Vulnerability: Downgrade Attack on Flash Read-Out Protection (RDP) in SoloKeys Solo 4.0.0, Somu, and Nitrokey FIDO2 Token

CVE-2020-27208 · MEDIUM Severity

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

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.

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