Kubernetes kube-controller-manager up to 1.15.11/1.16.8/1.17.4 server-side request forgery

Summaryinfo

A vulnerability, which was classified as critical, has been found in Kubernetes kube-controller-manager up to 1.15.11/1.16.8/1.17.4. This affects an unknown function. This manipulation causes server-side request forgery. This vulnerability is handled as CVE-2020-8555. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Kubernetes kube-controller-manager up to 1.15.11/1.16.8/1.17.4 (Virtualization Software). Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality. The summary by CVE is:

The Kubernetes kube-controller-manager in versions v1.0-1.14, versions prior to v1.15.12, v1.16.9, v1.17.5, and version v1.18.0 are vulnerable to a Server Side Request Forgery (SSRF) that allows certain authorized users to leak up to 500 bytes of arbitrary information from unprotected endpoints within the master's host network (such as link-local or loopback services).

The weakness was released 06/05/2020 (GitHub Repository). The advisory is shared at github.com. This vulnerability is known as CVE-2020-8555 since 02/03/2020. The exploitation appears to be difficult. The attack can be launched remotely. The successful exploitation needs a single authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 256688 (Linux Distros Unpatched Vulnerability : CVE-2020-8562), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.15.12, 1.16.9, 1.17.5 or 1.18.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (256688). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Virtualization Software

Vendor

• Kubernetes

Name

• kube-controller-manager

Version

• 1.15.0
• 1.15.1
• 1.15.2
• 1.15.3
• 1.15.4
• 1.15.5
• 1.15.6
• 1.15.7
• 1.15.8
• 1.15.9
• 1.15.10
• 1.15.11
• 1.16.0
• 1.16.1
• 1.16.2
• 1.16.3
• 1.16.4
• 1.16.5
• 1.16.6
• 1.16.7
• 1.16.8
• 1.17.0
• 1.17.1
• 1.17.2
• 1.17.3
• 1.17.4

License

• open-source

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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