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GHSA-r9jw-mwhq-wp62

PyJWT vulnerable to key confusion attacks

Source: GitHub Advisory Database (reviewed) High CVE-2017-11424

Packages

EcosystemPackageAffectedFixed in
PyPI pyjwt < 1.5.1 1.5.1

Details

As written in the advisory (Markdown source, shown as plain text).

In PyJWT 1.5.0 and below the `invalid_strings` check in `HMACAlgorithm.prepare_key` does not account for all PEM encoded public keys. Specifically, the PKCS1 PEM encoded format would be allowed because it is prefaced with the string `-----BEGIN RSA PUBLIC KEY-----` which is not accounted for. This enables symmetric/asymmetric key confusion attacks against users using the PKCS1 PEM encoded public keys, which would allow an attacker to craft JWTs from scratch.

References

External links from the advisory. They lead to third-party sites.