Stored XSS in MCO via Malicious SVG Logo Upload

Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the MCO application. It occurs through the application logo upload functionality, where an attacker who can change the logo uploads a specially crafted SVG file containing malicious JavaScript code. This code is then executed when the logo is rendered or opened.

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Detection Guidance

This vulnerability involves Stored Cross-Site Scripting (XSS) via the application logo upload functionality in MCO. Detection would involve checking if the application logo upload feature accepts and stores SVG files containing embedded JavaScript.

To detect this on your system, you can attempt to upload a crafted SVG file with embedded JavaScript to the logo upload functionality and then observe if the script executes when the logo is rendered.

Network detection might include monitoring HTTP requests to the logo upload endpoint for suspicious SVG file uploads or scanning stored logos for embedded scripts.

Specific commands are not provided in the available resources or context.

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Impact Analysis

The impact of this vulnerability is that an attacker with permission to change the application logo can execute malicious JavaScript code in the context of the application. This can lead to unauthorized actions, data theft, session hijacking, or other malicious activities when users view or interact with the logo.

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Compliance Impact

The vulnerability in MyComplianceOffice (MCO) involves Stored Cross-Site Scripting (XSS) via the application logo upload functionality, which could allow execution of malicious JavaScript code. While the CVE description and resources do not explicitly mention impacts on compliance with standards such as GDPR or HIPAA, such vulnerabilities generally pose risks to data integrity and security.

Given that MCO is a compliance management platform used to help organizations meet regulatory obligations, a security flaw like Stored XSS could undermine trust in the platform's ability to protect sensitive compliance data and user information. This could potentially lead to non-compliance with data protection regulations that require safeguarding against unauthorized code execution and data breaches.

However, no direct statements or analysis regarding the effect of this specific vulnerability on compliance with GDPR, HIPAA, or other standards are provided in the available information.

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Mitigation Strategies

Immediate mitigation steps include restricting or disabling the ability to upload or change the application logo until a patch or fix is available.

Additionally, validate and sanitize uploaded SVG files to ensure they do not contain executable JavaScript or other malicious content.

Implement Content Security Policy (CSP) headers to reduce the impact of any stored XSS by restricting script execution.

Monitor and audit logo uploads and user permissions to limit the risk of exploitation.

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