Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyter_server/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the Referer contains a token-bearing URL can therefore write that token to server logs in plaintext.
An attacker who can read those logs can recover the token and use the affected user's Jupyter Server permissions. This issue is fixed in version 2.21.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
jupyter-server:jupyter_server
References 4
https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-c3mw-…
https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-c3mw-737p-c7g2
https://github.com/jupyter-server/jupyter_server/pull/1681
https://github.com/jupyter-server/jupyter_server/pull/1681
https://github.com/jupyter-server/jupyter_server/commit/52513529af7096e622c0091…
https://github.com/jupyter-server/jupyter_server/commit/52513529af7096e622c00911b17627b266294717
https://github.com/jupyter-server/jupyter_server/releases/tag/v2.21.0
https://github.com/jupyter-server/jupyter_server/releases/tag/v2.21.0