CVE-2007-3182 in Calendarix
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Calendarix 0.7.20070307, when register_globals is enabled, allow remote attackers to inject arbitrary web script or HTML via the (1) year and (2) month parameters to calendar.php, and the (3) leftfooter parameter to cal_footer.inc.php. NOTE: the ycyear parameter to yearcal.php is already covered by CVE-2006-1835.
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Analysis
by VulDB Data Team • 06/25/2025
The vulnerability described in CVE-2007-3182 represents a critical cross-site scripting flaw affecting Calendarix version 0.7.20070307, specifically when the PHP configuration directive register_globals is enabled. This configuration setting automatically exposes all GET, POST, and cookie variables as global variables within the PHP script execution context, creating a significant security risk that amplifies the impact of input validation deficiencies. The vulnerability exists in multiple components of the application including calendar.php, cal_footer.inc.php, and yearcal.php, demonstrating the widespread nature of the input sanitization failure.
The technical exploitation of this vulnerability occurs through the manipulation of specific HTTP parameters that are directly incorporated into the application's output without proper sanitization or encoding. Attackers can inject malicious script code through the year and month parameters in calendar.php, which are processed and displayed without adequate validation, allowing arbitrary HTML and JavaScript execution within the context of authenticated user sessions. Additionally, the leftfooter parameter in cal_footer.inc.php provides another injection vector where malicious content can be inserted into the footer section of calendar pages. These vulnerabilities are particularly dangerous because they leverage the inherent insecurity of register_globals, which bypasses normal input validation mechanisms by making all external input immediately accessible as global variables.
The operational impact of these XSS vulnerabilities extends beyond simple script injection, as they can be exploited to perform session hijacking, defacement of calendar content, and redirection of users to malicious websites. When register_globals is enabled, the vulnerability becomes even more severe because it eliminates the need for attackers to carefully construct parameter names that match the expected input structure, as all parameters are automatically available in the global scope. This creates a scenario where even poorly validated inputs can be exploited with minimal technical sophistication. The attack surface is further expanded by the fact that these vulnerabilities affect core calendar functionality, making them particularly attractive to threat actors seeking to compromise user sessions or manipulate calendar data.
Organizations should immediately disable the register_globals configuration directive in PHP environments running Calendarix or similar applications, as this alone would prevent exploitation of these vulnerabilities. Proper input validation and output encoding mechanisms must be implemented to sanitize all user-supplied data before it is processed or displayed, following the principle of least privilege and defense in depth. The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a classic example of how insecure configuration settings can amplify the impact of existing code vulnerabilities. Mitigation strategies should include immediate patching of the Calendarix application to version 0.7.20070307 or later, implementation of proper parameter validation routines, and deployment of web application firewalls to detect and prevent XSS attack patterns. Additionally, security awareness training for developers should emphasize the dangers of register_globals and the importance of proper input sanitization practices, as these vulnerabilities often stem from fundamental security misconfigurations rather than complex coding errors.
The attack patterns associated with this vulnerability align with ATT&CK technique T1566.001, which covers the exploitation of web applications through injection attacks, specifically targeting the execution of malicious scripts in user browsers. This vulnerability demonstrates how insecure configuration settings can create persistent security weaknesses that affect multiple application components, making it a prime example of how configuration management and input validation should be considered together in security architecture design.