Compliance Impact

This vulnerability allows an attacker to craft URLs that appear to be local but redirect users to attacker-controlled external sites, potentially enabling phishing, credential theft, or social engineering attacks.

Such attacks could lead to unauthorized access to sensitive information or user credentials, which may result in non-compliance with data protection regulations like GDPR or HIPAA that require safeguarding personal and sensitive data.

However, the provided information does not explicitly state the direct impact on compliance with these standards.

Useful 0 Not Useful 0

Executive Summary

This vulnerability is a URL validation flaw in the MISP dashboard button widget. It allowed specially crafted URLs that looked like local paths but were interpreted by browsers as external URLs. The validation incorrectly accepted paths starting with a slash followed by a backslash (e.g., /\example.com), which some browsers normalize into external navigation targets. This flaw enabled attackers who could configure dashboard button URLs to create buttons that appeared to link inside the application but actually redirected users to attacker-controlled sites.

The vulnerability arises because the validation rejected URLs with explicit schemes, hosts, or user components but did not properly reject certain malformed paths. Additionally, the generated link concatenated the reconstructed URL with the original URL, increasing the chance of unsafe or malformed links.

Useful 0 Not Useful 0

Impact Analysis

An attacker who can influence or configure a dashboard button URL could exploit this vulnerability to craft a button that appears to link within the application but actually redirects users to a malicious external site.

• Phishing attacks by redirecting users to fake login or credential collection pages.
• Credential theft by tricking users into entering sensitive information on attacker-controlled sites.
• Social engineering attacks leveraging the trust users place in the application interface.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability involves crafted relative-looking URLs in the MISP dashboard button widget that appear local but redirect to external attacker-controlled sites. Detection involves inspecting dashboard button URLs for suspicious patterns such as paths starting with a slash followed by a backslash (e.g., /\example.com) or malformed URLs that could be interpreted as external links.

You can detect potential exploitation by reviewing the URLs configured in dashboard buttons for these patterns. Since this is a web application issue, commands to extract and analyze these URLs might include searching the MISP database or configuration files for button URLs containing suspicious sequences.

• Use grep or similar tools to search for URLs starting with '/\' in MISP configuration or database exports.
• Example command: grep -r '\/\\' /path/to/misp/config_or_exports
• Review logs or HTTP traffic for unexpected redirects or external URL requests originating from dashboard button clicks.

Useful 0 Not Useful 0

Mitigation Strategies

The immediate mitigation is to apply the patch that fixes the URL validation flaw in the MISP dashboard button widget. This patch rejects empty paths and paths starting with a slash followed by a backslash, and ensures only properly validated URLs are used in the href attribute.

Until the patch is applied, avoid configuring or allowing dashboard buttons with URLs that could be crafted to exploit this vulnerability.

• Update MISP to the version including the fix from commit f879f16fb5db7a9aab0a70fdcafea12ce4847e9a.
• Audit existing dashboard button URLs and remove or correct any that contain suspicious patterns such as paths starting with '/\'.
• Educate users to avoid clicking on dashboard buttons with unexpected or suspicious URLs.

Useful 0 Not Useful 0