Security Bulletin: Due to the use of IBM WebSphere Liberty, IBM TXSeries for Multiplatforms is vulnerable to a flaw in handling multiplexed streams in the HTTP/2 protocol (CVE-2023-44487).

Summary

IBM WebSphere Liberty is used by IBM TXSeries for Multiplatforms to provide a web based administration console (CVE-2023-44487).

Vulnerability Details

CVEID:CVE-2023-44487
**DESCRIPTION:**Multiple vendors are vulnerable to a denial of service, caused by a flaw in handling multiplexed streams in the HTTP/2 protocol. By sending numerous HTTP/2 requests and RST_STREAM frames over multiple streams, a remote attacker could exploit this vulnerability to cause a denial of service due to server resource consumption.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/268044 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 strongly recommends addressing the vulnerability now by upgrading IBM CICS TXSeries for Multiplatforms.

PSIRT fixes for TXSeries 8.1 will be provided only for extended support customers with a request through Salesforce case

IBM TXSeries for Multiplatforms| 8.2| Linux, Windows, AIX| Download the upgrade from Fix Central
IBM TXSeries for Multiplatforms| 9.1| Linux, AIX| Download the upgrade from Fix Central

Workarounds and Mitigations

None