Kubernetes csi-proxy vulnerable to privilege escalation due to improper input validation

CVE-2023-3893 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Kubernetes is vulnerable to privilege escalation when a user that can create pods on Windows nodes running kubernetes-csi-proxy may be able to escalate to admin privileges on those nodes. Kubernetes clusters are only affected if they include Windows nodes running kubernetes-csi-proxy.

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
—
Source code
Browse source ↗
Published (advisory)
2023-11-03 18:30:24 UTC
Updated
2025-07-09 15:32:57 UTC
GitHub reviewed
2023-11-03 20:42:49 UTC
NVD published
2023-11-03

EPSS Score

Score Percentile
3.69% 87.51%

CVSS Scores

Base score Version Severity Vector
8.8 3.1 —
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-r6cc-7wj7-gfx2 ↗
CVE CVE-2023-3893 ↗

CWEs

CWE id Name
CWE-20 Improper Input Validation

Affected packages (4)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
go github.com/kubernetes-csi/csi-proxy/v2 = 2.0.0-alpha.0 2.0.0-alpha.1 —
go github.com/kubernetes-csi/csi-proxy >= 0.1.0-rc1, <= 1.1.2 1.1.3 —
go github.com/kubernetes-csi/csi-proxy < 0.0.0-20230821192013-2523e6674ded 0.0.0-20230821192013-2523e6674ded —
go github.com/kubernetes-csi/csi-proxy >= 1.1.3-0, < 1.1.3-0.20230821192013-2523e6674ded 1.1.3-0.20230821192013-2523e6674ded —

References

cvelogic Threat Intelligence