CVE-2023-48312

Public Exploit
Authentication bypass using an empty token in capsule-proxy

Description

capsule-proxy is a reverse proxy for the capsule operator project. Affected versions are subject to a privilege escalation vulnerability which is based on a missing check if the user is authenticated based on the `TokenReview` result. All the clusters running with the `anonymous-auth` Kubernetes API Server setting disable (set to `false`) are affected since it would be possible to bypass the token review mechanism, interacting with the upper Kubernetes API Server. This privilege escalation cannot be exploited if you're relying only on client certificates (SSL/TLS). This vulnerability has been addressed in version 0.4.6. Users are advised to upgrade.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 0.07%
Vendor Advisory github.com
Affected: projectcapsule capsule-proxy
Published at:
Updated at:

References

Link Tags
https://github.com/projectcapsule/capsule-proxy/security/advisories/GHSA-fpvw-6m5v-hqfp vendor advisory exploit
https://github.com/projectcapsule/capsule-proxy/commit/472404f7006a4152e4eec76dee07324dd1e6e823 patch

Frequently Asked Questions

What is the severity of CVE-2023-48312?
CVE-2023-48312 has been scored as a critical severity vulnerability.
How to fix CVE-2023-48312?
To fix CVE-2023-48312, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-48312 being actively exploited in the wild?
It is possible that CVE-2023-48312 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-48312?
CVE-2023-48312 affects projectcapsule capsule-proxy.
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