CVE-2001-1055 in Windows
Summary
by MITRE
The Microsoft Windows network stack allows remote attackers to cause a denial of service (CPU consumption) via a flood of malformed ARP request packets with random source IP and MAC addresses, as demonstrated by ARPNuke.
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Analysis
by VulDB Data Team • 01/30/2025
The vulnerability described in CVE-2001-1055 represents a significant weakness in Microsoft Windows network stack implementation that enables remote attackers to execute denial of service attacks through crafted ARP packet flooding. This flaw specifically targets the Address Resolution Protocol handling within Windows operating systems, exploiting the way these systems process and respond to ARP requests. The vulnerability was particularly notable because it demonstrated how network protocols could be manipulated to consume excessive CPU resources without requiring authentication or specialized privileges. The attack vector involves sending a high volume of malformed ARP requests where both source IP addresses and MAC addresses are randomized, causing the target system to expend considerable processing power attempting to handle these invalid packets.
The technical mechanism behind this vulnerability stems from inadequate validation and processing of ARP requests within the Windows network stack. When a Windows system receives an ARP request, it typically performs several operations including checking the validity of the address resolution, updating its ARP cache, and potentially responding to the request. In the case of CVE-2001-1055, the malformed packets with random source addresses trigger excessive processing overhead in the operating system's ARP handling routines. This processing overhead manifests as continuous CPU utilization as the system attempts to parse and respond to each malformed request, ultimately leading to system performance degradation or complete denial of service conditions. The vulnerability is classified under CWE-129 as an input validation issue where insufficient validation of ARP packet parameters allows malicious input to cause resource exhaustion.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise entire network infrastructure when multiple systems are affected simultaneously. Attackers leveraging this vulnerability can effectively consume system resources and cause cascading failures throughout networked environments, particularly affecting servers and network devices that handle substantial ARP traffic. The ARPNuke demonstration highlighted how this attack could be executed with minimal resources, making it particularly dangerous for network administrators to detect and mitigate. The vulnerability also exposes weaknesses in network monitoring and intrusion detection systems that may not properly identify or respond to this specific type of ARP-based denial of service attack. Organizations relying on Windows-based systems for network operations faced significant risk of operational disruption, as the attack could be launched from remote locations without requiring physical access or elevated privileges.
Mitigation strategies for CVE-2001-1055 involve implementing network-level protections and system-level configuration changes to reduce the vulnerability's impact. Network administrators should deploy ARP inspection mechanisms that validate ARP packet contents and filter out malformed requests before they reach the operating system's network stack. Implementing rate limiting for ARP requests and configuring systems to ignore ARP requests from certain source addresses can significantly reduce the effectiveness of such attacks. The Microsoft security advisory recommended applying patches and updates to address the underlying implementation flaws in the Windows network stack. Additionally, deploying network segmentation and access control measures can limit the scope of impact when attacks occur, while monitoring systems should be configured to detect unusual ARP traffic patterns that may indicate exploitation attempts. Organizations should also consider implementing network intrusion prevention systems that can detect and block malicious ARP traffic patterns, as this vulnerability aligns with techniques described in the attack pattern taxonomy under the MITRE ATT&CK framework for network denial of service operations.