CVE-2010-0972 in Com Gcalendar
Summary
by MITRE
Directory traversal vulnerability in the GCalendar (com_gcalendar) component 2.1.5 for Joomla! allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the controller parameter to index.php.
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Analysis
by VulDB Data Team • 05/02/2026
The CVE-2010-0972 vulnerability represents a critical directory traversal flaw within the GCalendar component version 2.1.5 for Joomla! platforms. This vulnerability resides in the component's handling of user-supplied input through the controller parameter in the index.php script, creating an exploitable condition that allows remote attackers to manipulate file inclusion mechanisms. The flaw specifically manifests when the application fails to properly validate or sanitize the controller parameter, enabling attackers to craft malicious requests that traverse directory structures and access unauthorized local files.
The technical exploitation of this vulnerability leverages the fundamental weakness in input validation where the component does not adequately filter or sanitize the controller parameter before using it in file inclusion operations. When an attacker submits a request containing directory traversal sequences such as ..%2F or similar encoded variants in the controller parameter, the vulnerable application processes these inputs without proper sanitization, allowing the attacker to navigate to arbitrary directories on the server filesystem. This weakness directly maps to CWE-22, which defines improper limitation of a pathname to a restricted directory, commonly known as directory traversal or path traversal attacks. The vulnerability enables attackers to include and execute arbitrary local files, potentially leading to complete system compromise through the execution of malicious code within the web application context.
The operational impact of CVE-2010-0972 extends beyond simple file disclosure, as it provides attackers with the capability to execute arbitrary code on the target system. This remote code execution vulnerability allows adversaries to gain unauthorized access to the web server, potentially leading to data breaches, system compromise, and further lateral movement within network infrastructure. The attack surface is particularly concerning in Joomla! environments where the GCalendar component is installed, as it provides a direct pathway for attackers to escalate privileges and access sensitive system files, configuration data, and potentially other applications running on the same server. The vulnerability's remote nature means that attackers do not require physical access to the system, making it particularly dangerous for publicly accessible web applications.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The primary recommendation involves upgrading to a patched version of the GCalendar component, as the vulnerability was resolved in subsequent releases through proper input validation and sanitization of user-supplied parameters. Organizations should implement strict input validation controls that filter out directory traversal sequences and other malicious input patterns before they reach the file inclusion logic. Additionally, the principle of least privilege should be enforced by ensuring that web application processes run with minimal required permissions and that file inclusion operations are restricted to predefined, safe directories. Security measures should include implementing web application firewalls that can detect and block suspicious directory traversal patterns, as well as regular security audits and penetration testing to identify similar vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under T1059.007 for command and script injection, highlighting the importance of input validation and proper parameter handling in preventing such attacks. Organizations should also consider implementing runtime application self-protection mechanisms and monitoring for anomalous file access patterns that may indicate exploitation attempts.