CVE-2017-11424

Description

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.

Risk Information

Base Score

7.5

MODERATE

Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Score

Exploitation Probability

1.296

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2017-11424 are fixed in Python-pyjwt 1.5.1	Windows
Python implementation of JSON Web Token (USN-3407-1) python-jwt_1.3.0-1ubuntu0.1_all.deb	Linux
Python implementation of JSON Web Token (USN-3407-1) python-jwt_1.4.2-1ubuntu0.1_all.deb	Linux
Python implementation of JSON Web Token (USN-3407-1) python3-jwt_1.3.0-1ubuntu0.1_all.deb	Linux
Python implementation of JSON Web Token (USN-3407-1) python3-jwt_1.4.2-1ubuntu0.1_all.deb	Linux
Vulnerabilities CVE-2017-11424 are fixed in Python-pyjwt for linux 1.5.1	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234