CVE-2006-3842 in Zoho Virtual Office
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Zoho Virtual Office 3.2 Build 3210 allows remote attackers to execute arbitrary web script or HTML via an HTML message.
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Analysis
by VulDB Data Team • 09/18/2017
The CVE-2006-3842 vulnerability represents a critical cross-site scripting flaw discovered in Zoho Virtual Office version 3.2 Build 3210, demonstrating a fundamental weakness in web application input validation and output encoding mechanisms. This vulnerability exists within the messaging functionality of the virtual office platform, where user-supplied HTML content is not properly sanitized before being rendered in web interfaces. The flaw enables remote attackers to inject malicious scripts into HTML messages that are subsequently executed in the browsers of other users who view these messages, creating a persistent vector for malicious activity within the application environment.
The technical nature of this vulnerability aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities where web applications fail to properly validate or encode user-controllable data before incorporating it into dynamically generated web pages. The vulnerability operates by exploiting the lack of proper input sanitization in the message handling system, allowing attackers to embed malicious HTML or JavaScript code within message content that gets executed in the context of other users' browsing sessions. This type of flaw typically occurs when applications directly incorporate user input into web responses without appropriate encoding or validation measures, creating an environment where attacker-controlled content can be interpreted as executable code by web browsers.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it enables attackers to establish persistent footholds within the Zoho Virtual Office environment. Once an attacker successfully injects malicious code through a crafted HTML message, they can potentially steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. The vulnerability particularly affects collaborative environments where users frequently exchange messages and documents, as the attack vector can be concealed within seemingly legitimate communications, making detection and prevention challenging for end users and administrators. This type of vulnerability is particularly dangerous in enterprise settings where sensitive business communications are exchanged, as it could facilitate data exfiltration or unauthorized access to corporate resources.
Mitigation strategies for CVE-2006-3842 should focus on implementing robust input validation and output encoding mechanisms throughout the application's message handling processes. Organizations should ensure that all user-supplied content is properly sanitized before being rendered in web interfaces, with special attention to HTML content that may contain script tags or other executable elements. The implementation of Content Security Policies (CSP) can provide additional protection by restricting the sources from which scripts can be loaded, while proper encoding of user input using techniques such as HTML entity encoding can prevent malicious code from being interpreted as executable content. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other parts of the application, and administrators should implement monitoring systems to detect unusual message content patterns that might indicate attempted exploitation. This vulnerability also highlights the importance of keeping web applications updated with the latest security patches, as the flaw was present in a specific build version that would have been addressed through subsequent releases. The ATT&CK framework categorizes this type of vulnerability under T1566, which covers the initial access techniques that involve exploiting vulnerabilities in web applications, emphasizing the need for comprehensive application security measures to prevent such entry points from being exploited by adversaries.