PT-2020-20206 · Kubernetes+1 · Kubernetes+1
Brice Augras
·
Published
2020-06-02
·
Updated
2026-06-01
·
CVE-2020-8555
CVSS v3.1
6.3
Medium
| Vector | AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
Kubernetes versions prior to 1.15.12
Kubernetes versions prior to 1.16.9
Kubernetes versions prior to 1.17.5
Kubernetes versions 1.0 through 1.14
Kubernetes version 1.18.0
Description
The issue 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, due to a Server Side Request Forgery (SSRF) in the Kubernetes kube-controller-manager. An attacker with permission to create Pods with a specific type of Volume or permission to create StorageClass can force the kube-controller-manager to make GET or POST requests from the master host network to a user-provided unverified URL. It is reported that authentication data does not leak, but the leaked data may contain something interesting.
Recommendations
For versions prior to 1.15.12, update to version 1.15.12 or later.
For versions prior to 1.16.9, update to version 1.16.9 or later.
For versions prior to 1.17.5, update to version 1.17.5 or later.
For versions 1.0 through 1.14, update to a version outside of this range.
For version 1.18.0, update to a version later than 1.18.0.
As a temporary workaround, consider restricting access to the
kube-controller-manager to minimize the risk of exploitation.Exploit
Fix
SSRF
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Kubernetes