BaseFortify

Executive Summary

This vulnerability in Taguette versions 1.5.1 and below allows attackers to create malicious URLs that redirect users to arbitrary external websites after they authenticate. The application uses a user-controlled 'next' parameter directly in HTTP redirects without validating it, enabling attackers to perform phishing attacks by redirecting victims from a trusted Taguette instance to malicious sites designed to steal credentials or deliver malware.

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Impact Analysis

This vulnerability can lead to phishing attacks where users believe they are interacting with a legitimate Taguette instance but are redirected to malicious websites. This can result in stolen credentials or malware infections, potentially compromising user accounts and system security.

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Mitigation Strategies

Upgrade Taguette to version 1.5.2 or later, as this version contains the fix for the vulnerability involving unvalidated redirects via the next parameter.

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Compliance Impact

This vulnerability can lead to phishing attacks, credential theft, and malware distribution by redirecting users to malicious external sites after authentication. Such security incidents can result in unauthorized access to personal or sensitive data, potentially violating data protection regulations like GDPR and HIPAA that require safeguarding user data and ensuring secure authentication processes. Therefore, the presence of this vulnerability may negatively impact compliance with these standards by increasing the risk of data breaches and unauthorized data exposure. [2]

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Detection Guidance

This vulnerability can be detected by monitoring HTTP requests to the Taguette instance for URLs containing the 'next' parameter with external domains. For example, you can use network traffic inspection tools or web server logs to search for requests where the 'next' parameter points to an external URL. A simple command to search web server logs for such patterns could be: grep -E 'next=https?://[^/]' access.log. Additionally, you can test manually by attempting to access URLs like https://[your-taguette-instance]/login?next=https://malicious-site.com and observe if the redirect occurs after login or cookie acceptance. Detecting redirects to external sites after login or cookie acceptance indicates the presence of the vulnerability. [2]

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