Upstream information

CVE-2020-8562 at MITRE

Description

As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 3.5
Vector AV:N/AC:M/Au:S/C:P/I:N/A:N
Access Vector Network
Access Complexity Medium
Authentication Single
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 3.1 2.2
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
Access Vector Network Network
Access Complexity High High
Privileges Required Low High
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact Low Low
Integrity Impact None None
Availability Impact None None
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1185502 [REOPENED]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE CaaS Platform 4.0 kubernetes Ignore
SUSE CaaS Platform 4.5 kubernetes-1.18 Ignore
SUSE Enterprise Storage 6 kubernetes Ignore
SUSE Linux Enterprise High Performance Computing 12 kubernetes Ignore
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS kubernetes Ignore
SUSE Linux Enterprise Module for Public Cloud 12 kubernetes Ignore
SUSE Linux Enterprise Server 12 kubernetes Ignore
SUSE Linux Enterprise Server 12 SP3 kubernetes Ignore
SUSE Linux Enterprise Server 12 SP4 kubernetes Ignore
SUSE Linux Enterprise Server 12 SP5 kubernetes Ignore
SUSE Linux Enterprise Server 15 SP1 LTSS kubernetes Ignore
SUSE Linux Enterprise Server Business Critical Linux 15 SP1 kubernetes Ignore
SUSE Linux Enterprise Server for SAP Applications 12 kubernetes Ignore
SUSE Linux Enterprise Server for SAP Applications 12 SP3 kubernetes Ignore
SUSE Linux Enterprise Server for SAP Applications 12 SP4 kubernetes Ignore
SUSE Linux Enterprise Server for SAP Applications 12 SP5 kubernetes Ignore
SUSE Linux Enterprise Server for SAP Applications 15 SP1 kubernetes Ignore
SUSE Manager Proxy 4.0 kubernetes Ignore
SUSE Manager Retail Branch Server 4.0 kubernetes Ignore
SUSE Manager Server 4.0 kubernetes Ignore