CVE-2003-1535 in Guestbook
Summary
by MITRE
Justice Guestbook 1.3 allows remote attackers to obtain the full installation path via a direct request to cfooter.php3, which leaks the path in an error message.
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Analysis
by VulDB Data Team • 01/02/2025
The vulnerability identified as CVE-2003-1535 affects Justice Guestbook version 1.3, a web application designed for managing guestbook entries on websites. This flaw represents a classic information disclosure vulnerability that exposes sensitive system details to unauthorized users. The vulnerability specifically manifests when attackers make direct requests to the cfooter.php3 script, which is part of the guestbook's underlying code structure. The flaw demonstrates poor input validation and error handling practices that are commonly observed in legacy web applications from the early 2000s era.
The technical mechanism behind this vulnerability involves the application's failure to properly sanitize or validate incoming requests to the cfooter.php3 file. When this specific file is accessed directly without proper authentication or validation, the web application generates an error message that inadvertently includes the complete server path where the application is installed. This occurs because the application's error handling routine does not adequately filter or escape path information before displaying it to users. The error message contains the full filesystem path, which typically includes directory structures, filenames, and potentially sensitive system information that could aid attackers in subsequent exploitation attempts. This vulnerability aligns with CWE-200, which defines information exposure through error messages, and represents a fundamental flaw in secure coding practices that violates the principle of least privilege and information hiding.
The operational impact of this vulnerability extends beyond simple path disclosure, as it provides attackers with critical system information that can be leveraged for more sophisticated attacks. The leaked installation path can reveal directory structures, potentially exposing other application components, configuration files, or sensitive directories that might be accessible through the same application. This information disclosure creates opportunities for attackers to map the application's file structure, identify potential weaknesses in directory permissions, or discover other vulnerable components within the same installation. The vulnerability also contributes to the broader category of reconnaissance activities that attackers perform before launching more targeted attacks, as the disclosed path information can be used to plan directory traversal attacks or identify other potential entry points. This aligns with ATT&CK technique T1083, which covers directory and file discovery activities.
Mitigation strategies for this vulnerability require immediate attention through several remediation approaches that address both the immediate security issue and broader application security practices. The most direct solution involves modifying the application's error handling mechanism to prevent path information from being displayed in error messages, which can be achieved through proper input validation and error suppression techniques. Application developers should implement proper exception handling that does not expose internal system details to end users. Additionally, access controls should be strengthened to prevent direct access to internal application files, particularly those that are not intended for public access. Security hardening practices should include restricting access to PHP files through server configuration, implementing proper authentication mechanisms, and ensuring that error messages are generic and do not contain sensitive system information. The vulnerability also underscores the importance of regular security assessments and code reviews to identify similar flaws in legacy applications, as this type of information disclosure vulnerability remains relevant in modern security contexts where applications may not properly sanitize user inputs or handle errors securely.