CVE-2006-3937 in xGuestBook
Summary
by MITRE
post.php in x_atrix xGuestBook 1.02 allows remote attackers to obtain sensitive information via a request without the (1) user, (2) mail, (3) p, or (4) url parameter, which reveals the installation path in an error message.
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Analysis
by VulDB Data Team • 08/01/2018
The vulnerability identified as CVE-2006-3937 affects x_atrix xGuestBook version 1.02 and represents a sensitive data exposure issue that occurs when the post.php script processes requests lacking essential parameters. This flaw enables remote attackers to retrieve critical system information through crafted HTTP requests that omit the user, mail, p, or url parameters. The vulnerability stems from insufficient input validation and error handling mechanisms within the application's guestbook implementation.
The technical implementation of this vulnerability resides in the post.php script's failure to properly validate required parameters before processing user submissions. When attackers submit requests without the expected parameters, the application generates error messages that inadvertently disclose the server's installation path. This occurs because the script does not implement proper parameter checking or fallback mechanisms, leading to unhandled exceptions that reveal system-level information. The error message generation process lacks sanitization of path information, exposing directory structures that could aid attackers in subsequent exploitation attempts.
From an operational impact perspective, this vulnerability creates significant security risks for affected systems as it provides attackers with detailed information about the server's file structure and installation paths. The disclosure of installation paths enables attackers to better understand the system architecture and potentially identify other vulnerabilities through path-based reconnaissance. This information disclosure vulnerability aligns with CWE-200, which specifically addresses the exposure of sensitive information, and can be categorized under the ATT&CK technique T1212 for external remote exploitation. The vulnerability is particularly dangerous as it requires no authentication and can be exploited through simple HTTP requests.
The security implications extend beyond simple information disclosure as the revealed installation paths may expose the application's directory structure, potentially enabling attackers to craft more sophisticated attacks. Attackers can leverage this information to understand the application's deployment environment, identify potential file inclusion vulnerabilities, or plan further reconnaissance activities. The vulnerability demonstrates poor secure coding practices and highlights the importance of implementing proper error handling and input validation. Organizations should consider this issue as part of a broader security posture assessment, particularly when evaluating applications for information leakage vulnerabilities.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and error handling procedures within the application. The post.php script must be modified to validate all required parameters before processing requests and to implement generic error messages that do not reveal system paths. Security measures should include parameter validation, proper exception handling, and the implementation of secure error reporting mechanisms that sanitize all output. Organizations should also conduct regular security assessments to identify similar vulnerabilities in other applications and ensure that error messages do not contain sensitive system information. The fix should align with security best practices and industry standards for preventing information disclosure vulnerabilities while maintaining application functionality.