Vulnerability in Google Go-Tpm
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'.
Vulnerability class: Dirty Pipe (CVE-2022-0847)
EPSS: 0.002 (7.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Google Go-tpm
- Google Llc Google/go-tpm Library — versions stable
Weakness classification (CWE)
References
- cve-coordination@google.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-8918?
- CVE-2020-8918 is a medium-severity vulnerability in Google Go-Tpm, classified under Improper Initialization. CVSS score: 6.3/10. Published 2020-08-11.
- How severe is CVE-2020-8918?
- Medium severity. CVSS v3 base score is 6.3 out of 10.