CVE-2005-3517 in Chipmunk Guestbook
Summary
by MITRE
Chipmunk Scripts Guestbook allows remote attackers to obtain the installation path of the script via a URL that causes an error message to be displayed, such as a URL that contains a single quote ( ) in the start parameter of index.php.
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Analysis
by VulDB Data Team • 07/28/2017
The vulnerability identified as CVE-2005-3517 affects Chipmunk Scripts Guestbook software, representing a classic information disclosure flaw that exposes sensitive system details to remote attackers. This vulnerability specifically manifests when the application processes user input without proper sanitization, allowing malicious actors to manipulate URL parameters and trigger error messages that reveal the script's installation path. The flaw occurs within the index.php file when a single quote character is introduced into the start parameter, causing the application to generate an error message that inadvertently includes the full server path where the guestbook script is installed.
From a technical perspective, this vulnerability demonstrates poor input validation and error handling practices that violate fundamental security principles. The application fails to properly sanitize user-provided parameters before processing them, creating an opportunity for attackers to inject malicious input that triggers unintended behavior. This type of vulnerability falls under CWE-20, which addresses "Improper Input Validation," and specifically relates to CWE-200, "Information Exposure," as it exposes sensitive path information that could be leveraged for further attacks. The error message disclosure represents a form of path traversal information leak that provides attackers with critical infrastructure details.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposed installation path serves as a foundation for more sophisticated attacks. Attackers can use the revealed path information to craft targeted attacks against the specific version of the guestbook software, potentially identifying known vulnerabilities or weaknesses within that particular implementation. This information disclosure can facilitate directory traversal attacks, local file inclusion exploits, or other privilege escalation techniques that rely on understanding the application's file structure. The vulnerability also aligns with ATT&CK technique T1083, "File and Directory Discovery," as it provides adversaries with systematic access to directory structures and installation paths.
Mitigation strategies for CVE-2005-3517 should focus on implementing robust input validation and proper error handling mechanisms. The primary fix involves sanitizing all user input parameters before processing them within the application, specifically ensuring that special characters like single quotes are properly escaped or filtered. Additionally, error messages should be configured to not reveal sensitive system information to end users, implementing generic error pages that do not expose installation paths or server details. Organizations should also consider implementing web application firewalls that can detect and block suspicious parameter patterns, while regular security audits should verify that similar input validation flaws do not exist in other application components. The vulnerability highlights the importance of following secure coding practices and implementing proper error handling that prevents information leakage while maintaining application functionality.