CVE-2000-0221 in Nautica Marlin
Summary
by MITRE
The Nautica Marlin bridge allows remote attackers to cause a denial of service via a zero length UDP packet to the SNMP port.
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Analysis
by VulDB Data Team • 09/19/2024
The vulnerability identified as CVE-2000-0221 affects the Nautica Marlin bridge implementation, specifically targeting its handling of network traffic on the Simple Network Management Protocol port. This issue represents a classic denial of service flaw where malicious actors can exploit the system's failure to properly process malformed network packets. The vulnerability manifests when the bridge receives a UDP packet with a zero-length payload directed toward the SNMP port, causing the system to become unresponsive or crash entirely. This type of attack falls under the category of malformed packet exploitation, which is a well-documented attack vector in network security.
The technical flaw resides in the insufficient input validation mechanisms within the Nautica Marlin bridge's SNMP service implementation. When processing UDP packets, the system fails to properly validate packet length and content before attempting to process the data. This lack of proper validation creates an execution path where zero-length packets can cause memory corruption or resource exhaustion within the SNMP daemon. The vulnerability is particularly concerning because it operates at the network protocol level, allowing attackers to exploit the system without requiring authentication or elevated privileges. This aligns with CWE-129, which addresses improper validation of length of input buffers, and represents a form of buffer overflow or resource exhaustion attack pattern.
From an operational perspective, this vulnerability can have significant impact on network availability and business continuity. The Nautica Marlin bridge serves as a critical networking component that facilitates communication between different network segments, making its denial of service particularly damaging. When exploited, the vulnerability can cause complete network disruption, forcing administrators to restart network services or potentially replace affected hardware. The attack is relatively simple to execute, requiring only the ability to send UDP packets to the target SNMP port, which makes it accessible to a wide range of threat actors. This vulnerability demonstrates the importance of robust input validation and proper error handling in network services, as outlined in the ATT&CK framework under the T1499 category for network denial of service attacks.
The mitigation strategies for this vulnerability include implementing proper input validation on all network services, particularly those handling SNMP traffic. Network administrators should configure firewalls to filter out malformed packets and implement rate limiting to prevent abuse of the SNMP service. Additionally, applying vendor-specific patches or updates that address the zero-length packet handling issue is essential. System monitoring should be enhanced to detect unusual traffic patterns that may indicate exploitation attempts. Organizations should also consider implementing network segmentation to limit the potential impact of such attacks and ensure that SNMP services are properly secured with strong authentication mechanisms. The vulnerability highlights the critical need for defense in depth strategies, where multiple layers of protection work together to prevent successful exploitation of network-based vulnerabilities.