CVE-2023-3674

Trust-state concealment via swallowed signature exception

Published Jul 19, 2023 · Updated Nov 21, 2025

Improper attestation validation in Keylime on Red Hat Enterprise Linux 9 allows local users to conceal an untrusted system state. The checkquote function catches an InvalidSignature exception, logs the failure, and continues processing the TPM quote instead of rejecting it. Exploitation requires attackers to modify a Keylime agent and persuade an administrator to deploy it, enabling invalid measurement lists to hide the monitored system's trust state.

CVSS severity2.3
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper attestation validation in Keylime on Red Hat Enterprise Linux 9 allows local users to conceal an untrusted system state. The checkquote function catches an InvalidSignature exception, logs the failure, and continues processing the TPM quote instead of rejecting it. Exploitation requires attackers to modify a Keylime agent and persuade an administrator to deploy it, enabling invalid measurement lists to hide the monitored system's trust state.

The record

CVE
CVE-2023-3674
Published
Jul 19, 2023
Updated
Nov 21, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 9
Classifications
CWE-1283, T1562.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

2.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
2.3Red HatCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1283Mutable Attestation or Measurement Reporting Data
T1562.001Impair Defenses: Disable or Modify Tools

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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