GMS-2016-54: Forgeable Public/Private Tokens

July 26, 2016

Since “algorithm” isn’t enforced in jws.verify(), a malicious user could choose what algorithm is sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA’s public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.

References

auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/
github.com/brianloveswords/node-jws/commit/585d0e1e97b6747c10cf5b7689ccc5618a89b299

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