Authentication Bypass Affecting pyjwt package, versions [,1.5.1)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.08% (37th percentile)

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  • Snyk IDSNYK-PYTHON-PYJWT-40693
  • published9 Nov 2017
  • disclosed21 Jun 2017
  • creditUnknown

Introduced: 21 Jun 2017

CVE-2017-11424  (opens in a new tab)
CWE-284  (opens in a new tab)

How to fix?

Upgrade pyjwt to version 1.5.1 or higher.

Overview

pyjwt is a JSON Web Token implementation in Python.

Affected versions of the package are vulnerable to Authentication 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.

CVSS Scores

version 3.1