CVE-2018-0967 in Windows
Summary
by MITRE
A denial of service vulnerability exists in the way that Windows SNMP Service handles malformed SNMP traps, aka "Windows SNMP Service Denial of Service Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 02/09/2021
The vulnerability identified as CVE-2018-0967 represents a critical denial of service weakness within the Windows SNMP Service component that specifically manifests when processing malformed SNMP traps. This issue stems from insufficient input validation mechanisms within the service's trap handling logic, creating an exploitable condition that can be leveraged by attackers to disrupt normal system operations. The vulnerability affects a broad range of Microsoft Windows operating systems including legacy versions such as Windows 7, Windows Server 2008, and Windows Server 2008 R2, as well as newer releases like Windows 10 and Windows Server 2016. The SNMP service operates as a network management protocol implementation that monitors and manages network devices, making this vulnerability particularly concerning for enterprise environments where network monitoring is critical.
The technical flaw underlying CVE-2018-0967 resides in the Windows SNMP service's inadequate handling of malformed SNMP trap packets that contain improperly formatted data structures or invalid sequence numbers. When the service receives such malformed traps, it fails to properly validate the incoming data before processing, leading to potential buffer overflows, memory corruption, or unhandled exceptions that cause the service to crash or become unresponsive. This behavior aligns with CWE-121, which describes heap-based buffer overflow conditions, and CWE-122, which addresses buffer overflow vulnerabilities in heap-based memory structures. The vulnerability demonstrates characteristics consistent with the ATT&CK technique T1499.004, which involves network denial of service attacks targeting network infrastructure components, and T1566.001, which encompasses spearphishing attacks that could potentially deliver malformed SNMP traps as part of a broader attack campaign.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network monitoring capabilities across affected systems. When the SNMP service crashes or becomes unresponsive, network administrators lose visibility into critical network infrastructure components that rely on SNMP for monitoring and management purposes. This creates a cascading effect where network issues may go undetected, potentially masking other security incidents or performance degradation problems. Organizations with extensive SNMP-based monitoring systems face significant operational challenges as the affected service may require manual restart, leading to extended periods of reduced network observability. The vulnerability particularly affects enterprise environments where network infrastructure relies heavily on SNMP protocols for automated monitoring and alerting systems, potentially creating blind spots in security operations that could be exploited by adversaries.
Mitigation strategies for CVE-2018-0967 should prioritize immediate patch deployment through Microsoft's regular security updates, as the vulnerability has been addressed in subsequent security releases. Organizations should implement network segmentation to limit exposure of SNMP services to untrusted networks and consider disabling SNMP traps if not actively required for monitoring purposes. Security configurations should include implementing proper input validation and sanitization measures for SNMP trap processing, along with enhanced monitoring to detect abnormal service behavior. The implementation of network-based intrusion detection systems can help identify malformed SNMP traffic patterns that may indicate exploitation attempts. Additionally, organizations should conduct regular vulnerability assessments to ensure SNMP services are properly configured and that unnecessary SNMP functionality has been disabled, aligning with the principle of least privilege and reducing the attack surface for potential exploitation. System administrators should also implement automated service restart mechanisms to minimize downtime when service crashes occur, while maintaining proper log monitoring to track any exploitation attempts against this vulnerability.