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Go-Attestation Improper Input Validation with attacker-controlled TPM Quote

Moderate severity GitHub Reviewed Published Jan 31, 2022 in google/go-attestation • Updated Aug 29, 2023

Package

gomod github.com/google/go-attestation (Go)

Affected versions

< 0.4.0

Patched versions

0.4.0

Description

Impact

An improper input validation vulnerability in go-attestation before 0.4.0 allows local users to provide a maliciously-formed Quote over no/some PCRs, causing AKPublic.Verify to succeed despite the inconsistency. Subsequent use of the same set of PCR values in Eventlog.Verify lacks the authentication performed by quote verification, meaning a local attacker could couple this vulnerability with a maliciously-crafted TCG log in Eventlog.Verify to spoof events in the TCG log, hence defeating remotely-attested measured-boot.

Patches

This issue is resolved in version 0.4.0. If your usage of this library verifies PCRs using multiple quotes, make sure to use the new method AKPublic.VerifyAll() instead of AKPublic.Verify.

References

@twitchy-jsonp twitchy-jsonp published to google/go-attestation Jan 31, 2022
Reviewed Jan 31, 2022
Published to the GitHub Advisory Database Feb 1, 2022
Published by the National Vulnerability Database Feb 4, 2022
Last updated Aug 29, 2023

Severity

Moderate
4.0
/ 10

CVSS base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weaknesses

CVE ID

CVE-2022-0317

GHSA ID

GHSA-99cg-575x-774p

Source code

Credits

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