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Improper Authentication in Capsule Proxy

High severity GitHub Reviewed Published Feb 20, 2022 in projectcapsule/capsule-proxy • Updated Feb 3, 2023

Package

gomod github.com/clastix/capsule-proxy (Go)

Affected versions

< 0.2.1

Patched versions

0.2.1

Description

Impact

Using a malicious Connection header, an attacker with a proper authentication mechanism could start a privilege escalation towards the Kubernetes API Server, being able to exploit the cluster-admin Role bound to capsule-proxy.

Patches

Patch has been merged in the v0.2.1 release.

Workarounds

Upgrading is mandatory.

References

@prometherion prometherion published to projectcapsule/capsule-proxy Feb 20, 2022
Published by the National Vulnerability Database Feb 22, 2022
Published to the GitHub Advisory Database Feb 23, 2022
Reviewed Feb 23, 2022
Last updated Feb 3, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.420%
(74th percentile)

Weaknesses

CVE ID

CVE-2022-23652

GHSA ID

GHSA-9cwv-cppx-mqjm

Source code

Credits

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