Executive Summary

This vulnerability affects Lumiverse, an AI chat application, prior to version 0.9.7. The issue lies in the component override system, which transpiles user-supplied TSX code and evaluates it in a sandboxed environment that attempts to block dangerous globals like fetch, window, and eval by shadowing them with undefined and using a static source validator to block these identifiers.

However, both protections can be bypassed. Attackers can reconstruct blocked identifiers at runtime by splitting strings (e.g., 'ownerDoc' + 'ument'), bypassing the static validator. Additionally, the sandbox can be escaped by using React hooks like useRef and useEffect to obtain a live DOM node reference, from which the real window object can be accessed, bypassing all shadows.

Malicious theme packs (.lumitheme or .lumiverse-theme) serve as the exploit vector. When a victim imports such a pack and enables a component override in the Theme Editor, the malicious payload executes in their authenticated session. This vulnerability was fixed in version 0.9.7.

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Impact Analysis

This vulnerability can have severe impacts because it allows an attacker to execute arbitrary code within the context of an authenticated user's session in Lumiverse.

• Complete compromise of user session and data confidentiality.
• Potential unauthorized access to sensitive information accessible through the application.
• Execution of malicious code that could manipulate or steal data, or perform actions on behalf of the user.
• Since the exploit uses theme packs, it can be delivered via social engineering or malicious content sharing.

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Mitigation Strategies

To mitigate this vulnerability, upgrade Lumiverse to version 0.9.7 or later, where the issue is fixed.

Avoid importing or enabling untrusted theme packs (.lumitheme or .lumiverse-theme) that could contain malicious component overrides.

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Compliance Impact

This vulnerability allows full in-browser code execution within the Lumiverse origin, including automatic use of HttpOnly session cookies in same-origin requests. This can lead to unauthorized access to user data and session hijacking, severely impacting confidentiality and integrity of data.

Such unauthorized access and potential data breaches could result in non-compliance with data protection regulations like GDPR and HIPAA, which require strict controls over personal and sensitive information to prevent unauthorized disclosure or modification.

Therefore, exploitation of this vulnerability could lead to violations of these standards due to compromised confidentiality and integrity of user data.

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Detection Guidance

Detection of this vulnerability involves identifying the presence of vulnerable Lumiverse versions (prior to 0.9.7) and suspicious activity related to malicious theme packs (.lumiverse-theme files) being imported and enabled in the Theme Editor.

Since the exploit involves execution of user-supplied TSX code with sandbox escape techniques, monitoring for unusual or unauthorized theme pack imports and component overrides in Lumiverse is critical.

On the system or network, you can check the installed Lumiverse version to confirm if it is vulnerable:

• Check Lumiverse version installed (example command):
• lumiverse --version

To detect suspicious theme pack files, you can search for .lumiverse-theme files on the system:

• find /path/to/lumiverse/data -name '*.lumiverse-theme'

Network detection could involve monitoring HTTP requests for uploads or imports of .lumiverse-theme files or unusual API calls related to the Theme Editor.

Since the vulnerability requires user interaction to enable a malicious component override, monitoring user actions in the Theme Editor for enabling overrides could also help detect exploitation attempts.

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