Cluster secret disclosure via custom snippet injection
Published Oct 29, 2021 · Updated Sep 16, 2024
Improper input validation in Kubernetes ingress-nginx 0.49.0 and earlier or 1.0.0 allows remote authenticated users to read cluster secrets. The controller accepts server-snippet and configuration-snippet annotations and writes their directives into the generated nginx.conf, allowing NGINX to expose mounted credentials. The attacker must have permission to create or update Ingress objects; the controller service account can provide access to secrets across all namespaces.
Summary
What happened
Improper input validation in Kubernetes ingress-nginx 0.49.0 and earlier or 1.0.0 allows remote authenticated users to read cluster secrets. The controller accepts server-snippet and configuration-snippet annotations and writes their directives into the generated nginx.conf, allowing NGINX to expose mounted credentials. The attacker must have permission to create or update Ingress objects; the controller service account can provide access to secrets across all namespaces.
The record
- CVE
- CVE-2021-25742
- Published
- Oct 29, 2021
- Updated
- Sep 16, 2024
- Vendor
- Kubernetes
- Product
- ingress-nginx
- Classifications
- CWE-20, T1068, T1552.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 29, 2021CVE publishedPublication date reported by the CVE source.
- Sep 16, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <=0.49.0
- Affected versionversion=unspecified <=1.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo