CVE-1999-1469 in w3-auth
Summary
by MITRE
Buffer overflow in w3-auth CGI program in miniSQL package allows remote attackers to execute arbitrary commands via an HTTP request with (1) a long URL, or (2) a long User-Agent MIME header.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability described in CVE-1999-1469 represents a critical buffer overflow flaw within the w3-auth CGI program that is part of the miniSQL package. This issue exposes a fundamental security weakness in how the application handles input validation, particularly when processing HTTP requests containing excessively long strings. The vulnerability specifically affects the authentication mechanism of the miniSQL web server implementation, creating a pathway for malicious actors to exploit the system through carefully crafted HTTP requests. The flaw exists in the way the CGI program processes URL parameters and User-Agent header values, which are commonly used components in web communication protocols.
The technical implementation of this buffer overflow stems from inadequate bounds checking within the w3-auth CGI program's input handling routines. When an HTTP request containing an overly long URL or User-Agent header is processed, the program fails to properly validate the length of incoming data before copying it into fixed-size buffers. This classic programming error allows attackers to overwrite adjacent memory locations, potentially corrupting the program's execution flow. The vulnerability manifests through two distinct attack vectors that leverage different HTTP request components, providing attackers with multiple opportunities to exploit the flaw. The buffer overflow occurs during the parsing and processing phases of the CGI script, where input data is directly copied without sufficient length verification mechanisms. This type of vulnerability is categorized under CWE-121 as a stack-based buffer overflow, which represents a well-documented weakness in software development practices.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it enables remote code execution capabilities for attackers who successfully exploit the buffer overflow. When successfully exploited, the vulnerability allows malicious actors to execute arbitrary commands on the affected system with the privileges of the web server process. This presents a significant risk to web server security, as attackers can potentially gain unauthorized access to sensitive data, modify system configurations, or establish persistent access points within the network infrastructure. The attack surface is particularly concerning given that the vulnerability can be triggered through common web browser interactions, making it accessible to attackers with minimal technical expertise. The miniSQL package's web interface components become vulnerable attack vectors that can compromise the entire server environment, potentially leading to full system compromise and data breaches.
Security mitigations for this vulnerability should prioritize immediate patching of the affected miniSQL package to address the buffer overflow conditions in the w3-auth CGI program. Organizations must implement input validation measures that enforce strict length limitations on URL parameters and HTTP headers to prevent overflow conditions. Network-level protections such as web application firewalls can help detect and block malicious requests containing oversized parameters before they reach the vulnerable application. System administrators should also consider implementing security monitoring to identify unusual patterns of HTTP requests that may indicate exploitation attempts. The remediation process should include thorough code review of all CGI programs within the miniSQL package to identify similar buffer overflow vulnerabilities. Additionally, implementing proper error handling and memory management practices in web applications can help prevent similar issues from occurring in other components. This vulnerability highlights the importance of adhering to secure coding practices and following established security frameworks such as those outlined in the ATT&CK framework under the T1059.007 technique for command and scripting interpreter, which describes how attackers can leverage such vulnerabilities to execute malicious commands remotely. Organizations should also consider implementing principle of least privilege access controls to limit the potential damage from successful exploitation attempts, as the vulnerability allows execution with web server privileges that may be elevated depending on the system configuration.