CVE-2017-11424

Source

https://nvd.nist.gov/vuln/detail/CVE-2017-11424

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-11424.json

Aliases

• GHSA-r9jw-mwhq-wp62
• PYSEC-2017-24

Related

• DSA-3979-1
• USN-3407-1

Published

2017-08-24T16:29:00Z

Modified

2023-11-29T05:57:01.485204Z

Details

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

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