CVE-1999-0177 in Website
Summary
by MITRE
the uploader program in the website web server allows a remote attacker to execute arbitrary programs.
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Analysis
by VulDB Data Team • 04/17/2026
The vulnerability described in CVE-1999-0177 represents a critical security flaw in web server implementations that enables remote code execution through an improperly configured file upload mechanism. This weakness specifically targets the uploader program component within website web servers, creating an avenue for malicious actors to bypass normal security controls and directly execute arbitrary code on the affected system. The vulnerability stems from inadequate input validation and access control measures that permit unauthorized file uploads without proper sanitization or restriction protocols.
This type of vulnerability falls under the broader category of insecure file upload mechanisms, which are commonly classified as CWE-434 and CWE-22 within the CWE database. The flaw essentially allows attackers to upload malicious files such as shell scripts, executable binaries, or web shells that can be executed by the web server with the privileges of the web application. The attack vector operates through standard HTTP protocols where an attacker can submit files through web forms or API endpoints without proper authorization checks or file type validation. This vulnerability directly maps to several techniques in the MITRE ATT&CK framework including T1190 for exploit for client execution and T1059 for command and script injection, demonstrating how initial access can quickly escalate to full system compromise.
The operational impact of CVE-1999-0177 is severe and potentially devastating for affected organizations. Once exploited, attackers can gain persistent access to the web server, potentially leading to complete system compromise, data exfiltration, and establishment of backdoors for continued unauthorized access. The vulnerability affects the fundamental security model of web applications by allowing attackers to bypass authentication mechanisms and directly manipulate the server's execution environment. Organizations may experience service disruption, data loss, regulatory compliance violations, and significant financial impact from the breach. The vulnerability is particularly dangerous because it often requires minimal technical expertise to exploit, making it attractive to both skilled and unskilled attackers.
Mitigation strategies for this vulnerability should focus on implementing comprehensive file upload security controls including strict file type validation, mandatory file content inspection, and proper access controls for upload directories. Organizations must ensure that uploaded files are stored in non-executable directories and that proper file extension and MIME type validation is enforced. The principle of least privilege should be applied to web server accounts, limiting their capabilities and preventing execution of uploaded content. Additionally, implementing web application firewalls, regular security auditing, and comprehensive intrusion detection systems can help identify and prevent exploitation attempts. Security patches and updates should be applied promptly, and organizations should conduct regular penetration testing to identify similar vulnerabilities in their web applications. The remediation process should include proper configuration management, network segmentation, and monitoring of upload activities to detect anomalous behavior that may indicate exploitation attempts.