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Vulnerability Details :

CVE-2020-8918

Summary
Assigner-Google
Assigner Org ID-14ed7db2-1595-443d-9d34-6215bf890778
Published At-11 Aug, 2020 | 18:35
Updated At-04 Aug, 2024 | 10:12
Rejected At-
Credits

TPM 1.2 key authorization values are vulnerable to a TPM transport eavesdropper

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'.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Google
Assigner Org ID:14ed7db2-1595-443d-9d34-6215bf890778
Published At:11 Aug, 2020 | 18:35
Updated At:04 Aug, 2024 | 10:12
Rejected At:
▼CVE Numbering Authority (CNA)
TPM 1.2 key authorization values are vulnerable to a TPM transport eavesdropper

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'.

Affected Products
Vendor
Google LLCGoogle LLC
Product
google/go-tpm library
Versions
Affected
  • From stable before 0.3.0 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-665CWE-665 Improper Initialization
Type: CWE
CWE ID: CWE-665
Description: CWE-665 Improper Initialization
Metrics
VersionBase scoreBase severityVector
3.16.3MEDIUM
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Version: 3.1
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Chris Fenner
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw
x_refsource_CONFIRM
Hyperlink: https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw
Resource:
x_refsource_CONFIRM
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw
x_refsource_CONFIRM
x_transferred
Hyperlink: https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw
Resource:
x_refsource_CONFIRM
x_transferred
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve-coordination@google.com
Published At:11 Aug, 2020 | 19:15
Updated At:18 Aug, 2020 | 13:32

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'.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.17.1HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Secondary3.16.3MEDIUM
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Primary2.03.6LOW
AV:L/AC:L/Au:N/C:P/I:P/A:N
Type: Primary
Version: 3.1
Base score: 7.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Type: Primary
Version: 2.0
Base score: 3.6
Base severity: LOW
Vector:
AV:L/AC:L/Au:N/C:P/I:P/A:N
CPE Matches

Google LLC
google
>>go-tpm>>Versions before 0.3.0(exclusive)
cpe:2.3:a:google:go-tpm:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-665Primarynvd@nist.gov
CWE-665Secondarycve-coordination@google.com
CWE ID: CWE-665
Type: Primary
Source: nvd@nist.gov
CWE ID: CWE-665
Type: Secondary
Source: cve-coordination@google.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpwcve-coordination@google.com
Exploit
Third Party Advisory
Hyperlink: https://github.com/google/go-tpm/security/advisories/GHSA-5x29-3hr9-6wpw
Source: cve-coordination@google.com
Resource:
Exploit
Third Party Advisory

Change History

0
Information is not available yet

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CWE ID-CWE-665
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