CVE-2001-0503 in NetMeeting
Summary
by MITRE
Microsoft NetMeeting 3.01 with Remote Desktop Sharing enabled allows remote attackers to cause a denial of service via a malformed string to the NetMeeting service port, aka a variant of the "NetMeeting Desktop Sharing" vulnerability.
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Analysis
by VulDB Data Team • 06/24/2024
Microsoft NetMeeting 3.01 represents a legacy desktop sharing application that was part of the Windows 2000 and Windows NT 4.0 service packs, designed to facilitate remote desktop collaboration and screen sharing capabilities. The vulnerability described in CVE-2001-0503 specifically targets the NetMeeting service port when Remote Desktop Sharing is enabled, creating a critical security flaw that allows remote attackers to execute denial of service attacks. This vulnerability stems from inadequate input validation within the NetMeeting service implementation, particularly when processing malformed string data sent to the application's network listening port.
The technical flaw manifests as a buffer over-read condition or improper string handling within the NetMeeting service daemon, where the application fails to properly sanitize incoming network data before processing. When an attacker sends specially crafted malformed strings to the NetMeeting service port, the application's parsing routines become overwhelmed or crash, resulting in service termination and complete denial of service for legitimate users attempting to establish remote desktop connections. This vulnerability operates at the network protocol level and affects the application's ability to maintain stable connections, effectively rendering the desktop sharing functionality unavailable to authorized users. The flaw represents a classic example of insufficient data validation and error handling within network services, commonly categorized under CWE-129 as "Improper Validation of Array Index" or CWE-121 as "Stack-based Buffer Overflow" depending on the exact implementation details.
The operational impact of this vulnerability extends beyond simple service disruption, as it affects enterprise environments where NetMeeting was commonly deployed for remote collaboration and technical support scenarios. Organizations relying on this technology for remote desktop assistance would experience immediate service unavailability, potentially disrupting critical business processes and technical support operations. The vulnerability's remote exploitability means that attackers do not require local access or authentication credentials to trigger the denial of service condition, making it particularly dangerous in networked environments. Additionally, this vulnerability demonstrates the risks associated with legacy desktop sharing applications that were not designed with modern security considerations in mind, highlighting the importance of proper input validation and robust error handling in network services.
Mitigation strategies for this vulnerability require immediate action to disable or remove the vulnerable NetMeeting service functionality from affected systems, as Microsoft provided no official patches for this specific vulnerability due to the age of the software. Organizations should implement network segmentation to restrict access to the NetMeeting service ports, utilize firewall rules to block traffic on the affected ports, and consider migrating to modern remote desktop solutions such as Windows Remote Desktop Services or third-party alternatives that have proper security controls. The vulnerability underscores the importance of adhering to security best practices such as input validation, proper error handling, and regular security assessments, aligning with ATT&CK technique T1499.004 for Network Denial of Service attacks and emphasizing the need for secure coding practices as outlined in the OWASP Secure Coding Guidelines. System administrators should also consider implementing intrusion detection systems to monitor for unusual network traffic patterns that might indicate exploitation attempts against vulnerable services.