CVE-2020-8562
Kubernetes DNS Server Invalidates Neighbor Cache Path Manipulation
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.
INFO
Published Date :
Feb. 1, 2022, 11:15 a.m.
Last Modified :
Nov. 21, 2024, 5:39 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] |
Public PoC/Exploit Available at Github
CVE-2020-8562 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-8562.
| URL | Resource |
|---|---|
| https://github.com/kubernetes/kubernetes/issues/101493 | Issue Tracking Mitigation Third Party Advisory |
| https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY | Mailing List Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220225-0002/ | Third Party Advisory |
| https://github.com/kubernetes/kubernetes/issues/101493 | Issue Tracking Mitigation Third Party Advisory |
| https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY | Mailing List Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20220225-0002/ | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-8562 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-8562
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
None
⚙ DevSecOps Kubernetes Playground ("A Hacker's Guide to Kubernetes")
Dockerfile Shell Ruby Smarty Jinja HCL
awesome resources about cloud native security 🐿
cloud-native container-security cloud-native-security kubernetes-security container-escape k8s kubernetes container docker docker-security serverless serverless-security cloud-security cloud-computing
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-8562 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-8562 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://github.com/kubernetes/kubernetes/issues/101493 Added Reference https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY Added Reference https://security.netapp.com/advisory/ntap-20220225-0002/ -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Mar. 29, 2022
Action Type Old Value New Value Changed Reference Type https://security.netapp.com/advisory/ntap-20220225-0002/ No Types Assigned https://security.netapp.com/advisory/ntap-20220225-0002/ Third Party Advisory -
CVE Modified by [email protected]
Feb. 25, 2022
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20220225-0002/ [No Types Assigned] Added CWE Kubernetes CWE-367 -
Initial Analysis by [email protected]
Feb. 07, 2022
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N Changed Reference Type https://github.com/kubernetes/kubernetes/issues/101493 No Types Assigned https://github.com/kubernetes/kubernetes/issues/101493 Issue Tracking, Mitigation, Third Party Advisory Changed Reference Type https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY No Types Assigned https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY Mailing List, Third Party Advisory Added CWE NIST CWE-367 Added CPE Configuration OR *cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* versions up to (including) 1.18.18 *cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* versions from (including) 1.19.0 up to (including) 1.19.10 *cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* versions from (including) 1.20.0 up to (including) 1.20.6 *cpe:2.3:a:kubernetes:kubernetes:1.21.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 01, 2022
Action Type Old Value New Value Removed CWE Kubernetes CWE-367
Vulnerability Scoring Details
Base CVSS Score: 3.1
Base CVSS Score: 3.5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.01%
score
0.17595
percentile