CVE-2023-35638 in Windows
Summary
by MITRE • 12/12/2023
DHCP Server Service Denial of Service Vulnerability
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Analysis
by VulDB Data Team • 01/02/2024
This vulnerability resides within the dynamic host configuration protocol server service that manages network address allocation and related parameters for devices on a local network. The flaw represents a critical weakness in the dhcp server implementation that allows malicious actors to disrupt network operations through carefully crafted requests or packets designed to overwhelm system resources or exploit implementation gaps in the service handling mechanisms. Such vulnerabilities typically manifest when the dhcp server fails to properly validate incoming requests or handle malformed packets, leading to service disruption or complete system unavailability.
The technical nature of this vulnerability aligns with common software flaws categorized under CWE-129 Input Validation and CWE-400 Uncontrolled Resource Consumption. Attackers can exploit this weakness by sending specially crafted dhcp messages that trigger buffer overflows, memory exhaustion conditions, or other resource management failures within the server application. The attack pattern often follows established methodologies from the attack technique framework including ATT&CK T1499.004 Endpoint Denial of Service and T1566.002 Phishing via Service. These attacks typically require minimal privileges and can be executed remotely, making them particularly dangerous in enterprise environments where dhcp services form the backbone of network infrastructure.
The operational impact of such a vulnerability extends beyond simple service disruption to encompass broader network reliability concerns and potential business continuity issues. When dhcp servers become unavailable, network devices cannot obtain proper ip addresses or configuration parameters, resulting in widespread connectivity failures throughout affected networks. Organizations may experience cascading effects as dependent services like dns resolution, application communication, and security monitoring systems all begin to fail due to the core network infrastructure breakdown. The vulnerability affects organizations of all sizes but poses greater risk to those with complex network environments where dhcp services are heavily relied upon for automatic network configuration management.
Mitigation strategies should encompass multiple defensive layers including immediate patching of affected dhcp server implementations, network segmentation to isolate critical dhcp services, and implementation of monitoring systems that can detect anomalous dhcp traffic patterns. Network administrators should configure rate limiting on dhcp request processing and implement proper input validation mechanisms within the server software. Security measures should also include regular vulnerability assessments targeting dhcp implementations and maintaining up-to-date network configuration baselines that can quickly identify deviations from normal operational behavior. Additionally, organizations should establish incident response procedures specifically addressing dhcp service disruptions to minimize downtime and ensure rapid recovery of network operations.