SB2020081131 - Improper Initialization in Google go-tpm

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Main Vulnerability Database SB2020081131

SB2020081131 - Improper Initialization in Google go-tpm

Published: August 11, 2020 Updated: August 30, 2020

Security Bulletin ID SB2020081131
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Improper Initialization (CVE-ID: CVE-2020-8918)

The vulnerability allows a local authenticated user to read and manipulate data.

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'.


Remediation

Install update from vendor's website.

References