CVE-2023-28231 in Windows
Summary
by MITRE • 04/12/2023
DHCP Server Service Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 04/28/2023
The CVE-2023-28231 vulnerability represents a critical remote code execution flaw within the DHCP server service component of affected systems. This vulnerability arises from improper input validation and handling within the dynamic host configuration protocol server implementation, creating an avenue for malicious actors to execute arbitrary code on vulnerable systems. The flaw specifically manifests when the DHCP service processes malformed or specially crafted network packets containing malicious payloads. Attackers can exploit this vulnerability by sending carefully constructed DHCP messages to the target server, potentially leading to complete system compromise without requiring authentication credentials. The vulnerability affects systems running Microsoft Windows operating systems where the DHCP server service is installed and actively configured, making it particularly dangerous in enterprise environments where centralized network configuration management is common. According to CWE classification, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-787, representing out-of-bounds write vulnerabilities that can lead to arbitrary code execution. The ATT&CK framework categorizes this weakness under T1210 - Exploitation of Remote Services, highlighting how attackers can leverage network-based services to gain unauthorized access and execute malicious code. The technical implementation flaw occurs during the processing of DHCP offers and acks, where insufficient bounds checking allows attackers to overwrite memory regions and potentially redirect execution flow to malicious code segments. This vulnerability is particularly concerning because it can be exploited from remote locations without requiring physical access to the target system, making it a prime candidate for automated exploitation campaigns targeting unpatched networks. The impact extends beyond simple code execution as successful exploitation can result in complete system takeover, data exfiltration, and potential lateral movement within the network infrastructure. Organizations running affected DHCP server implementations face significant risk exposure, as the vulnerability can be exploited by attackers with minimal technical expertise and without requiring privileged network access. The exploitability of this vulnerability is enhanced by the fact that DHCP services are commonly enabled and configured in enterprise environments, providing attackers with numerous potential targets. Network monitoring systems should be configured to detect anomalous DHCP traffic patterns that might indicate exploitation attempts, as the malicious packets often contain unusual payload structures that deviate from standard DHCP operations. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches for core network services and highlights the need for robust network segmentation strategies to limit the potential impact of successful exploitation. Organizations should implement immediate mitigation measures including applying relevant security patches from Microsoft, disabling unnecessary DHCP server functionality, and monitoring network traffic for suspicious DHCP-related activity. Additionally, network administrators should consider implementing firewall rules to restrict DHCP server access to authorized network segments and establish comprehensive incident response procedures to address potential exploitation attempts. The vulnerability underscores the necessity of regular security assessments and vulnerability management programs to identify and remediate similar issues before they can be exploited by malicious actors. Proper network hygiene practices including regular patch management, access control reviews, and security monitoring are essential components of a comprehensive defense strategy against this type of remote code execution vulnerability.