Security Bulletin: IBM Cloud Private is vulnerable to Kubernetes vulnerabilities (CVE-2020-8557, CVE-2020-8559)

Summary

IBM Cloud Private is vulnerable to Kubernetes vulnerabilities

Vulnerability Details

CVEID:CVE-2020-8557
**DESCRIPTION:**Kubernetes kubelet is vulnerable to a denial of service, caused by an issue with not including the /etc/hostsfile file by the kubelet eviction manager when calculating ephemeral storage usage. By writing a large amount of data to the /etc/hostsfile, a local authenticated attacker could exploit this vulnerability to fill the storage space of the node and cause the node to fail.
CVSS Base score: 5.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/185301 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

CVEID:CVE-2020-8559
**DESCRIPTION:**Kubernetes kube-apiserver could allow a remote authenticated attacker to gain elevated privileges on the system, caused by a flaw when multiple clusters share the same certificate authority trusted by the client. By intercepting certain requests and sending a redirect response, an attacker could exploit this vulnerability to compromise other nodes.
CVSS Base score: 6.4
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/185302 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H)

Affected Products and Versions

Remediation/Fixes

Product defect fixes and security updates are only available for the two most recent Continuous Delivery (CD) update packages

• IBM Cloud Private 3.2.1
• IBM Cloud Private 3.2.2

For IBM Cloud Private 3.2.1, the defect fixes for Kubernetes require an update to the Kubernetes version. The ICP 3.2.2 fixpack updates Kubernetes from version 1.13.12 to 1.16.13 and includes defect fixes. The procedure is to first upgrade an ICP 3.2.1 deployment to ICP 3.2.1.2003 or newer. Then, you can apply the 3.2.2.2008 fix pack.

• IBM Cloud Private 3.2.1.2008
• IBM Cloud Private 3.2.2.2008

For IBM Cloud Private 3.2.2, apply Aug fix pack:

• IBM Cloud Private 3.2.2.2008

For IBM Cloud Private 3.1.0, 3.1.1, 3.1.2, 3.2.0:

• Upgrade to the latest Continuous Delivery (CD) update package, IBM Cloud Private 3.2.2.2008.
• If required, individual product fixes can be made available between CD update packages for resolution of problems. Contact IBM support for assistance

Workarounds and Mitigations

None