CVE-2020-8918 (GCVE-0-2020-8918)

Vulnerability from cvelistv5 – Published: 2020-08-11 18:35 – Updated: 2024-08-04 10:12
VLAI
Title
TPM 1.2 key authorization values are vulnerable to a TPM transport eavesdropper
Summary
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'.
Severity
6.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-665 - Improper Initialization
Assigner
Google CNA
References
Impacted products
Vendor Product Version
Google LLC google/go-tpm library Affected: stable , < 0.3.0 (custom)
Create a notification for this product.
Credits
Chris Fenner
Show details on NVD website
To clipboard 

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