CVE-2020-8918

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'.

Score

CVSS 3.1 7.1 High

Status

Modified - cve-coordination@google.com

Published

2020-08-11

Last modified

2024-08-04

Weaknesses

CWE-665

Affected products

• Go-tpm (Google)
• Googlego-tpm Library (Google Llc)

References

• https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw