CVE-2011-0509 in Vaadin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Vaadin before 6.4.9 allows remote attackers to inject arbitrary web script or HTML via unknown vectors related to the index page.
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Analysis
by VulDB Data Team • 10/13/2021
The vulnerability identified as CVE-2011-0509 represents a critical cross-site scripting flaw within the Vaadin web framework version 6.4.8 and earlier. This vulnerability specifically affects the framework's handling of the index page, creating an attack surface that remote adversaries can exploit to execute malicious scripts in the context of affected applications. The flaw stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before rendering it within the web interface. Vaadin is a popular Java-based web application framework that enables developers to build rich internet applications with minimal client-side code, making this vulnerability particularly concerning as it affects the foundational security of applications built using this technology.
The technical nature of this vulnerability aligns with CWE-79, which classifies cross-site scripting flaws as weaknesses in web applications that allow attackers to inject malicious scripts into web pages viewed by other users. The vulnerability occurs in the index page processing logic where user-controllable parameters or content are not properly escaped or validated before being rendered in the browser context. Attackers can leverage this weakness by crafting malicious payloads that when processed by the vulnerable Vaadin application, get executed in the browsers of unsuspecting users. This typically involves injecting javascript code or html elements that can perform actions such as stealing session cookies, redirecting users to malicious sites, or defacing web pages. The remote nature of the attack means that exploitation does not require any local privileges or physical access to the target system, making it particularly dangerous in web environments.
The operational impact of CVE-2011-0509 extends beyond simple script execution as it fundamentally compromises the integrity and confidentiality of web applications built on the affected Vaadin versions. When exploited successfully, this vulnerability can lead to session hijacking attacks where attackers gain unauthorized access to user accounts, data theft, and potential complete system compromise depending on the privileges of the affected users. The vulnerability affects any application that relies on Vaadin's index page functionality and has implications for enterprise applications that handle sensitive data. Organizations using vulnerable versions of Vaadin face significant risk of data breaches, regulatory compliance violations, and reputational damage. The attack vector is particularly insidious because it can be delivered through various means including email attachments, malicious links, or compromised websites that redirect users to vulnerable applications.
Mitigation strategies for this vulnerability center around immediate patching and updating to Vaadin version 6.4.9 or later, which contains the necessary fixes for the XSS vulnerability. Organizations should implement comprehensive security scanning procedures to identify all instances of vulnerable Vaadin applications within their infrastructure. Additional defensive measures include implementing proper input validation at multiple layers of the application architecture, deploying web application firewalls to detect and block malicious payloads, and establishing secure coding practices that enforce output encoding for all dynamic content. The remediation process should also include thorough security testing of web applications, including penetration testing and code reviews focused on input validation and output encoding. From an ATT&CK framework perspective, this vulnerability maps to techniques involving command and control through web interfaces and credential access via session hijacking, making it a critical target for defensive security operations. Organizations should also consider implementing security monitoring solutions that can detect anomalous behavior patterns consistent with XSS exploitation attempts.