CVE-1999-0751 in Netscape
Summary
by MITRE
Buffer overflow in Accept command in Netscape Enterprise Server 3.6 with the SSL Handshake Patch.
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Analysis
by VulDB Data Team • 12/09/2024
The vulnerability described in CVE-1999-0751 represents a critical buffer overflow condition that existed within the Netscape Enterprise Server 3.6 implementation when processing the Accept command during SSL handshake operations. This specific flaw emerged in the context of web server security infrastructure where the server was designed to handle secure communications through the Secure Sockets Layer protocol. The vulnerability was particularly concerning because it occurred during the SSL handshake process, which is a fundamental component of establishing secure connections between clients and servers. The buffer overflow condition manifested when the server attempted to process incoming data during the Accept command execution phase, specifically within the SSL handshake patch implementation that was designed to address previous security concerns.
The technical nature of this buffer overflow stems from inadequate input validation and memory management within the server's SSL processing code. When the Accept command was invoked during the SSL handshake, the server failed to properly validate the length of incoming data before copying it into fixed-size memory buffers. This classic buffer overflow scenario allowed an attacker to provide malicious input that exceeded the allocated buffer space, resulting in memory corruption that could be exploited to execute arbitrary code. The vulnerability was particularly dangerous because it occurred at a low-level protocol handling stage, making it difficult to detect and exploit through conventional means. The flaw was classified under CWE-121 as a stack-based buffer overflow, where the attacker could overwrite adjacent memory locations including return addresses and control flow information.
The operational impact of this vulnerability was significant for organizations relying on Netscape Enterprise Server 3.6 for secure web services. Attackers could potentially exploit this weakness to gain unauthorized access to the server, execute malicious code with the privileges of the web server process, and potentially escalate their privileges to gain system-level control. The vulnerability was especially dangerous because it could be triggered through standard SSL connections, making it accessible to remote attackers without requiring physical access to the server. This meant that any organization using the affected server configuration was at risk of compromise, particularly those handling sensitive data or serving as critical infrastructure components. The vulnerability also impacted the availability of services as successful exploitation could lead to server crashes or unresponsive states, creating denial of service conditions.
Organizations affected by this vulnerability needed to implement immediate mitigations to protect their infrastructure. The primary recommendation was to apply the official SSL Handshake Patch provided by Netscape, which addressed the buffer overflow condition through proper input validation and memory boundary checking. System administrators were advised to conduct thorough vulnerability assessments to identify all instances of the affected server version and ensure comprehensive patch deployment across their network infrastructure. Additional protective measures included implementing network segmentation to limit access to the vulnerable server, configuring intrusion detection systems to monitor for exploitation attempts, and establishing incident response procedures to address potential compromises. The vulnerability highlighted the importance of proper input validation and memory management practices in security-critical applications, aligning with ATT&CK technique T1059.007 for command and scripting interpreter usage and T1133 for external remote services. Organizations were also encouraged to adopt more robust security monitoring approaches and maintain updated security patches to prevent similar vulnerabilities from being exploited in the future, as this flaw demonstrated the critical need for continuous security maintenance and vigilance in protecting web server infrastructure.