CVE-2006-2973 in Calendar Express
Summary
by MITRE
Multiple SQL injection vulnerabilities in month.php in PHP Lite Calendar Express 2.2 allow remote attackers to execute arbitrary SQL commands via the (1) catid and (2) cid parameter. NOTE: this might be a duplicate of CVE-2005-4009.c.
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Analysis
by VulDB Data Team • 08/04/2025
The vulnerability identified as CVE-2006-2973 represents a critical SQL injection flaw within PHP Lite Calendar Express version 2.2, specifically affecting the month.php script. This vulnerability exposes the application to remote code execution attacks through improper input validation and sanitization mechanisms. The flaw manifests when the application fails to adequately filter user-supplied data passed through the catid and cid parameters, creating pathways for malicious actors to inject arbitrary SQL commands directly into the database query execution layer.
The technical nature of this vulnerability aligns with CWE-89, which categorizes SQL injection as a code injection technique where untrusted data is incorporated into SQL queries without proper sanitization. Attackers can exploit this weakness by crafting malicious input strings that manipulate the SQL query structure, potentially gaining unauthorized access to sensitive database information, modifying or deleting records, or even executing administrative commands on the underlying database system. The vulnerability affects the month.php script which likely handles calendar category and event identification parameters, making it a critical point of entry for database compromise.
The operational impact of this vulnerability extends beyond simple data theft, as successful exploitation can lead to complete system compromise and unauthorized access to all calendar data stored within the application. Organizations using PHP Lite Calendar Express 2.2 face significant risk of data breaches, service disruption, and potential lateral movement within their network infrastructure. The remote nature of the attack means that threat actors do not require physical access to the system or local network privileges to exploit this vulnerability, making it particularly dangerous in environments where network exposure is high. The vulnerability also represents a classic example of insufficient input validation that violates fundamental security principles outlined in the OWASP Top Ten and other industry security frameworks.
Security mitigations for this vulnerability should include immediate implementation of proper input sanitization and parameterized queries to prevent SQL injection attacks. Organizations should apply the vendor-provided patch or upgrade to a newer version of PHP Lite Calendar Express that addresses this vulnerability. Additionally, implementing web application firewalls, input validation mechanisms, and regular security assessments can help detect and prevent exploitation attempts. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, highlighting the importance of securing web applications and implementing proper access controls. Network segmentation and monitoring for unusual database access patterns should also be implemented to detect potential exploitation attempts. Regular vulnerability scanning and security audits are essential to identify similar weaknesses in other applications and prevent similar incidents from occurring in the broader organizational infrastructure.