CVE-1999-0753 in mSQL
Summary
by MITRE
The w3-msql CGI script provided with Mini SQL allows remote attackers to view restricted directories.
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Analysis
by VulDB Data Team • 10/23/2025
The vulnerability described in CVE-1999-0753 represents a critical directory traversal flaw in the w3-msql CGI script that was part of the Mini SQL web application suite. This issue emerged during an era when web server security was still developing and proper input validation was not yet a standard practice in web application development. The vulnerability specifically affects the w3-msql CGI script which was designed to provide web-based access to Mini SQL database functionality, but contained a fundamental security flaw in its directory navigation implementation.
The technical flaw in this vulnerability stems from inadequate input sanitization and validation within the CGI script's handling of user-supplied parameters. When users interacted with the w3-msql interface, the script failed to properly validate or sanitize the input parameters that controlled directory navigation. This allowed remote attackers to manipulate the script's behavior by injecting specially crafted directory traversal sequences such as ../ or similar path manipulation techniques. The vulnerability falls under the category of CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which is a well-documented weakness in web application security where applications fail to properly restrict file access to authorized directories.
The operational impact of this vulnerability was severe and far-reaching for systems running the affected Mini SQL software. Remote attackers could exploit this flaw to gain unauthorized access to restricted directories on the web server, potentially exposing sensitive system files, configuration data, and other confidential information. The vulnerability essentially allowed attackers to bypass normal access controls and navigate to directories outside the intended web root, potentially leading to complete system compromise. This type of vulnerability directly relates to ATT&CK technique T1083 - File and Directory Discovery, where adversaries attempt to enumerate file systems to locate sensitive data.
The implications of this vulnerability extended beyond simple information disclosure, as it could enable attackers to potentially execute arbitrary code or gain deeper system access depending on the server configuration and the specific files accessible through the directory traversal. Systems running this vulnerable CGI script were particularly at risk because the flaw existed at the web application level, making it accessible to anyone with network access to the web server. The vulnerability demonstrated the critical importance of proper input validation and access control mechanisms in web applications, as even a simple CGI script could provide attackers with extensive access to system resources.
Mitigation strategies for this vulnerability required immediate patching or replacement of the affected w3-msql CGI script with a secure version that properly validated input parameters and enforced access controls. Organizations needed to implement proper directory traversal prevention measures including input validation, path normalization, and strict access control policies. The vulnerability highlighted the necessity of regular security assessments and the importance of following secure coding practices such as those outlined in the OWASP Top Ten and other industry security standards. Additionally, implementing web application firewalls and proper network segmentation could help reduce the attack surface and limit the potential impact of such vulnerabilities in the future.