Security Bulletin
Summary
Red Hat OpenShift on IBM Cloud is affected by a security vulnerability in the Kubernetes controller manager that could leak data to authorized users (CVE-2020-8555)
Vulnerability Details
CVEID: CVE-2020-8555
Description: Kubernetes is vulnerable to server-side request forgery, caused by a flaw in the kube-controller-manager. By using a specially-crafted argument, a remote authenticated attacker could exploit this vulnerability to conduct SSRF attack to leak up to 500 bytes of arbitrary information from unprotected endpoints.
CVSS Base Score: 3.5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/182744 for more information
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N)
Affected Products and Versions
Red Hat OpenShift on IBM Cloud 3.11.0-3.11.231
Remediation/Fixes
Updates for Red Hat OpenShift on IBM Cloud clusters at versions 3.11 or 4.3 are available that fix this vulnerability. Red Hat OpenShift on IBM Cloud service will attempt to automatically apply the fix to your cluster master. There is no need to update cluster worker nodes for this vulnerability.
To verify your clusters are no longer exposed to this vulnerability, 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 this vulnerability:
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 X.Y
with the target version.
ibmcloud oc cluster master update --cluster <cluster name or ID> --version X.Y_openshift
Workarounds and Mitigations
Monitor IBM Cloud Status for Future Security Bulletins
Monitor the security notifications on the IBM Cloud Status page to be advised of future security bulletins.
References
*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.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
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Document Information
Modified date:
21 July 2020
UID
ibm16249891