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

7.4HIGH

Key Information:

Vendor

Jpadilla

Status
Pyjwt
Vendor
CVE Published:
24 May 2022

What is CVE-2022-29217?

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.

Affected Version(s)

pyjwt >= 1.5.0, < 2.4.0

References

https://github.com/jpadilla/pyjwt/security/advisories/GHS...
x_refsource_CONFIRM
https://github.com/jpadilla/pyjwt/commit/9c528670c455b8d9...
x_refsource_MISC
https://github.com/jpadilla/pyjwt/releases/tag/2.4.0
x_refsource_MISC

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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