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.
Analysis and contextual insights are available on OpenCVE Cloud.
Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
Debian DSA |
DSA-3979-1 | pyjwt security update |
EUVD |
EUVD-2017-0103 | 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. |
Github GHSA |
GHSA-r9jw-mwhq-wp62 | PyJWT vulnerable to key confusion attacks |
Ubuntu USN |
USN-3407-1 | PyJWT vulnerability |
References
History
No history.
Status: PUBLISHED
Assigner: duo
Published:
Updated: 2024-08-05T18:12:39.550Z
Reserved: 2017-07-18T00:00:00.000Z
Link: CVE-2017-11424
No data.
Status : Modified
Published: 2017-08-24T16:29:00.197
Modified: 2026-05-13T00:24:29.033
Link: CVE-2017-11424
OpenCVE Enrichment
No data.
Weaknesses
Debian DSA
EUVD
Github GHSA
Ubuntu USN