CVE-2009-4976 in kwebkitpart
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in webkitpart.cpp in kwebkitpart allows remote attackers to inject arbitrary web script or HTML via a URL associated with a nonexistent domain name, related to a "universal XSS" issue, a similar vulnerability to CVE-2010-2536.
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Analysis
by VulDB Data Team • 02/06/2019
The vulnerability described in CVE-2009-4976 represents a critical cross-site scripting flaw within the kwebkitpart component of the KDE web browser engine. This issue specifically resides in the webkitpart.cpp file and demonstrates how improperly handled URL parsing can lead to severe security implications. The vulnerability operates through a universal XSS mechanism that allows attackers to execute malicious scripts in the context of the victim's browser session, making it particularly dangerous for web applications that rely on this component for rendering web content.
The technical implementation of this vulnerability stems from the kwebkitpart library's inadequate handling of malformed URLs, particularly those containing nonexistent domain names. When a user encounters a URL that references a non-existent domain, the webkitpart component fails to properly sanitize or validate the input before rendering it within the browser interface. This processing gap creates an injection point where attackers can embed malicious JavaScript code or HTML content that gets executed when the page loads. The flaw essentially allows for the execution of arbitrary code in the context of the victim's browsing session, bypassing standard security mechanisms.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to perform a wide range of malicious activities including session hijacking, credential theft, data exfiltration, and redirection to malicious sites. The universal nature of this XSS vulnerability means it affects multiple applications that utilize the kwebkitpart component, creating a widespread attack surface across various KDE-based applications and web browsers. This characteristic significantly amplifies the potential damage, as a single vulnerability can compromise numerous systems that depend on the affected web engine component.
Security professionals should consider this vulnerability in the context of CWE-79 which specifically addresses cross-site scripting flaws, and the broader ATT&CK framework category T1059 for execution through scripting. The vulnerability demonstrates the importance of proper input validation and sanitization in web components, particularly those handling user-supplied URLs. Organizations using affected KDE applications should implement immediate mitigations including URL validation, content security policy enforcement, and regular updates to patched versions of the kwebkitpart library. Additionally, network-level protections such as web application firewalls and browser security extensions can provide additional defense-in-depth measures against exploitation attempts.
The similarity to CVE-2010-2536 indicates this represents a class of vulnerabilities in web engine URL handling that requires comprehensive review of all URL parsing mechanisms. This vulnerability type highlights the critical need for robust input validation in web rendering components and demonstrates how seemingly benign URL processing can become a security risk when proper sanitization is omitted. System administrators should prioritize patching affected systems and implementing monitoring for suspicious URL patterns that might indicate exploitation attempts.