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AUSCERT External Security Bulletin Redistribution
ESB-2019.1766
Multiple Security Vulnerabilities affect IBM Cloud Private Kubernetes
17 May 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Cloud Private
Publisher: IBM
Operating System: Linux variants
Impact/Access: Modify Arbitrary Files -- Remote with User Interaction
Denial of Service -- Existing Account
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1002101 CVE-2019-1002100 CVE-2019-11243
CVE-2019-9946 CVE-2019-4119
Reference: ESB-2019.1260
ESB-2019.1173
ESB-2019.0735
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=ibm10878460
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Multiple Security Vulnerabilities affect IBM Cloud Private Kubernetes
Product: IBM Cloud Private
Software version: All Versions
Operating system(s): Linux
Reference #: 0878460
Security Bulletin
Summary
Multiple Security Vulnerabilities affect IBM Cloud Private Kubernetes
Vulnerability Details
CVEID: CVE-2019-4119
DESCRIPTION: IBM Cloud Private Kubernetes API server can be used as an HTTP
proxy to not only cluster internal but also external target IP addresses.
CVSS Base Score: 3.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
158145 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2019-9946
DESCRIPTION: Kubernetes could provide weaker than expected security, caused by
an interaction when paired with the embedded CNI (Container Networking
Interface) that uses the portmap plugin. The portmap plugin inserts rules at
the front of the iptables nat chains which would take precedence over the KUBE-
SERVICES chain. The HostPort/portmap rule allows for matching of incoming
traffic even if there are better fitting.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
158803 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2019-1002100
DESCRIPTION: The Kubernetes API server is vulnerable to a denial of service. By
sending a specially crafted patch of type "json-patch" requests, a remote
authenticated attacker could exploit this vulnerability to consume an excessive
amount of resources.
CVSS Base Score: 6.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
157685 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CVEID: CVE-2019-1002101
DESCRIPTION: Kubernetes could allow a remote attacker to traverse directories
on the system, caused by the improper handling of symlinks. By persuading a
victim to use the kubectl cp command or the oc cp command with a malicious
container, an attacker could replace or delete arbitrary files on the host
machine.
CVSS Base Score: 6.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
158804 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
CVEID: CVE-2019-11243
DESCRIPTION: Kubernetes could allow a remote attacker to bypass security
restrictions, caused by the failure to effectively clear service account
credentials loaded using rest.InClusterConfig() by the
rest.AnonymousClientConfig() method. By sending a specially-crafted request, an
attacker could exploit this vulnerability to send the loaded service account
token with requests.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
160040 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
Affected Products and Versions
IBM Cloud Private 2.1.x, 3.1.0, 3.1.1, 3.1.2
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 3.1.2
o IBM Cloud Private 3.1.1
For IBM Cloud Private 3.1.2, apply patch:
o Kubernetes
For IBM Cloud Private 3.1.1, apply patch:
o Kubernetes
For IBM Cloud Private, 2.1.x, 3.1.0:
o Upgrade to the latest Continuous Delivery (CD) update package, IBM Cloud
Private 3.2.
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
Change History
15 May 2019 - Original version published
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