CVE-2020-8918
Last modified
CVE-2020-8918 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.
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'.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Go-Tpm | < 0.3.0 |
References
- https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpwExploit, Third Party Advisory
- https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpwExploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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