CVE-2022-0317

Measured-boot spoofing via inconsistent PCR quote validation

Published Feb 4, 2022 · Updated Apr 21, 2025

Improper input validation in Google Cloud Go-Attestation before 0.4.0 allows local users to spoof measured-boot event logs. AKPublic.Verify accepts a malicious Quote covering no or only some PCRs and returns success despite the inconsistency; Eventlog.Verify then trusts the unauthenticated PCR set when checking a crafted TCG log. Exploitation requires local control of both inputs and corrupts remote measured-boot decisions without reported confidentiality or availability impact.

CVSS severity4.0
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Google Cloud Go-Attestation before 0.4.0 allows local users to spoof measured-boot event logs. AKPublic.Verify accepts a malicious Quote covering no or only some PCRs and returns success despite the inconsistency; Eventlog.Verify then trusts the unauthenticated PCR set when checking a crafted TCG log. Exploitation requires local control of both inputs and corrupts remote measured-boot decisions without reported confidentiality or availability impact.

The record

CVE
CVE-2022-0317
Published
Feb 4, 2022
Updated
Apr 21, 2025
Vendor
Google Cloud
Product
Go-Attestation
Classifications
CWE-20, T1565
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <0.4.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Google Cloud · Go-Attestationversion=unspecified <0.4.0

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.0Google Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:P/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1565Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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