Possible cross-site scripting attack via unsanitized SVG files in FoF Upload
High severity
GitHub Reviewed
Published
May 25, 2022
in
FriendsOfFlarum/upload
•
Updated Jan 27, 2023
Description
Published to the GitHub Advisory Database
May 25, 2022
Reviewed
May 25, 2022
Published by the National Vulnerability Database
Jun 2, 2022
Last updated
Jan 27, 2023
Credits
-
Caesar302 Analyst
Impact
If FoF Upload is configured to allow the uploading of SVG files (
image/svg+xml), navigating directly to an SVG file URI could execute arbitrary Javascript code decided by an attacker.This Javascript code could include the execution of HTTP web requests to Flarum, or any other web service. This could allow data to be leaked by an authenticated Flarum user, or, possibly, for data to be modified maliciously.
Patches
This has been patched with v1.2.3, which now sanitizes uploaded SVG files.
Workarounds
Upgrade to
1.2.3(requires Flarum 1.2 or later), or remove the ability for users to upload SVG files through FoF Upload.References
Thank you to Safwat Refaat for the responsible disclosure of this vulnerability.
References