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CVE-2017-11424

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Date: August 24, 2017

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.

Language: Python

Severity Score

Related Resources (7)

https://github.com/jpadilla/pyjwt/pull/277
https://nvd.nist.gov/vuln/detail/CVE-2017-11424
https://github.com/pypa/advisory-database/tree/main/vulns/pyjwt/PYSEC-2017-24.yaml
https://github.com/jpadilla/pyjwt
http://www.debian.org/security/2017/dsa-3979
https://security-tracker.debian.org/tracker/CVE-2017-11424
https://www.mend.io/vulnerability-database/CVE-2017-11424

Severity Score

Weakness Type (CWE)

Improper Access Control

CWE-284

Insufficient Information

NVD-CWE-noinfo

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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