CVE-2021-20487 : IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicio

IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.

Published 2021-05-26 17:15:14

Updated 2021-06-14 15:11:41

Source IBM Corporation

View at NVD, CVE.org

Products affected by CVE-2021-20487

IBM » Power9 System Firmware
Versions from including (>=) fw940.00 and before (<) fw940.20
cpe:2.3:o:ibm:power9_system_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: IBM » 9008-22l » Version: N/A
When used together with: IBM » 9009-22a » Version: N/A
When used together with: IBM » 9009-41a » Version: N/A
When used together with: IBM » 9009-42a » Version: N/A
When used together with: IBM » 9040-mr9 » Version: N/A
When used together with: IBM » 9080-m9s » Version: N/A
When used together with: IBM » 9223-22h » Version: N/A
When used together with: IBM » 9223-42h » Version: N/A
IBM » Power9 System Firmware
Versions from including (>=) fw930.00 and before (<) fw930.30
cpe:2.3:o:ibm:power9_system_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: IBM » 9008-22l » Version: N/A
When used together with: IBM » 9009-22a » Version: N/A
When used together with: IBM » 9009-41a » Version: N/A
When used together with: IBM » 9009-42a » Version: N/A
When used together with: IBM » 9040-mr9 » Version: N/A
When used together with: IBM » 9080-m9s » Version: N/A
When used together with: IBM » 9223-22h » Version: N/A
When used together with: IBM » 9223-42h » Version: N/A
IBM » Power9 System Firmware
Versions before (<) fw950.00
cpe:2.3:o:ibm:power9_system_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: IBM » 9009-22g » Version: N/A
When used together with: IBM » 9009-41g » Version: N/A
When used together with: IBM » 9009-42g » Version: N/A
When used together with: IBM » 9223-22s » Version: N/A
When used together with: IBM » 9223-42s » Version: N/A
IBM » Scale-out Lc System Firmware
Versions before (<) op940.20
cpe:2.3:o:ibm:scale-out_lc_system_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: IBM » 8335-gth » Version: N/A
When used together with: IBM » 8335-gtx » Version: N/A
When used together with: IBM » 9183-22x » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-20487

EPSS FAQ

0.09%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 39 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20487

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.5	MEDIUM	AV:N/AC:L/Au:S/C:P/I:P/A:P	8.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
8.0	HIGH	CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H	1.3	6.0	IBM Corporation
Attack Vector: Network Attack Complexity: High Privileges Required: High User Interaction: None Scope: Changed Confidentiality: High Integrity: High Availability: High
9.1	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	2.3	6.0	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Changed Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-20487

CWE-347 Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-20487

https://www.ibm.com/support/pages/node/6455911

Security Bulletin: This Power System update is being released to address CVE-2021-20487
Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/197730

IBM Power9 Self Boot Engine (SBE) privilege escalation CVE-2021-20487 Vulnerability Report
VDB Entry;Vendor Advisory

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Vulnerability Details : CVE-2021-20487

Products affected by CVE-2021-20487

Exploit prediction scoring system (EPSS) score for CVE-2021-20487

CVSS scores for CVE-2021-20487

CWE ids for CVE-2021-20487

References for CVE-2021-20487