CVE-2021-25749 runAsNonRoot logic bypass for Windows containers
High 7.8
Published
Updated
Check this codebase for CVE-2021-25749 and fix it if it is affected.
What it is: CVE-2021-25749 is a high-severity vulnerability in Kubernetes Kubernetes, published on 24 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-25749 in the wild and no public exploit code.
Affected product: Kubernetes Kubernetes. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-25749/ (Markdown: https://insights.sbomify.com/CVE-2021-25749/index.md)
Attackers can bypass runAsNonRoot restrictions in Windows containers to execute code with ContainerAdministrator privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-25749?
CVE-2021-25749 is a high-severity vulnerability in Kubernetes Kubernetes, published on 24 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Windows workloads can run as ContainerAdministrator even when those workloads set the runAsNonRoot option to true.
Weakness: CWE-284
Which versions are affected by CVE-2021-25749?
It affects 1 product.
Products include Kubernetes Kubernetes.
How do I fix CVE-2021-25749?
Apply the vendor's patch.
Is CVE-2021-25749 being exploited?
There is no known exploitation of CVE-2021-25749 in the wild and no public exploit code.
Other vulnerabilities in Kubernetes Kubernetes
- CVE-2018-1002105 Privilege Escalation in Kubernetes
- CVE-2017-1000056 Kubernetes Privilege Escalation
- CVE-2016-1906 Authorization bypass in Openshift
- CVE-2023-3676 Kubernetes - Windows nodes - Insufficient input sanitization leads to privilege escalation
- CVE-2023-3955 Kubernetes - Windows nodes - Insufficient input sanitization leads to privilege escalation
Sources
Also known as GHSA-vv2r-w4hf-7mhr.