CVE-2023-50263: Nautobot allows unauthenticated db-file-storage views
Impact
In Nautobot 1.x and 2.0.x, the URLs /files/get/?name=... and /files/download/?name=... are used to provide admin access to files that have been uploaded as part of a run request for a Job that has FileVar inputs. Under normal operation these files are ephemeral and are deleted once the Job in question runs.
It was reported by @kircheneer that in the default implementation used in Nautobot, as provided by django-db-file-storage, these URLs do not by default require any user authentication to access; they should instead be restricted to only users who have permissions to view Nautobot's FileProxy model instances.
Note that no URL mechanism is provided for listing or traversal of the available file name values, so in practice an unauthenticated user would have to guess names to discover arbitrary files for download, but if a user knows the file name/path value, they can access it without authenticating, so we are considering this a vulnerability.
Patches
Fixes will be included in Nautobot 1.6.7 and Nautobot 2.0.6.
Workarounds
No workaround other than applying the patches included in https://github.com/nautobot/nautobot/pull/4959/files (2.0.x) or https://github.com/nautobot/nautobot/pull/4964/files (1.6.x)
References
- https://github.com/victor-o-silva/dbfilestorage/blob/master/dbfilestorage/views.py
Other sources
Nautobot is a Network Source of Truth and Network Automation Platform built as a web application atop the Django Python framework with a PostgreSQL or MySQL database. In Nautobot 1.x and 2.0.x prior to 1.6.7 and 2.0.6, the URLs /files/get/?name=... and /files/download/?name=... are used to provide admin access to files that have been uploaded as part of a run request for a Job that has FileVar inputs. Under normal operation these files are ephemeral and are deleted once the Job in question runs.
In the default implementation used in Nautobot, as provided by django-db-file-storage, these URLs do not by default require any user authentication to access; they should instead be restricted to only users who have permissions to view Nautobot's FileProxy model instances.
Note that no URL mechanism is provided for listing or traversal of the available file name values, so in practice an unauthenticated user would have to guess names to discover arbitrary files for download, but if a user knows the file name/path value, they can access it without authenticating, so we are considering this a vulnerability.
Fixes are included in Nautobot 1.6.7 and Nautobot 2.0.6. No known workarounds are available other than applying the patches included in those versions.
Affected Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2023-50263?
CVE-2023-50263 is classified as a medium severity vulnerability.
How do I fix CVE-2023-50263?
To mitigate CVE-2023-50263, upgrade Nautobot to version 1.6.7 or 2.0.6 or later.
What systems are affected by CVE-2023-50263?
CVE-2023-50263 affects Nautobot versions from 1.1.0 to 1.6.6 and from 2.0.0 to 2.0.5.
What types of files are impacted by CVE-2023-50263?
CVE-2023-50263 relates to uploaded files associated with run requests for jobs with FileVar inputs.
Is CVE-2023-50263 a remote code execution vulnerability?
CVE-2023-50263 does not directly allow remote code execution but can expose sensitive files to unauthorized access.