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TI-2020-07161 Aliases CVE-2020-8918GHSA-5x29-3hr9-6wpw

TPM 1.2 key authorization values are vulnerable to a TPM transport eavesdropper

Priority LOW 30CWE-665Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

An improperly initialized 'migrationAuth' value in Google's go-tpm TPM1.2 library versions prior to 0.3.0 can lead an eavesdropping attacker to discover the auth value for a key created with CreateWrapKey. An attacker listening in on the channel can collect both 'encUsageAuth' and 'encMigrationAuth', and then can calculate 'usageAuth ^ encMigrationAuth' as the 'migrationAuth' can be guessed for all keys created with CreateWrapKey. TPM2.0 is not impacted by this. We recommend updating your library to 0.3.0 or later, or, if you cannot update, to call CreateWrapKey with a random 20-byte value for 'migrationAuth'.

Why it matters now

EPSS 0.0018 7th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed google/go-tpm library (Google LLC): 0.3.0github.com/google/go-tpm (Go): 0.3.0

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Googlegoogle/go-tpm librarystable to before 0.3.00.3.0Patch availableCNA
—github.com/google/go-tpm (Go)before 0.3.00.3.0Patch availableGHSA-5x29-3hr9-6wpw
  • google/go-tpm library VendorGoogle Affected stable to before 0.3.0 Fixed in 0.3.0 Patch available CNA
  • github.com/google/go-tpm (Go) Vendor— Affected before 0.3.0 Fixed in 0.3.0 Patch available GHSA-5x29-3hr9-6wpw

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:google:go-tpm:*:*:*:*:*:*:*:*before 0.3.0VulnerableGoogle
  • cpe:2.3:a:google:go-tpm:*:*:*:*:*:*:*:* Versions before 0.3.0 Vulnerable ·Google

Remediation

  • Fix · CNA google/go-tpm library (Google LLC) Fixed in 0.3.0
  • Fix · GHSA-5x29-3hr9-6wpw github.com/google/go-tpm (Go) Fixed in 0.3.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-8918
  2. 2026-10-03 Alias added: GHSA-5x29-3hr9-6wpw

References

Exploit 1

Advisory 1

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences