TPM 1.2 key authorization values are vulnerable to a TPM transport eavesdropper
Published Aug 11, 2020
7.1
HIGHCVSS 3.1
EPSS 0.18%
Description
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'.
Affected products
-
- Version stableStatusaffectedConstraints<0.3.0
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Google LLC | Google/go-Tpm Library | n/a |
|
No data.
No Red Hat product state for this CVE.
github.com/google/go-tpm
Go
Introduced 0 Fixed 0.3.0
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/google/go-tpm | 0 | 0.3.0 |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:P/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.18% (0.00180) | 6.83th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.18% (0.00180) | 7.79th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.05% (0.00051) | 20.64th | v3 (v2023.03.01) |
| May 22, 2024 | 0.05% (0.00051) | 19.72th | v3 (v2023.03.01) |
| Dec 15, 2023 | 0.05% (0.00051) | 17.58th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00048) | 14.74th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.40% (0.01404) | 49.02th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.77% (0.00765) | 20.97th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.17% (0.00171) | 0.00th | v1 |
References (6)
- https://github.com/advisories/GHSA-5x29-3hr9-6wpw Advisory
- https://github.com/google/go-tpm/commit/d7806cce857a1a020190c03348e5361725d8f141
- https://github.com/google/go-tpm/pull/195
- https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw x_refsource_CONFIRMExploitThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2020-8918
- https://pkg.go.dev/vuln/GO-2021-0095
Change history (0)
No recorded changes yet.