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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3343 Security Bulletin: IBM Cloud Private - multiple Kubernetes vulnerabilities (CVE-2020-8557, CVE-2020-8559) 29 September 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Cloud Private Publisher: IBM Operating System: Linux variants Impact/Access: Increased Privileges -- Existing Account Overwrite Arbitrary Files -- Existing Account Denial of Service -- Existing Account Provide Misleading Information -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-8559 CVE-2020-8557 CVE-2020-8553 Reference: ESB-2020.3256 ESB-2020.2997 ESB-2020.2897 Original Bulletin: https://www.ibm.com/support/pages/node/6338779 https://www.ibm.com/support/pages/node/6338783 Comment: This bulletin contains two (2) IBM security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- IBM Cloud Private is vulnerable to Kubernetes vulnerabilities (CVE-2020-8557, CVE-2020-8559) Security Bulletin 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 +--------------------+----------+ |Affected Product(s) |Version(s)| +--------------------+----------+ |IBM Cloud Private |3.2.1 CD | +--------------------+----------+ |IBM Cloud Private |3.2.2 CD | +--------------------+----------+ Remediation/Fixes Product defect fixes and security updates are only available for the two most recent Continuous Delivery (CD) update packages o IBM Cloud Private 3.2.1 o 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. o IBM Cloud Private 3.2.1.2008 o IBM Cloud Private 3.2.2.2008 For IBM Cloud Private 3.2.2, apply Aug fix pack: o IBM Cloud Private 3.2.2.2008 For IBM Cloud Private 3.1.0, 3.1.1, 3.1.2, 3.2.0: o Upgrade to the latest Continuous Delivery (CD) update package, IBM Cloud Private 3.2.2.2008. o 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 - ----------------------------------------------------------------------------- IBM Cloud Private is vulnerable to a Kubernetes vulnerability (CVE-2020-8553) Security Bulletin Summary IBM Cloud Private is vulnerable to a Kubernetes vulnerability Vulnerability Details CVEID: CVE-2020-8553 DESCRIPTION: Kubernetes ingress-nginx could allow a remote authenticated attacker to bypass security restrictions, caused by a flaw when the annotation nginx.ingress.kubernetes.io/auth-type: basic is used. By sending a specially-crafted request, an attacker could exploit this vulnerability to create a new Ingress definition and replace the password file. CVSS Base score: 5.9 CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/ 186050 for the current score. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N) Affected Products and Versions +--------------------+----------+ |Affected Product(s) |Version(s)| +--------------------+----------+ |IBM Cloud Private |3.2.1 CD | +--------------------+----------+ |IBM Cloud Private |3.2.2 CD | +--------------------+----------+ Remediation/Fixes Product defect fixes and security updates are only available for the two most recent Continuous Delivery (CD) update packages o IBM Cloud Private 3.2.1 o IBM Cloud Private 3.2.2 For IBM Cloud Private 3.2.1, apply Aug fix pack: o IBM Cloud Private 3.2.1.2008 For IBM Cloud Private 3.2.2, apply Aug fix pack: o IBM Cloud Private 3.2.2.2008 For IBM Cloud Private 3.1.0, 3.1.1, 3.1.2, 3.2.0: o Upgrade to the latest Continuous Delivery (CD) update package, IBM Cloud Private 3.2.2.2008. o 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 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. 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