XSS in ttttonyhe OBlog via tags.php

Executive Summary

This vulnerability is a reflected Cross-Site Scripting (XSS) issue in OBlog up to version 3ca6a45a2fcc81f6086751d8af124658720e8f8f. It occurs in the tags.php file where the 'day' argument is manipulated to inject malicious scripts. The attack is performed remotely and requires user interaction.

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Detection Guidance

To detect this XSS vulnerability in OBlog, inspect the tags.php file for improper handling of the 'day' parameter. Check if user input is echoed directly into HTML responses without sanitization. Manually test by appending a payload like <script>alert(1)</script> to the URL parameter and observe if it executes.

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Impact Analysis

This vulnerability can lead to session hijacking, credential theft, CSRF bypass, website defacement, and phishing attacks. Attackers can execute arbitrary JavaScript in a victim's browser when they visit a specially crafted link.

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Mitigation Strategies

Immediately sanitize the 'day' parameter input in tags.php using functions like htmlspecialchars() or strip_tags(). Implement a Content Security Policy (CSP) to restrict inline scripts. Consider using a dedicated sanitization library for additional protection.

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