20 March 2019
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== 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 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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