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Security Bulletin: Red Hat OpenShift on IBM Cloud is affected by Kubernetes API server security vulnerabilities (CVE-2023-39325 and CVE-2023-44487)

Security Bulletin


Red Hat OpenShift on IBM Cloud is affected by security vulnerabilities in the Kubernetes API server that may allow a denial of service attack from unauthenticated clients (CVE-2023-39325 and CVE-2023-44487).

Vulnerability Details

CVEID: CVE-2023-39325

Description: A malicious HTTP/2 client which rapidly creates requests and immediately resets them can cause excessive server resource consumption. While the total number of requests is bounded by the http2.Server.MaxConcurrentStreams setting, resetting an in-progress request allows the attacker to create a new request while the existing one is still executing. With the fix applied, HTTP/2 servers now bound the number of simultaneously executing handler goroutines to the stream concurrency limit (MaxConcurrentStreams). New requests arriving when at the limit (which can only happen after the client has reset an existing, in-flight request) will be queued until a handler exits. If the request queue grows too large, the server will terminate the connection. This issue is also fixed in for users manually configuring HTTP/2. The default stream concurrency limit is 250 streams (requests) per HTTP/2 connection. This value may be adjusted using the package; see the Server.MaxConcurrentStreams setting and the ConfigureServer function.
CVSS Base Score: 7.5
CVSS Temporal Score: for more information
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2023-44487
Description: The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
CVSS Base Score: 7.5
CVSS Temporal Score: for more information
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

Red Hat OpenShift on IBM Cloud 4.13.0-4.13.18
Red Hat OpenShift on IBM Cloud 4.12.0-4.12.39
Red Hat OpenShift on IBM Cloud 4.11.0-4.11.51
Red Hat OpenShift on IBM Cloud 3.11-4.10


Updates for Red Hat OpenShift on IBM Cloud clusters at version 4.11 or later are available that fix these vulnerabilities. Red Hat OpenShift on IBM Cloud will attempt to automatically apply the fix to your cluster master. There is no need to update cluster worker nodes for these vulnerabilities.

To verify your clusters are no longer exposed to these vulnerabilities, use the following IBM Cloud CLI command to confirm your cluster master versions:

ibmcloud oc clusters

If your cluster masters are at one of the following versions or later, they are no longer exposed to these vulnerabilities:


If one or more of your clusters has not had its master automatically updated then use the following IBM Cloud CLI command to complete the cluster master update, replacing 4.##_openshift with the target version.

ibmcloud oc cluster master update --cluster <cluster name or ID> --version 4.##_openshift

Customers running Red Hat OpenShift on IBM Cloud clusters at version 4.9 and 4.10 must upgrade to version 4.11. Please review the documentation before starting an upgrade since additional actions may be required.

Customers running Red Hat OpenShift on IBM Cloud clusters at version 4.8 or earlier must create a new cluster and deploy their apps to the new cluster.

Red Hat OpenShift on IBM Cloud versions 4.9 and earlier are no longer supported and version 4.10 is deprecated with end of support tentatively scheduled for 31 January 2024. See the Red Hat OpenShift on IBM Cloud version information and update actions documentation for more information about OpenShift versions and version support policies.

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*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location


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Product Synonym


Document Information

Modified date:
28 November 2023