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Vulnerability CVE-2017-12880
Published: 2017-08-16
| Description: |
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: |
https://github.com/jpadilla/pyjwthttps://github.com/jpadilla/pyjwt/pull/277
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