jupyterhub/ltiauthenticator · Security
LTI JupyterHub Authenticator does not properly validate JWT Signature
- GHSA ID
- GHSA-mcgx-2gcr-p3hp
- CVE ID
- CVE-2023-25574
- Severity
- critical
- Published
- Updated
- CVSS
- 10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CVSS v3
- 10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Description
Impact
Only users that has configured a JupyterHub installation to use the authenticator class LTI13Authenticator are influenced.
LTI13Authenticator that was introduced in jupyterhub-ltiauthenticator 1.3.0 wasn't validating JWT signatures. This is believed to allow the LTI13Authenticator to authorize a forged request granting access to existing and new user identities.
Patches
None.
Workarounds
None.
References
- This code segment didn't validate a JWT signature.
CWEs
- CWE-347 · Improper Verification of Cryptographic Signature
References
- https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-mcgx-2gcr-p3hp ↗
- https://nvd.nist.gov/vuln/detail/CVE-2023-25574 ↗
- https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164 ↗
- https://github.com/jupyterhub/ltiauthenticator/blob/main/CHANGELOG.md#140---2023-03-01 ↗
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-ltiauthenticator/PYSEC-2025-120.yaml ↗
- https://github.com/advisories/GHSA-mcgx-2gcr-p3hp ↗