remote attacker could use large IP frames to trigger time and calculation
expensive calls in the reassembly of the packets. This could could lead to CPU
saturation and possible reset and termination of the service processor. Changes
were made to lower the IP fragment threshold values to prevent the attack.
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
Firmware release FW920 is affected.
Remediation/Fixes
Customers with the products below, install FW920.30
1) IBM Power Systems E950(9040-MR9)
2) IBM Power Systems E980(9080-M9S)
Workarounds and Mitigations
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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