#VU30267 Server-Side Request Forgery (SSRF) in Kubernetes - CVE-2020-8555

Vulnerability identifier: #VU30267

Vulnerability risk: Medium

CVSSv4.0: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-8555

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Kubernetes
Server applications / Frameworks for developing and running applications

Vendor: Kubernetes

Description

The vulnerability allows a remote authenticated user to gain access to sensitive information.

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).

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kubernetes: 1.17.0 - 1.17.4

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External links
https://www.openwall.com/lists/oss-security/2020/06/01/4
https://github.com/kubernetes/kubernetes/issues/91542
https://groups.google.com/d/topic/kubernetes-security-announce/kEK27tqqs30/discussion

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.