Reflected XSS in Wagtail Admin Dynamic Image URL

Executive Summary

This vulnerability is a reflected cross-site scripting (XSS) issue found in the Wagtail content management system versions prior to 7.0.8, 7.3.3, and 7.4.2. It exists in the dynamic image URL generator view within the Wagtail admin interface. A user with limited editor permissions can craft a malicious URL that, when accessed by a user with higher privileges, can execute actions using that higher privileged user's credentials.

The vulnerability affects all sites using the vulnerable versions, even if they do not enable the dynamic image serve view. However, it cannot be exploited by ordinary site visitors without access to the Wagtail admin interface.

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Detection Guidance

The vulnerability is a reflected cross-site scripting (XSS) issue in the dynamic image URL generator view of the Wagtail admin interface. Detection involves identifying crafted URLs targeting this specific view that could execute arbitrary scripts when accessed by a higher-privileged user.

Since the vulnerability requires admin interface access and crafted URLs, detection can focus on monitoring HTTP requests to the Wagtail admin dynamic image URL generator endpoints for suspicious or unusual query parameters or URL patterns.

No specific commands are provided in the available resources. However, general detection approaches could include:

• Using web server logs or proxy logs to search for unusual or suspicious URL patterns targeting the dynamic image URL generator view.
• Employing web application firewall (WAF) rules to detect and block reflected XSS payloads in URLs accessing the Wagtail admin interface.
• Manually reviewing URLs accessed by users with editor or higher privileges for unexpected parameters or script injections.

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Impact Analysis

This vulnerability can allow an attacker with limited permissions to perform actions with the credentials of a higher privileged user if that user views a specially crafted URL. This can lead to unauthorized actions within the Wagtail admin interface, potentially compromising the integrity and security of the content management system.

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Compliance Impact

The vulnerability allows a user with limited permissions to craft a URL that, when viewed by a higher-privileged user, could perform actions with that user's credentials. This could lead to unauthorized access or actions within the Wagtail admin interface.

Such unauthorized actions and potential exposure of privileged credentials could impact compliance with standards and regulations like GDPR and HIPAA, which require protection of sensitive data and prevention of unauthorized access.

However, the vulnerability is not exploitable by ordinary site visitors without admin access, which somewhat limits the exposure.

The issue has been fixed in later versions, so updating to these versions is important to maintain compliance.

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Mitigation Strategies

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

Since the vulnerability affects the dynamic image URL generator view in the Wagtail admin interface, ensure that only trusted users have access to the Wagtail admin and limit editor permissions where possible until the upgrade is applied.

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