Improper Limitation of a Pathname to a Restricted Directory in Fabric8 Kubernetes Client

CVE-2021-20218 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

A flaw was found in the fabric8 kubernetes-client in version 4.2.0 and after. This flaw allows a malicious pod/container to cause applications using the fabric8 kubernetes-client copy command to extract files outside the working path. The highest threat from this vulnerability is to integrity and system availability. This has been fixed in kubernetes-client-4.13.2 kubernetes-client-5.0.2 kubernetes-client-4.11.2 kubernetes-client-4.7.2

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
—
Source code
Not specified
Published (advisory)
2022-05-24 17:44:37 UTC
Updated
2023-01-27 05:02:35 UTC
GitHub reviewed
2022-06-22 18:50:29 UTC
NVD published
2021-03-16

EPSS Score

Score Percentile
0.59% 68.51%

CVSS Scores

Base score Version Severity Vector
7.4 3.1 —
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
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:N)
Doesn’t really leak secrets in a meaningful 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-jwh2-ffg4-48xc ↗
CVE CVE-2021-20218 ↗

CWEs

CWE id Name
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Affected packages (4)

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

Ecosystem Package Vulnerable range First patched Vulnerable functions
maven io.fabric8:kubernetes-client >= 4.2.0, <= 4.7.1 4.7.2 —
maven io.fabric8:kubernetes-client >= 4.8.0, <= 4.11.1 4.11.2 —
maven io.fabric8:kubernetes-client >= 4.12.0, <= 4.13.1 4.13.2 —
maven io.fabric8:kubernetes-client >= 5.0.0, <= 5.0.1 5.0.2 —

References

cvelogic Threat Intelligence