Unauthorized Image Preview Access in Wagtail CMS

Executive Summary

This vulnerability exists in Wagtail, an open source content management system built on Django. In versions prior to 7.0.8, 7.3.3, and 7.4.2, there is a missing permission check on the image preview endpoint. This means that a user who has access to the Wagtail admin interface can preview any image, even those they might not normally have permission to view. However, the actual data of the image object is not exposed through this vulnerability. Ordinary site visitors without admin access cannot exploit this issue.

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Detection Guidance

This vulnerability affects Wagtail versions prior to 7.0.8, 7.3.3, and 7.4.2 and involves improper permission handling on the image preview endpoint accessible via the Wagtail admin interface.

To detect if your system is vulnerable, first verify the Wagtail version running on your system. If it is an affected version, you can check if the image preview endpoint allows access without proper permission checks.

Since the vulnerability requires access to the Wagtail admin interface, detection commands would involve:

• Checking the Wagtail version, for example by running: `pip show wagtail` or inspecting your application's dependencies.
• Attempting to access the image preview endpoint via the admin interface and verifying if images can be previewed without proper permissions.

No specific network scanning commands or automated detection commands are provided in the available resources.

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Impact Analysis

The impact of this vulnerability is that a user with Wagtail admin access can preview any image without proper permission checks. This could lead to unauthorized viewing of images within the system, potentially exposing sensitive or private images to users who should not have access to them. However, since the actual image data is not exposed and ordinary site visitors cannot exploit this, the impact is limited to users with admin privileges.

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Compliance Impact

The vulnerability allows a user with access to the Wagtail admin to preview any image due to a missing permission check on the image preview endpoint. However, the existing data of the image object itself is not exposed, and the vulnerability is not exploitable by ordinary site visitors without admin access.

There is no specific information provided about how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Wagtail to one of the fixed versions: 7.0.8, 7.3.3, or 7.4.2.

Additionally, ensure that only trusted users have access to the Wagtail admin interface, as the vulnerability requires admin access to be exploitable.

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