CVE-2008-6631 in BlogPHP
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in index.php in BlogPHP 2.0 allow remote attackers to inject arbitrary web script or HTML via the (1) user parameter in a sendmessage action and the (2) username parameter when registering a new user, different vectors than CVE-2008-0679.
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Analysis
by VulDB Data Team • 04/02/2025
The vulnerability identified as CVE-2008-6631 represents a critical cross-site scripting flaw in BlogPHP 2.0's index.php script that exposes multiple attack vectors for remote threat actors. This vulnerability specifically targets the application's handling of user input through two distinct parameters during different user interaction scenarios. The first vector occurs when the user parameter is submitted through a sendmessage action, while the second vector manifests during user registration when the username parameter is processed. These vulnerabilities fall under the category of persistent XSS attacks as they allow attackers to inject malicious scripts that can execute in the context of other users' browsers when they view affected content.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the BlogPHP 2.0 application. When the application processes the user parameter during sendmessage operations or the username parameter during registration, it fails to properly sanitize or encode user-supplied data before incorporating it into dynamic web page content. This lack of proper input filtering creates opportunities for attackers to inject malicious HTML or JavaScript code that gets executed in the victim's browser context. The vulnerability is particularly concerning because it affects core user interaction functionalities, meaning that any user who submits data through these pathways can become a vector for XSS attacks.
From an operational impact perspective, this vulnerability enables attackers to execute arbitrary web scripts in the browsers of other users who interact with the affected BlogPHP installation. The consequences extend beyond simple script execution to include potential session hijacking, credential theft, and the ability to perform actions on behalf of users. Attackers could leverage these XSS vulnerabilities to steal session cookies, redirect users to malicious websites, deface the blog content, or even inject malware delivery mechanisms. The persistent nature of these vulnerabilities means that once exploited, malicious scripts can continue to affect users until the application is patched or the malicious content is removed from the system.
Security professionals should recognize this vulnerability as a classic example of CWE-79 Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that has been documented in numerous security frameworks and standards. The attack patterns associated with this vulnerability align with the techniques described in the MITRE ATT&CK framework under the T1566 Initial Access category, specifically targeting web application vulnerabilities for unauthorized access. Organizations should implement comprehensive input validation measures including proper HTML encoding, strict parameter validation, and output escaping mechanisms to prevent such vulnerabilities from being exploited. Additionally, regular security assessments and code reviews should be conducted to identify similar input sanitization gaps that could lead to comparable security risks in web applications.
The remediation approach for this vulnerability requires immediate patching of the BlogPHP 2.0 application to ensure proper input sanitization and output encoding of user parameters. System administrators should implement proper parameter validation that rejects or sanitizes potentially malicious input before it is processed or stored in the application's database. The solution must address both the sendmessage action's user parameter handling and the user registration's username parameter processing. Organizations should also consider implementing web application firewalls that can detect and block suspicious input patterns, as well as conducting thorough security testing including dynamic application security testing to identify similar vulnerabilities in other web applications within the organization's infrastructure.