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CVE-2017-11424
Published: Aug 24, 2017
Modified: Aug 5, 2024
PUBLISHED
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.
| Vendor | Product | Versions |
|---|---|---|
n/a | n/a | affected n/a |
References
DSA-3979
vendor-advisory
x_refsource_DEBIAN
https://github.com/jpadilla/pyjwt/pull/277
x_refsource_CONFIRM
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