CVE-2020-8918 - OpenCVE

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'.

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

Access Vector Local

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact None

AV:L/AC:L/Au:N/C:P/I:P/A:N

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Vendors	Products
Google	Go-tpm

Configuration 1 [-]

cpe:2.3:a:google:go-tpm:*:*:*:*:*:*:*:*

No data.

References

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

History

No history.

MITRE

Status: PUBLISHED

Assigner: Google

Published: 2020-08-11T18:35:11

Updated: 2024-08-04T10:12:11.062Z

Reserved: 2020-02-12T00:00:00

Link: CVE-2020-8918

Vulnrichment

No data.

NVD

Status : Analyzed

Published: 2020-08-11T19:15:17.547

Modified: 2020-08-18T13:32:39.550

Link: CVE-2020-8918

Redhat

No data.

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