CVE-2009-1408 in webSPELL
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in webSPELL 4.2.0c allows remote attackers to inject arbitrary web script or HTML allows remote attackers to inject arbitrary web script or HTML via Javascript events such as onmouseover in nested BBcode tags, as demonstrated using (1) email, (2) img, and (3) url tags.
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Analysis
by VulDB Data Team • 11/27/2024
The CVE-2009-1408 vulnerability represents a critical cross-site scripting flaw in webSPELL version 4.2.0c that fundamentally undermines the security of web applications relying on this content management system. This vulnerability specifically targets the BBcode parsing functionality within the application, creating a pathway for remote attackers to execute malicious scripts in the context of other users' browsers. The flaw demonstrates the dangerous intersection of user input processing and HTML rendering, where properly formed BBcode tags containing malicious JavaScript events can be exploited to compromise user sessions and execute unauthorized actions.
The technical implementation of this vulnerability stems from inadequate input sanitization within the BBcode processing engine. When webSPELL processes BBcode tags such as email, img, and url, it fails to properly escape or validate JavaScript event handlers that may be embedded within these tags. Attackers can leverage this weakness by crafting malicious BBcode content that includes events like onmouseover, onclick, or other DOM-based JavaScript handlers. These events are typically triggered when users interact with the affected content, making the exploitation particularly insidious as it requires only the victim to view the maliciously crafted content rather than actively engage with it. The vulnerability specifically affects nested BBcode structures where one tag contains another, creating complex attack vectors that bypass simple input filtering mechanisms.
The operational impact of this vulnerability extends far beyond simple script execution, as it can enable sophisticated attack chains that compromise user accounts and facilitate further exploitation. An attacker could craft malicious posts containing embedded JavaScript that steals session cookies, redirects users to phishing sites, or injects additional malicious content into the application. The attack surface is particularly broad since email, img, and url BBcode tags are commonly used throughout web applications, making the exploitation vector highly accessible. This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates how improper input validation and output encoding can create persistent security weaknesses that affect multiple application components simultaneously.
Mitigation strategies for CVE-2009-1408 require comprehensive input validation and output encoding implementations that address the root cause of the vulnerability. Organizations should implement strict sanitization of all BBcode inputs, ensuring that JavaScript event handlers are stripped from all user-generated content before rendering. The recommended approach involves employing a whitelist-based validation system that only permits known-safe attributes and values within BBcode tags, rather than attempting to blacklist potentially dangerous content. Additionally, implementing proper HTML escaping mechanisms for all dynamic content insertion and adopting Content Security Policy (CSP) headers can provide additional defense-in-depth layers. The vulnerability also highlights the importance of regular security updates and the need for security-conscious development practices, as outlined in the ATT&CK framework's defense evasion techniques. Organizations should prioritize immediate patching of affected webSPELL installations and implement automated monitoring for similar vulnerabilities in other CMS components to prevent exploitation of related weaknesses.