CVE-2001-1451 in Windows
Summary
by MITRE
Memory leak in the SNMP LAN Manager (LANMAN) MIB extension for Microsoft Windows 2000 before SP3, when the Print Spooler is not running, allows remote attackers to cause a denial of service (memory consumption) via a large number of GET or GETNEXT requests.
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Analysis
by VulDB Data Team • 12/27/2024
The vulnerability identified as CVE-2001-1451 represents a critical memory management flaw within the SNMP LAN Manager MIB extension of Microsoft Windows 2000 systems. This issue specifically affects systems where the Print Spooler service is not actively running, creating a unique attack vector that exploits the SNMP implementation's handling of certain request types. The vulnerability resides in the Windows 2000 operating system's network management infrastructure, particularly within the SNMP subsystem that interfaces with the LAN Manager MIB extension, which is designed to provide system information through the Simple Network Management Protocol. This memory leak occurs during the processing of SNMP GET and GETNEXT requests, which are standard operations used by network management systems to query device information.
The technical flaw manifests as a memory consumption issue that progressively depletes available system memory through repeated SNMP requests. When remote attackers send a large volume of GET or GETNEXT requests to the vulnerable Windows 2000 system, the SNMP service fails to properly release allocated memory resources after processing each request. This results in a gradual accumulation of memory usage that eventually leads to system instability and complete denial of service. The vulnerability is particularly insidious because it can be exploited without requiring authentication or elevated privileges, making it accessible to any remote attacker with network connectivity to the target system. The memory leak occurs specifically within the SNMP MIB processing logic, where the system maintains references to memory structures that should be properly deallocated after request processing, but instead remain allocated indefinitely.
The operational impact of CVE-2001-1451 extends beyond simple system performance degradation to complete service disruption. Systems affected by this vulnerability can experience progressive memory exhaustion that ultimately renders the system unusable, forcing administrators to reboot the affected machines to restore normal operations. This vulnerability particularly affects enterprise environments where Windows 2000 servers are configured to run SNMP services for network monitoring and management purposes. The attack scenario typically involves a sustained flood of SNMP requests that gradually consume available memory resources until the system becomes unresponsive. Organizations with multiple Windows 2000 systems running SNMP services and not utilizing the Print Spooler service are at significant risk, as these systems present the optimal conditions for exploitation.
The vulnerability maps directly to CWE-401, which describes improper handling of memory allocation and deallocation, specifically memory leaks in software systems. This weakness is categorized under the broader class of memory management errors that can lead to resource exhaustion and system instability. From an attack perspective, this vulnerability aligns with ATT&CK technique T1499.001, which involves network denial of service attacks through resource exhaustion, and T1071.004, which covers application layer protocols such as SNMP that can be leveraged for malicious purposes. The attack vector operates through the network protocol layer, utilizing the standard SNMP communication channels that are commonly enabled and accessible in enterprise environments. Organizations should consider implementing network segmentation and access control measures to limit SNMP access to trusted management systems while applying the appropriate Microsoft security patches.
Mitigation strategies for CVE-2001-1451 should focus on immediate patch deployment and network-level controls. Microsoft released Windows 2000 Service Pack 3 and subsequent updates that address this memory leak issue by correcting the SNMP MIB processing logic to properly handle memory allocation and deallocation. Organizations should prioritize deployment of these security updates across all affected Windows 2000 systems, particularly those running SNMP services without the Print Spooler service. Network-level mitigations include implementing SNMP access controls through firewall rules that restrict SNMP traffic to authorized management stations only, configuring SNMP community strings with limited permissions, and monitoring SNMP traffic for unusual request patterns that may indicate exploitation attempts. Additionally, system administrators should consider disabling SNMP services entirely if they are not required for network management purposes, as this eliminates the attack surface entirely. Regular system monitoring and memory usage tracking can help detect early signs of exploitation, allowing for rapid response to potential attacks before complete system failure occurs.