Kubernetes up to 1.9.3 denial of service

Summaryinfo

A vulnerability categorized as problematic has been discovered in Kubernetes up to 1.9.3. Impacted is an unknown function. Such manipulation leads to denial of service. This vulnerability is documented as CVE-2017-1002102. The attack needs to be performed locally. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Kubernetes up to 1.9.3 (Virtualization Software). It has been rated as problematic. Affected by this issue is an unknown functionality. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

In Kubernetes versions 1.3.x, 1.4.x, 1.5.x, 1.6.x and prior to versions 1.7.14, 1.8.9 and 1.9.4 containers using a secret, configMap, projected or downwardAPI volume can trigger deletion of arbitrary files/directories from the nodes where they are running.

The bug was discovered 03/06/2018. The weakness was released 03/13/2018 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is handled as CVE-2017-1002102 since 12/07/2017. The attack needs to be approached locally. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108939 (Oracle Linux 7 : kubernetes (ELSA-2018-4061)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370860 (Kubernetes Multiple Security Vulnerabilities).

Upgrading to version 1.7.14, 1.8.9 or 1.9.4 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (108939). Entry connected to this vulnerability is available at VDB-114415. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Virtualization Software

Name

• Kubernetes

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5
• 1.7.6
• 1.7.7
• 1.7.8
• 1.7.9
• 1.7.10
• 1.7.11
• 1.7.12
• 1.7.13
• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.8.6
• 1.8.7
• 1.8.8
• 1.9.0
• 1.9.1
• 1.9.2
• 1.9.3

License

• open-source

Website

• Product: https://github.com/kubernetes/kubernetes/

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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