Vulnerability Details : CVE-2023-42816
Kyverno is a policy engine designed for Kubernetes. A security vulnerability was found in Kyverno where an attacker could cause denial of service of Kyverno. The vulnerability was in Kyvernos Notary verifier. An attacker would need control over the registry from which Kyverno would fetch signatures. With such a position, the attacker could return a malicious response to Kyverno, when Kyverno would send a request to the registry. The malicious response would cause denial of service of Kyverno, such that other users' admission requests would be blocked from being processed. This is a vulnerability in a new component released in v1.11.0. The only users affected by this are those that have been building Kyverno from source at the main branch which is not encouraged. Users consuming official Kyverno releases are not affected. There are no known cases of this vulnerability being exploited in the wild.
Vulnerability category: Denial of service
Products affected by CVE-2023-42816
- cpe:2.3:a:nirmata:kyverno:1.11.0:-:*:*:*:go:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-42816
0.11%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 47 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-42816
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.3
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H |
1.6
|
3.6
|
NIST | |
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H |
1.6
|
4.0
|
GitHub, Inc. |
CWE ids for CVE-2023-42816
-
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.Assigned by: security-advisories@github.com (Secondary)
References for CVE-2023-42816
-
https://github.com/kyverno/kyverno/commit/fec2992e3f9fcd6b9c62267522c09b182e7df73b
fix: address vulnerability issues in notary implementations (#8428) · kyverno/kyverno@fec2992 · GitHubPatch
-
https://github.com/kyverno/kyverno/commit/80d139bb5d1d9d7e907abe851b97dc73821a5be2
Added `fetchAttestations` method to notaryV2 implimentation (#6800) · kyverno/kyverno@80d139b · GitHubPatch
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https://github.com/kyverno/kyverno/security/advisories/GHSA-4mp4-46gq-hv3r
Denial of service from malicious signature · Advisory · kyverno/kyverno · GitHubVendor Advisory
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https://github.com/kyverno/kyverno/pull/8428
Check payload counts and limits for image verification data returned from registries by vishal-chdhry · Pull Request #8428 · kyverno/kyverno · GitHubPatch
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