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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3852
          IBM MQ Appliance is affected by kernel vulnerabilities
            (CVE-2019-11479, CVE-2019-11478 and CVE-2019-11477)
                              16 October 2019

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

Product:           IBM MQ Appliance
Publisher:         IBM
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-11479 CVE-2019-11478 CVE-2019-11477

Reference:         ASB-2019.0178.2
                   ESB-2019.3835
                   ESB-2019.2182
                   ESB-2019.2132.3

Original Bulletin: 
   https://www.ibm.com/support/pages/node/1073340

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IBM MQ Appliance is affected by kernel vulnerabilities (CVE-2019-11479,
CVE-2019-11478 and CVE-2019-11477)

Security Bulletin

Summary

IBM MQ Appliance has addressed the following kernel vulnerabilities.

Vulnerability Details

CVEID: CVE-2019-11479
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
flaw when processing minimum segment size (MSS). By sending specially-crafted
MSS traffic, a remote attacker could exploit this vulnerability to cause excess
usage of system resources.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
162665 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)

CVEID: CVE-2019-11478
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an
issue with fragmenting the TCP retransmission queue when processing TCP
Selective Acknowledgement (SACK) capabilities. By sending specially-crafted
SACKs requests, a remote attacker could exploit this vulnerability to cause an
excess of system resource usage.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
162664 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)

CVEID: CVE-2019-11477
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an
integer overflow when processing TCP Selective Acknowledgement (SACK)
capabilities. By sending specially-crafted SACKs requests, a remote attacker
could exploit this vulnerability to cause a kernel panic condition.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
162662 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

IBM MQ Appliance 9.1 Long Term Support (LTS) Release
Maintenance levels between 9.1.0.0 and 9.1.0.3

IBM MQ Appliance 9.1.x Continuous Delivery (CD) Release
Continuous delivery updates 9.1.1 and 9.1.3

Remediation/Fixes

IBM MQ Appliance version 9.1 LTS
Apply ifix IT30490 ,or later maintenance.
IBM MQ Appliance version 9.1 CD
Apply ifix IT30490 , or later maintenance.

Workarounds and Mitigations

None.

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