CVE-2022-29217 Key confusion through non-blocklisted public key formats in PyJWT

2022-05-2414:10:10

CWE-327

GitHub_M

www.cve.org

7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

0.001 Low

EPSS

Percentile

45.6%

JSON

PyJWT is a Python implementation of RFC 7519. PyJWT supports multiple different JWT signing algorithms. With JWT, an attacker submitting the JWT token can choose the used signing algorithm. The PyJWT library requires that the application chooses what algorithms are supported. The application can specify jwt.algorithms.get_default_algorithms() to get support for all algorithms, or specify a single algorithm. The issue is not that big as algorithms=jwt.algorithms.get_default_algorithms() has to be used. Users should upgrade to v2.4.0 to receive a patch for this issue. As a workaround, always be explicit with the algorithms that are accepted and expected when decoding.

CNA Affected

[
  {
    "product": "pyjwt",
    "vendor": "jpadilla",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.5.0, < 2.4.0"
      }
    ]
  }
]