Executive Summary

This vulnerability exists in the givanz Vvvebjs software up to version 2.0.5, specifically in the file upload.php component responsible for handling file uploads.

The issue arises from manipulation of the argument uploadAllowExtensions, which leads to a cross-site scripting (XSS) vulnerability. This means an attacker can inject malicious scripts through the file upload functionality.

Remote exploitation is possible, allowing attackers to execute scripts in the context of the victim's browser.

A patch has been released that removes the 'svg' file extension from the allowed upload types to mitigate this risk, as SVG files can contain malicious scripts.

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Impact Analysis

This vulnerability can allow attackers to perform cross-site scripting (XSS) attacks by uploading malicious SVG files.

Such attacks can lead to unauthorized script execution in users' browsers, potentially resulting in session hijacking, defacement, or theft of sensitive information.

Because the exploit is publicly available, the risk of attack is increased if the vulnerable version is used without applying the patch.

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Detection Guidance

This vulnerability involves the upload.php file allowing SVG file uploads, which can lead to cross site scripting attacks. Detection can focus on monitoring or scanning for SVG file uploads through the file upload endpoint.

You can check your system for the presence of SVG files being uploaded by inspecting web server logs or by searching the upload directories for SVG files.

• Use command to find SVG files in upload directories: find /path/to/uploads -type f -name '*.svg'
• Check web server access logs for POST requests to upload.php that include SVG files: grep 'upload.php' /var/log/apache2/access.log | grep '.svg'
• Use network monitoring tools to detect HTTP POST requests containing SVG files to the upload endpoint.

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Mitigation Strategies

The recommended immediate mitigation is to apply the patch identified by commit 8cac22cff99b8bc701c408aa8e887fa702755336, which removes 'svg' from the allowed file extensions in upload.php.

This patch prevents SVG file uploads that could be exploited for cross site scripting attacks.

If patching immediately is not possible, temporarily disable or restrict file uploads to exclude SVG files.

Additionally, monitor and block suspicious upload attempts and consider implementing input validation and sanitization on uploaded files.

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Compliance Impact

The vulnerability in givanz Vvvebjs allows cross site scripting (XSS) via manipulation of the uploadAllowExtensions argument in the file upload.php component. Such XSS vulnerabilities can potentially lead to unauthorized access or manipulation of user data.

While the provided context does not explicitly mention compliance with standards like GDPR or HIPAA, XSS vulnerabilities generally pose risks to data confidentiality and integrity, which are critical aspects of these regulations.

Therefore, if exploited, this vulnerability could impact compliance by exposing personal or sensitive data to unauthorized parties, violating data protection requirements.

Applying the recommended patch mitigates this risk and helps maintain compliance with such standards.

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