CVE-2021-25735
Kube-apiserver Node Update Invalid Validating Admission Webhook Bypass
Description
A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.
INFO
Published Date :
Sept. 6, 2021, 12:15 p.m.
Last Modified :
June 26, 2023, 7:16 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
1.2
Public PoC/Exploit Available at Github
CVE-2021-25735 has a 17 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-2021-25735.
| URL | Resource |
|---|---|
| https://github.com/kubernetes/kubernetes/issues/100096 | Patch Third Party Advisory |
| https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y | Mailing List Third Party Advisory |
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).
All CVE - PoC in GitHub
poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate
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⚙ DevSecOps Kubernetes Playground ("A Hacker's Guide to Kubernetes")
Dockerfile Shell Ruby Smarty Jinja HCL
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Dockerfile
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Exploit CVE-2021-25735: Kubernetes Validating Admission Webhook Bypass
Dockerfile JavaScript Shell
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-2021-25735 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-25735 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 [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Jun. 26, 2023
Action Type Old Value New Value Removed CWE NIST CWE-863 Added CWE NIST NVD-CWE-Other -
Initial Analysis by [email protected]
Sep. 13, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H Changed Reference Type https://github.com/kubernetes/kubernetes/issues/100096 No Types Assigned https://github.com/kubernetes/kubernetes/issues/100096 Patch, Third Party Advisory Changed Reference Type https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y No Types Assigned https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y Mailing List, Third Party Advisory Added CWE NIST CWE-863 Added CPE Configuration OR *cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* versions up to (excluding) 1.18.18 *cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* versions from (including) 1.19.0 up to (excluding) 1.19.10 *cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:* versions from (including) 1.20.0 up to (excluding) 1.20.6
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-25735 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-2021-25735
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.07 }} 0.01%
score
0.27907
percentile