CVE-2003-0719 in Windows
Summary
by MITRE
Buffer overflow in the Private Communications Transport (PCT) protocol implementation in the Microsoft SSL library, as used in Microsoft Windows NT 4.0 SP6a, 2000 SP2 through SP4, XP SP1, Server 2003, NetMeeting, Windows 98, and Windows ME, allows remote attackers to execute arbitrary code via PCT 1.0 handshake packets.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability described in CVE-2003-0719 represents a critical buffer overflow flaw within Microsoft's implementation of the Private Communications Transport protocol version 1.0, which is part of the SSL library used across multiple Windows operating systems. This security weakness affects a broad range of Microsoft products including Windows NT 4.0 Service Pack 6a, Windows 2000 Service Packs 2 through 4, Windows XP Service Pack 1, Windows Server 2003, NetMeeting applications, and older Windows 98 and ME systems. The vulnerability specifically manifests during the PCT 1.0 handshake process, which is a precursor to establishing secure communications between client and server components.
The technical flaw stems from inadequate input validation within the PCT protocol implementation where attacker-controlled data packets can cause memory buffer overflows. When the vulnerable SSL library processes PCT 1.0 handshake packets, it fails to properly validate the length or content of incoming data, allowing malicious actors to craft specially formatted packets that exceed the allocated buffer space. This overflow condition can overwrite adjacent memory locations, potentially corrupting critical program execution structures or allowing attackers to inject and execute arbitrary code within the context of the vulnerable application or system process. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, representing a fundamental memory safety issue that has been a persistent concern in software development.
The operational impact of this vulnerability is severe and far-reaching given the widespread deployment of affected Windows versions and the nature of the attack vector. Remote attackers can exploit this weakness without requiring any local privileges or authentication, making it particularly dangerous for networked environments. The ability to execute arbitrary code remotely means that attackers could gain complete control over affected systems, potentially leading to data theft, system compromise, network infiltration, or the establishment of persistent backdoors. This vulnerability particularly affects enterprise environments where older Windows systems may still be operational, creating significant exposure risks for organizations that have not yet migrated to supported platforms. The attack surface extends beyond individual systems to include network infrastructure components that rely on PCT protocol implementations for secure communications.
Mitigation strategies for this vulnerability require immediate action from system administrators and security teams. The most effective approach involves applying the official Microsoft security patches released in response to this vulnerability, which typically include updates to the SSL libraries and PCT protocol implementations. Organizations should prioritize patching all affected systems, particularly those running older Windows versions such as Windows NT 4.0, Windows 2000, and Windows ME which are no longer supported by Microsoft. Network segmentation and firewall rules can provide temporary protection by blocking or restricting PCT protocol traffic, though this approach is less effective than proper patching. Security monitoring should include detection of unusual PCT handshake patterns and malformed packets that may indicate exploitation attempts. The vulnerability also highlights the importance of maintaining current security practices and the need for organizations to implement robust patch management procedures to address similar issues in the future. This vulnerability aligns with ATT&CK technique T1210 which involves exploiting weaknesses in remote services to gain system access, demonstrating how legacy protocol implementations can create persistent security risks that require proactive remediation.