CVE-2022-29238

Jupyter Notebook is a web-based notebook environment for interactive computing. Prior to version 6.4.12, authenticated requests to the notebook server with `ContentsManager.allow_hidden = False` only prevented listing the contents of hidden directories, not accessing individual hidden files or files in hidden directories (i.e. hidden files were 'hidden' but not 'inaccessible'). This could lead to notebook configurations allowing authenticated access to files that may reasonably be expected to be disallowed. Because fully authenticated requests are required, this is of relatively low impact. But if a server's root directory contains sensitive files whose only protection from the server is being hidden (e.g. `~/.ssh` while serving $HOME), then any authenticated requests could access files if their names are guessable. Such contexts also necessarily have full access to the server and therefore execution permissions, which also generally grants access to all the same files. So this does not generally result in any privilege escalation or increase in information access, only an additional, unintended means by which the files could be accessed. Version 6.4.12 contains a patch for this issue. There are currently no known workarounds.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
jupyter-notebook	23.10 mantic	Not affected
	23.04 lunar	Ignored end of life, was needed
	22.10 kinetic	Ignored end of life, was needed
	22.04 LTS jammy	Fixed 6.4.8-1ubuntu0.1
	21.10 impish	Ignored end of life
	20.04 LTS focal	Fixed 6.0.3-2ubuntu0.1
	18.04 LTS bionic	Not affected

Notes

sbeattie

the allow-hidden feature was added in jupyter-notebook upstream commit 605eaa72b ("Added a flag to allow access of hidden files (#2819)") (version 5.3.0rc1), and as such, bionic's 5.2.x based version is not affected. Thanks to Luís Infante da Câmara for researching this.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
jupyter-notebook	Upstream: a161ffa

Severity score breakdown

Parameter	Value
Base score	4.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-5585-1
Jupyter Notebook vulnerabilities
30 August 2022