Description

An issue was discovered in Espressif ESP-IDF 2.x, 3.0.x through 3.0.9, 3.1.x through 3.1.6, 3.2.x through 3.2.3, and 3.3.x through 3.3.1. An attacker who uses fault injection to physically disrupt the ESP32 CPU can bypass the Secure Boot digest verification at startup, and boot unverified code from flash. The fault injection attack does not disable the Flash Encryption feature, so if the ESP32 is configured with the recommended combination of Secure Boot and Flash Encryption, then the impact is minimized. If the ESP32 is configured without Flash Encryption then successful fault injection allows arbitrary code execution. To protect devices with Flash Encryption and Secure Boot enabled against this attack, a firmware change must be made to permanently enable Flash Encryption in the field if it is not already permanently enabled.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

NIST: NVD

Base Score:  6.8 MEDIUM

Vector:  CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score:  7.2 HIGH

Vector:  (AV:L/AC:L/Au:N/C:C/I:C/A:C)

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://www.espressif.com/en/news/Espressif_Security_Advisory_Concerning_Fault_Injection_and_Secure_Boot	Mitigation  Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-755	Improper Handling of Exceptional Conditions	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

CWE Remap by NIST 8/24/2020 1:37:01 PM

Action	Type	Old Value	New Value
Changed	CWE	CWE-74	CWE-755

Initial Analysis by NIST 10/15/2019 10:48:57 AM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (excluding) 3.0.9 *cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:* versions from (excluding) 3.1 up to (excluding) 3.1.6 *cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:* versions from (excluding) 3.2 up to (excluding) 3.2.3 *cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:* versions from (including) 3.3 up to (excluding) 3.3.1
Added	CVSS V2		NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Added	CVSS V3.1		NIST AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CWE		NIST CWE-74
Changed	Reference Type	https://www.espressif.com/en/news/Espressif_Security_Advisory_Concerning_Fault_Injection_and_Secure_Boot No Types Assigned	https://www.espressif.com/en/news/Espressif_Security_Advisory_Concerning_Fault_Injection_and_Secure_Boot Mitigation, Vendor Advisory