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Possible cross-site scripting attack via unsanitized SVG files in fof/upload

High
imorland published GHSA-fm53-mpmp-7qw2 May 25, 2022

Package

composer fof/upload (Composer)

Affected versions

< 1.2.3

Patched versions

1.2.3

Description

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.

Severity

High
8.7
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVE ID

CVE-2022-30999

Weaknesses

Credits