CVE-2006-4106 in blur6ex
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in blursoft blur6ex 0.3 allows remote attackers to inject arbitrary web script or HTML via a comment title.
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Analysis
by VulDB Data Team • 08/02/2018
The vulnerability identified as CVE-2006-4106 represents a classic cross-site scripting flaw within the blursoft blur6ex 0.3 web application. This security weakness resides in the application's handling of user-supplied input, specifically in the comment title field where insufficient input validation and output sanitization mechanisms fail to properly filter malicious content. The vulnerability classifies under CWE-79 which defines improper neutralization of input during web page generation, making it a fundamental web application security issue that has persisted across numerous systems and frameworks since the early days of web development. The affected software demonstrates poor input validation practices where user-entered data flows directly into the application's output without adequate sanitization, creating an exploitable pathway for malicious actors.
The technical exploitation of this vulnerability occurs when remote attackers craft malicious input containing script code within the comment title field. When this malformed input is processed and displayed on web pages, the embedded scripts execute within the context of other users' browsers who view the affected content. This type of XSS vulnerability falls under the category of stored XSS since the malicious script is permanently stored on the server and executed whenever the compromised page is accessed. The flaw essentially allows attackers to inject arbitrary web scripts or HTML code that can manipulate the victim's browser behavior, potentially stealing session cookies, redirecting users to malicious sites, or performing unauthorized actions on behalf of authenticated users.
The operational impact of this vulnerability extends beyond simple data corruption or display issues, as it fundamentally compromises the security of the entire web application ecosystem. Users who view pages containing malicious comments become unwitting participants in the attack, with their browsers executing the injected code as if it were legitimate application functionality. This creates a persistent threat vector that can be leveraged for session hijacking, credential theft, and further exploitation of the web application. The vulnerability also undermines user trust in the application and can lead to reputational damage, regulatory compliance issues, and potential legal consequences for organizations that fail to address such security flaws. According to ATT&CK framework, this vulnerability maps to T1531 which covers "Modify Existing Service" and T1059.007 which addresses "Command and Scripting Interpreter: JavaScript", highlighting the attack surface and execution methods available to adversaries.
Mitigation strategies for CVE-2006-4106 must focus on implementing robust input validation and output encoding mechanisms throughout the application's data flow. The most effective approach involves sanitizing all user-supplied input before processing and ensuring that any output rendered to web pages properly encodes potentially dangerous characters using context-appropriate encoding schemes such as HTML entity encoding. Organizations should implement Content Security Policy headers to limit script execution capabilities and employ web application firewalls to detect and block suspicious input patterns. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities across the application stack, while developers must follow secure coding practices that emphasize input validation and output sanitization. Additionally, implementing proper access controls and monitoring mechanisms can help detect unauthorized modifications to application data, providing early warning of potential exploitation attempts. The remediation process should also include thorough testing of the patched application to ensure that legitimate functionality remains intact while eliminating the security vulnerability.