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GO-2026-5019

Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh

Details

The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.

Are you affected?

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Affected packages

Go / golang.org/x/crypto

Introduced in: 0 Fixed in: 0.52.0

Fix go get golang.org/x/crypto@v0.52.0

References

https://go.dev/issue/79566 [REPORT]
https://groups.google.com/g/golang-announce/c/a082jnz-LvI [WEB]
https://go.dev/cl/781662 [FIX]