GHSA-8qff-qr5q-5pr8 OpenPGP.js's message signature verification can be spoofed

• npm openpgp: >= 5.0.1, < 5.11.3 → fixed in 5.11.3 • npm openpgp: >= 6.0.0-alpha.0, < 6.1.1 → fixed in 6.1.1

Impact A maliciously modified message can be passed to either `openpgp.verify` or `openpgp.decrypt`, causing these functions to return a valid signature verification result while returning data that was not actually signed. This flaw allows signature verifications of inline (non-detached) signed messages (using `openpgp.verify`) and signed-and-encrypted messages (using `openpgp.decrypt` with `verificationKeys`) to be spoofed, since both functions return extracted data that may not match the data that was originally signed. Detached signature verifications are not affected, as no signed data is returned in that case. In order to spoof a message, the attacker needs a single valid message signature (inline or detached) as well as the plaintext data that was legitimately signed, and can then construct an inline-signed message or signed-and-encrypted message with any data of the attacker's choice, which will appear as legitimately signed by affected versions of OpenPGP.js. In other words. any inline-signed message can be modified to return any other data (while still indicating that the signature was valid), and the same is true for signed+encrypted messages if the attacker can obtain a valid signature and encrypt a new message (of the attacker's choice) together with that signature. Both OpenPGP.js v6 and v5 are affected. OpenPGP.js v4 is not affected. Patches The issue has been patched in versions 5.11.3 and 6.1.1. Workarounds • When verifying inline-signed messages, extract the message and signature(s) from the message returned by `openpgp.readMessage`, and verify the(/each) signature as a detached signature by passing the signature and a new message containing only the data (created using `openpgp.createMessage`) to `openpgp.verify`. • When decrypting and verifying signed+encrypted messages, decrypt and verify the message in two steps, by first calling `openpgp.decrypt` without `verificationKeys`, and then passing the returned signature(s) and a new message containing the decrypted data (created using `openpgp.createMessage`) to `openpgp.verify`. Acknowledgements We would like to thank: • Edoardo Geraci and Thomas Rinsma of Codean Labs for finding and reporting this vulnerability • The Sovereign Tech Agency for sponsoring the OpenPGP.js bug bounty program • YesWeHack for hosting the OpenPGP.js bug bounty program