Security Bulletin: IBM MQ Appliance affected by HTTP/2 vulnerabilities (CVE-2019-9511 and CVE-2019-9513)

Summary

IBM MQ Appliance has addressed the following HTTP/2 vulnerabilities.

Vulnerability Details

CVEID:CVE-2019-9513
**DESCRIPTION:**Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/164639 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID:CVE-2019-9511
**DESCRIPTION:**Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/164638 for the current score.
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

Remediation/Fixes

IBM MQ Appliance 8
Apply fix pack 8.0.0.14, or later.

IBM MQ Appliance version 9.1 LTS

Apply fix pack 9.1.0.4, or later.

IBM MQ Appliance version 9.1 CD

Apply continuous delivery release 9.1.4, or later.

Workarounds and Mitigations

None