Skip to content
Fencer Vulns
medium 6.5

CVE-2023-38201 json

Keylime: challenge-response protocol bypass during agent registration

published 2023-08-25 3 y ago modified 2026-07-08 4 mo ago also GHSA-f4r5-q63f-gcww , PYSEC-2023-160 , EUVD-2023-0106

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi keylime 7.5.0
  • Red Hat Red Hat Enterprise Linux 9 0:6.5.2-6.el9_2
  • keylime RHEL 9 6.5.2-6.el9_2
  • keylime-base RHEL 9 6.5.2-6.el9_2
  • keylime-tenant RHEL 9 6.5.2-6.el9_2
  • keylime-selinux RHEL 9 6.5.2-6.el9_2
  • python3-keylime RHEL 9 6.5.2-6.el9_2
  • keylime-verifier RHEL 9 6.5.2-6.el9_2
  • keylime-registrar RHEL 9 6.5.2-6.el9_2

red hat advisories RHSA-2023:5080

  • keylime SLE Module for Basesystem 15 SP5, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.5 +1 more 6.3.2-150400.4.20.1

suse advisories SUSE-SU-2023:3525-1

  • keylime AlmaLinux 9 6.5.2-6.el9_2.alma.1
  • keylime-base AlmaLinux 9 6.5.2-6.el9_2.alma.1
  • keylime-tenant AlmaLinux 9 6.5.2-6.el9_2.alma.1
  • keylime-selinux AlmaLinux 9 6.5.2-6.el9_2.alma.1
  • python3-keylime AlmaLinux 9 6.5.2-6.el9_2.alma.1
  • keylime-verifier AlmaLinux 9 6.5.2-6.el9_2.alma.1
  • keylime-registrar AlmaLinux 9 6.5.2-6.el9_2.alma.1

almalinux advisories ALSA-2023:5080

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-38201 updated cvss 6.5

Keylime: challenge-response protocol bypass during agent registration

  • Red Hat Enterprise Linux AppStream (v. 9) keylime 6.5.2-6.el9_2, keylime-base 6.5.2-6.el9_2, keylime-tenant 6.5.2-6.el9_2, keylime-selinux 6.5.2-6.el9_2, python3-keylime 6.5.2-6.el9_2, keylime-verifier 6.5.2-6.el9_2, +1 more
    fixed: vendor fix RHSA-2023:5080

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
OSV 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi keylime
<7.5.0
7.5.0

Affected products

  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-639 Authorization Bypass Through User-Controlled Key

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.