CVE-2006-6228 in ltwCalendar
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Codewalkers ltwCalendar (aka PHP Event Calendar) before 4.2.1 allows remote attackers to inject arbitrary HTML or web script via unknown vectors.
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Analysis
by VulDB Data Team • 08/09/2018
The CVE-2006-6228 vulnerability represents a critical cross-site scripting flaw discovered in the Codewalkers ltwCalendar component, commonly known as PHP Event Calendar. This vulnerability affects versions prior to 4.2.1 and poses significant security risks to web applications that utilize this calendar component. The flaw exists within the input validation mechanisms of the calendar application, specifically in how it processes user-supplied data that gets rendered back to web browsers without proper sanitization or encoding. The vulnerability's classification as a persistent XSS issue indicates that malicious scripts can be stored on the server and executed whenever the affected calendar component displays the compromised data to users, making it particularly dangerous for web applications that handle user-generated content or event submissions.
The technical nature of this vulnerability aligns with CWE-79, which specifically addresses Cross-Site Scripting flaws in web applications. The attack vector involves remote threat actors who can inject malicious HTML or JavaScript code through unspecified input points within the ltwCalendar component. These vectors likely include form fields, URL parameters, or other user-controllable inputs that are not properly sanitized before being processed and displayed by the calendar application. The vulnerability's impact extends beyond simple script execution as it allows attackers to potentially steal session cookies, redirect users to malicious websites, or perform actions on behalf of authenticated users, depending on the application's permission model and the attacker's objectives.
From an operational perspective, this vulnerability creates substantial risks for organizations using PHP Event Calendar components in their web applications. The persistent nature of the XSS flaw means that once exploited, malicious scripts can affect multiple users over extended periods, potentially compromising user sessions and data integrity. The vulnerability's presence in a calendar application specifically increases risk because such components often handle sensitive user information including personal events, scheduling data, and potentially confidential business information. Attackers could leverage this vulnerability to gain unauthorized access to user accounts, manipulate calendar entries, or conduct phishing attacks against other users of the affected system, making it a serious concern for any organization relying on web-based calendar functionality.
Security mitigations for CVE-2006-6228 primarily involve updating to version 4.2.1 or later of the ltwCalendar component, which would include proper input validation and output encoding mechanisms to prevent malicious script injection. Organizations should also implement comprehensive input sanitization processes, employ proper HTML encoding for all dynamic content, and deploy web application firewalls to detect and block suspicious script injection attempts. Additionally, implementing content security policies and regular security testing of web applications can help prevent exploitation of similar vulnerabilities. The ATT&CK framework categorizes such vulnerabilities under the T1059 technique for command and scripting interpreter, highlighting the importance of preventing malicious code execution through input validation and proper output encoding as recommended by industry security standards and best practices for web application security.