Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP3 | solo | 4.1.2-bp153.2.3.1 | openSUSE-SU-2021:1019-1 |
| SUSE Package Hub 15 SP2 | solo | 4.1.2-bp153.2.3.1 | openSUSE-SU-2021:1019-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | solo | 4.1.2-bp153.2.3.1 | openSUSE-SU-2021:1019-1 |
| openSUSE Leap 15.2 | solo | 4.1.2-bp153.2.3.1 | openSUSE-SU-2021:1019-1 |
Advisories 1
- openSUSE-SU-2021:1019-1 Security update for solo SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://www.aisec.fraunhofer.de/en/FirmwareProtection.html
- https://twitter.com/SoloKeysSec
- https://solokeys.com
- https://eprint.iacr.org/2021/640
- https://github.com/solokeys/solo/commit/a9c02cd354f34b48195a342c7f524abdef5cbcec
- https://www.aisec.fraunhofer.de/de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html