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)
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)
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)
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)
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)
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
- IBM Cloud Private 3.1.2
- IBM Cloud Private 3.1.1
For IBM Cloud Private 3.1.2, apply patch:
For IBM Cloud Private 3.1.1, apply patch:
For IBM Cloud Private, 2.1.x, 3.1.0:
- Upgrade to the latest Continuous Delivery (CD) update package, IBM Cloud Private 3.2.
- 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
Get Notified about Future Security Bulletins
References
Off
Change History
15 May 2019 - Original version published
*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.
Document Location
Worldwide
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Document Information
Modified date:
15 May 2019
UID
ibm10878460