Add a notice about verification of keyless signing #1472
Merged
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Verification by Cosign is not perfect. Currently, the
cosign verify-blob
command does not verify the certificate chain against the Fulcio root trust, so the attacker can replacechecksum.txt
,checksum.txt.keyless.sig
, andchecksum.txt.pem
.This way is the same as distributing a different public key for each release and having users download it. That is, verifiers must find a way to safely get
checksum.txt.pem
(in a different way thanchecksum.txt
).