Vulnerability Details 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'.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.4%
CVSS Severity
CVSS v3 Score 6.3
CVSS v2 Score 3.6
References
Products affected by CVE-2020-8918
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cpe:2.3:a:google:go-tpm:-
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cpe:2.3:a:google:go-tpm:0.0.1
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cpe:2.3:a:google:go-tpm:0.1.0
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cpe:2.3:a:google:go-tpm:0.1.1
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cpe:2.3:a:google:go-tpm:0.2.0