CVE-2007-1110 in ActiveCalendar
Summary
by MITRE
Directory traversal vulnerability in data/showcode.php in ActiveCalendar 1.2.0 allows remote attackers to read arbitrary files via a .. (dot dot) in the page parameter.
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Analysis
by VulDB Data Team • 05/24/2025
The vulnerability identified as CVE-2007-1110 represents a classic directory traversal flaw within the ActiveCalendar 1.2.0 web application, specifically affecting the data/showcode.php component. This security weakness stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied data before processing. The vulnerability manifests when the application accepts a page parameter containing directory traversal sequences such as .. which allows attackers to navigate outside the intended directory structure and access files that should remain restricted. The flaw resides in the application's file inclusion logic where user input directly influences file path resolution without proper sanitization or validation checks. This type of vulnerability falls under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The security implications extend beyond simple file access as this vulnerability can potentially expose sensitive system information, configuration files, or even system credentials that might be stored in accessible locations within the application's directory structure.
The operational impact of this directory traversal vulnerability is significant as it enables remote attackers to execute unauthorized file system operations without authentication. An attacker can leverage this weakness to read arbitrary files from the server's file system, potentially accessing sensitive information such as database connection details, application configuration files, or even system-level files that contain critical security parameters. The vulnerability operates by manipulating the page parameter to include directory traversal sequences that cause the application to resolve file paths beyond the intended scope. This allows attackers to bypass normal access controls and potentially escalate their privileges within the application environment. The attack vector is particularly dangerous because it requires no special privileges or authentication, making it an attractive target for automated exploitation tools. The vulnerability aligns with ATT&CK technique T1083, which focuses on discovering file and directory permissions on compromised systems, and T1566, which covers credential access through various exploitation methods. The exploitation process typically involves crafting malicious URLs with encoded traversal sequences that, when processed by the vulnerable application, result in unauthorized file disclosure.
Mitigation strategies for CVE-2007-1110 should focus on implementing robust input validation and sanitization mechanisms within the ActiveCalendar application. The most effective immediate solution involves filtering and validating all user-supplied input parameters, particularly those used in file path resolution operations. Implementing a whitelist approach for acceptable page parameter values can prevent malicious traversal sequences from being processed. Additionally, the application should enforce strict directory boundaries using secure coding practices that prevent path resolution outside designated directories. The implementation of proper access controls and privilege separation mechanisms within the application can further limit the damage potential of such vulnerabilities. System administrators should also consider implementing web application firewalls that can detect and block suspicious traversal patterns in HTTP requests. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other components of the application. The remediation process must include updating the ActiveCalendar application to a patched version that addresses this specific vulnerability, as the original version 1.2.0 contains known security flaws that have been documented and addressed in subsequent releases. Organizations should also establish monitoring procedures to detect potential exploitation attempts and maintain up-to-date vulnerability assessments to prevent similar issues from arising in other web applications within their infrastructure.