critical10.0
CVE-2023-25574
LTI JupyterHub Authenticator does not properly validate JWT Signature
Impact
### 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](https://github.com/jupyterhub/ltiauthenticator/blob/3feec2e81b9d3b0ad6b58ab4226af640833039f3/ltiauthenticator/lti13/validator.py#L122-L164) didn't validate a JWT signature.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | jupyterhub-ltiauthenticator | = 1.3.0 | 1.4.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Jupyter | Lti Jupyterhub Authenticator | Version 1.3.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- 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/jupyterhub/ltiauthenticator/security/advisories/GHSA-mcgx-2gcr-p3hp
- https://github.com/advisories/GHSA-mcgx-2gcr-p3hp
- https://nvd.nist.gov/vuln/detail/CVE-2023-25574
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyterhub-ltiauthenticator/PYSEC-2025-120.yaml