Access Restriction Bypass The advisory has been revoked - it doesn't affect any version of package pyjwt Open this link in a new tab
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Test your applications- Snyk ID SNYK-PYTHON-PYJWT-40753
- published 4 Dec 2017
- disclosed 22 Jun 2017
- credit Unknown
Introduced: 22 Jun 2017
CVE-2017-11424 Open this link in a new tabHow to fix?
Upgrade pyjwt to version 1.5.1 or higher.
Overview
Affected versions of pyjwt are vulnerable to Access Restriction Bypass.
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.