7.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-30167

CVE-2025-30167: Jupyter Core on Windows Has Uncontrolled Search Path Element Local Privilege Escalation Vulnerability

Jupyter Core is a package for the core common functionality of Jupyter projects. When using Jupyter Core prior to version 5.8.0 on Windows, the shared %PROGRAMDATA% directory is searched for configuration files (SYSTEM_CONFIG_PATH and SYSTEM_JUPYTER_PATH), which may allow users to create configuration files affecting other users. Only shared Windows systems with multiple users and unprotected %PROGRAMDATA% are affected. Users should upgrade to Jupyter Core version 5.8.0 or later to receive a patch. Some other mitigations are available. As administrator, modify the permissions on the %PROGRAMDATA% directory so it is not writable by unauthorized users; or as administrator, create the %PROGRAMDATA%\jupyter directory with appropriately restrictive permissions; or as user or administrator, set the %PROGRAMDATA% environment variable to a directory with appropriately restrictive permissions (e.g. controlled by administrators or the current user).

(GitHub Advisory)

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CVE-2025-30167

CVE-2025-30167:

7.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
jupyter_core	pip	< 5.8.0	5.8.1

Technical Details

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Root Cause Analysis

The vulnerability lies in Jupyter Core's handling of configuration file paths on Windows, specifically concerning the SYSTEM_CONFIG_PATH variable which can be derived from the %PROGRAMDATA% directory. If this directory has weak permissions, an attacker can place malicious configuration files that would be loaded by Jupyter processes, potentially leading to local privilege escalation. The function jupyter_core.paths.jupyter_config_path() is identified as the key vulnerable function because it assembles the list of search paths, including the potentially insecure SYSTEM_CONFIG_PATH. The provided patch (commit 0d225fda61f0edff01d1dfa826764482070dd8c3) modifies the logic in jupyter_core/paths.py to ensure that SYSTEM_CONFIG_PATH defaults to more secure alternatives (like ENV_CONFIG_PATH, which is typically sys.prefix/etc/jupyter) when the safety of using %PROGRAMDATA% cannot be guaranteed (e.g., when _use_programdata is false, or _win_programdata is not set). This change prevents jupyter_config_path() from returning a path list that includes an easily exploitable shared directory by default under vulnerable conditions. Any process using jupyter_config_path() to locate configuration files would have been susceptible.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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