CVE-2017-11424 | BDVDB-2026-89508 Detail

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.

Impact#

No impact statement in the source data.

Weaknesses#

No weakness recorded in the source data.

References#

http://www.debian.org/security/2017/dsa-3979
https://github.com/jpadilla/pyjwt/pull/277

Exploit#

No public exploit known

History#

Version 12017-08-24Record published in the CVE List.
Version 22024-08-05Most recent update recorded in the CVE List.