Security Bulletin: IBM MQ is vulnerable to multiple Jetty vulnerabilities (CVE-2021-34428, CVE-2021-34429, CVE-2021-28169)

Summary

Multiple issues were identified in Eclipse Jetty that IBM MQ Explorer uses and is affected by.

Vulnerability Details

CVEID:CVE-2021-34428
**DESCRIPTION:**Eclipse Jetty could allow a physical attacker to bypass security restrictions, caused by a session ID is not invalidated flaw when an exception is thrown from the SessionListener#sessionDestroyed() method. By gaining access to the application on the shared computer, an attacker could exploit this vulnerability to bypass access restrictions.
CVSS Base score: 3.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/204227 for the current score.
CVSS Vector: (CVSS:3.0/AV:P/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)

CVEID:CVE-2021-34429
**DESCRIPTION:**Eclipse Jetty could allow a remote attacker to obtain sensitive information, caused by improper access control. By sending a specially-crafted URI, an attacker could exploit this vulnerability to obtain the content of the WEB-INF directory, and use this information to launch further attacks against the affected system.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/205596 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

CVEID:CVE-2021-28169
**DESCRIPTION:**Eclipse Jetty could allow a remote attacker to obtain sensitive information, caused by a flaw in the ConcatServlet. By sending a specially-crafted request using a doubly encoded path, an attacker could exploit this vulnerability to obtain sensitive information from protected resources within the WEB-INF directory, and use this information to launch further attacks against the affected system.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/203492 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

Affected Products and Versions

Remediation/Fixes

IBM MQ 9.0 LTS

This issue has been resolved under APAR IT36791

Apply FixPack 9.0.0.12

IBM MQ 9.1 LTS

This issue has been resolved under APAR IT38605

Apply FixPack 9.1.0.10

IBM MQ 9.2 LTS

This issue has been resolved under APAR IT38604

Apply FixPack 9.2.0.4

IBM MQ 9.1 CD and 9.2 CD

This issue has been resolved under APAR IT29154

Upgrade to IBM MQ 9.2.4

Workarounds and Mitigations

None