CVE-2005-3689 in XMB
Summary
by MITRE
post.php in XMB 1.9.2 allows remote attackers to obtain the installation path via an invalid fid parameter in a newthread action.
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Analysis
by VulDB Data Team • 07/13/2018
The vulnerability described in CVE-2005-3689 affects XMB version 1.9.2, a web-based bulletin board system that was widely used in the early 2000s for online community discussions. This particular flaw resides within the post.php script which handles various posting operations including thread creation. The vulnerability stems from insufficient input validation and error handling mechanisms that fail to properly sanitize user-supplied parameters before processing them within the application's backend logic. When a remote attacker submits a malformed fid parameter during a newthread action, the system does not adequately validate the input, leading to the exposure of sensitive installation path information through error messages or direct path disclosure.
The technical implementation of this vulnerability demonstrates a classic path disclosure issue that falls under CWE-200, which specifically addresses the exposure of sensitive information through improper error handling. The flaw occurs because the application's post.php script does not validate whether the supplied fid parameter corresponds to a legitimate forum identifier within the database. Instead, it processes the parameter directly and may generate error messages that inadvertently reveal the absolute file path where the application is installed. This occurs particularly when the system attempts to locate or validate the forum identifier and fails, resulting in error output that contains directory structure information. The vulnerability is particularly dangerous because it allows attackers to gain knowledge of the server's file system layout, which can be used as a foundation for further exploitation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with crucial reconnaissance data that can be leveraged for subsequent attacks. Once an attacker obtains the installation path, they can use this information to understand the application's directory structure, potentially identifying other sensitive files or directories that may be accessible through the web server. This information can be combined with other vulnerabilities to execute more sophisticated attacks such as local file inclusion or remote code execution. The vulnerability also violates fundamental security principles by exposing system information that should remain confidential, potentially allowing attackers to craft more targeted attacks against the specific server configuration. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1213 (Data from Information Repositories) as it enables adversaries to gather system information and potentially access repository data through path disclosure.
Mitigation strategies for CVE-2005-3689 should focus on implementing proper input validation and error handling mechanisms within the affected application. The most effective approach involves sanitizing all user-supplied parameters, particularly those used in database queries or file operations, by validating them against expected formats and ranges before processing. Implementing proper error handling that does not expose internal system information is critical, requiring that all error messages be generic and not reveal installation paths or system details. Organizations should also consider implementing proper access controls and input filtering mechanisms that prevent malicious parameters from reaching the vulnerable code paths. Additionally, upgrading to newer versions of XMB or migrating to more modern forum software solutions would provide complete protection against this vulnerability, as the flaw was addressed in subsequent releases through improved input validation and error handling practices. Security monitoring should also include detection of unusual error patterns that might indicate exploitation attempts, while maintaining regular security audits to identify similar vulnerabilities in other applications.