Security Bulletin: IBM Cloud Pak for Multicloud Management Monitoring is vulnerable to several attack vectors due to its use of Apache Netty (CVE-2021-37136, CVE-2021-37137, CVE-2021-43797)

Summary

Several security vulnerablities were found in the Apache Netty library used by several components in IBM Cloud Pak for Multicloud Management Monitoring.

Vulnerability Details

CVEID:CVE-2021-37136
**DESCRIPTION:**Netty netty-codec is vulnerable to a denial of service, caused by not allow size restrictions for decompressed data in the Bzip2Decoder. By sending a specially-crafted input, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/211777 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-2021-37137
**DESCRIPTION:**Netty netty-codec is vulnerable to a denial of service, caused by not restrict the chunk length in the SnappyFrameDecoder. By sending a specially-crafted input, a remote attacker could exploit this vulnerability to cause excessive memory usage, and results in a denial of service condition.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/211779 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-2021-43797
**DESCRIPTION:**Netty is vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header names. By sending a specially-crafted HTTP(S) transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215118 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)

Affected Products and Versions

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now by upgrading using the instructions found at <https://www.ibm.com/docs/en/cloud-paks/cp-management/2.3.x?topic=installation-upgrade.&gt;

Workarounds and Mitigations

None