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CVE-2020-27208

Date: May 21, 2021

The flash read-out protection (RDP) level is not enforced during the device initialization phase of the SoloKeys Solo 4.0.0 & Somu and the Nitrokey FIDO2 token. This allows an adversary to downgrade the RDP level and access secrets such as private ECC keys from SRAM via the debug interface.

Language: C++

Severity Score

Related Resources (8)

https://nvd.nist.gov/vuln/detail/CVE-2020-27208
https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html
https://www.aisec.fraunhofer.de/en/FirmwareProtection.html
https://twitter.com/SoloKeysSec
https://github.com/solokeys/solo/commit/a9c02cd354f34b48195a342c7f524abdef5cbcec
https://solokeys.com
https://eprint.iacr.org/2021/640
https://www.mend.io/vulnerability-database/CVE-2020-27208

Severity Score

Weakness Type (CWE)

Inadequate Encryption Strength

CWE-326

CVSS v3.1

Base Score:
Attack Vector (AV): PHYSICAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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