CVE-2008-4023 in Windows
Summary
by MITRE
Active Directory in Microsoft Windows 2000 SP4 does not properly allocate memory for (1) LDAP and (2) LDAPS requests, which allows remote attackers to execute arbitrary code via a crafted request, aka "Active Directory Overflow Vulnerability."
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Analysis
by VulDB Data Team • 05/26/2025
The Active Directory Overflow Vulnerability identified as CVE-2008-4023 represents a critical memory corruption flaw within Microsoft Windows 2000 Server with Service Pack 4 operating systems. This vulnerability specifically affects the Lightweight Directory Access Protocol (LDAP) and LDAP over SSL (LDAPS) implementations within Active Directory, creating a pathway for remote code execution attacks. The flaw stems from improper memory allocation handling when processing specially crafted LDAP requests, which can lead to buffer overflows and subsequent arbitrary code execution on affected systems. This vulnerability is particularly concerning as Active Directory serves as the cornerstone of enterprise directory services, making it a prime target for attackers seeking to compromise entire network infrastructures. The vulnerability affects systems running Windows 2000 Server with SP4 and related Windows 2000-based systems, representing a significant security risk for organizations relying on legacy infrastructure.
The technical exploitation of this vulnerability occurs when an attacker sends malformed LDAP or LDAPS requests to an Active Directory server, causing the memory allocation routines to process oversized data structures beyond their intended boundaries. This improper memory handling creates buffer overflow conditions that can be leveraged to overwrite critical memory locations, potentially allowing attackers to execute malicious code with the privileges of the affected service account. The vulnerability manifests as a classic stack-based buffer overflow in the LDAP processing components, where input validation fails to properly check the size of incoming data before copying it into fixed-length buffers. According to CWE standards, this maps to CWE-121: Stack-based Buffer Overflow, which is classified as a critical weakness in software security. The attack vector is remote and requires no authentication, making it particularly dangerous for networked environments where Active Directory services are exposed to untrusted networks.
The operational impact of CVE-2008-4023 extends far beyond individual system compromise, as Active Directory servers typically serve as central authentication points for enterprise networks. Successful exploitation can lead to complete domain compromise, allowing attackers to escalate privileges and move laterally throughout the network infrastructure. This vulnerability affects not only the targeted Active Directory server but can also impact the broader enterprise security posture by providing attackers with persistent access to network resources. Organizations may experience service disruptions, data breaches, and unauthorized access to sensitive corporate information. The vulnerability's remote exploitability means that attackers can target these systems from anywhere on the internet, making it particularly dangerous for organizations with exposed Active Directory services. According to ATT&CK framework, this vulnerability maps to T1078: Valid Accounts and T1003: OS Credential Dumping, as attackers can leverage compromised Active Directory services to gain access to legitimate user credentials and escalate privileges within the network environment.
Mitigation strategies for CVE-2008-4023 should include immediate implementation of Microsoft security patches, as the vulnerability was addressed through security updates released in 2008. Organizations should also implement network segmentation to limit access to Active Directory services, disable unnecessary LDAP and LDAPS services where possible, and deploy intrusion detection systems to monitor for suspicious LDAP traffic patterns. Network access controls should be implemented to restrict LDAP traffic to trusted sources only, and regular security audits should be conducted to identify and remediate any remaining vulnerable systems. Additionally, organizations should consider implementing multi-factor authentication mechanisms and credential hardening measures to reduce the potential impact of successful exploitation. Given that this vulnerability affects legacy Windows 2000 systems, organizations should prioritize migration to supported operating systems and ensure comprehensive patch management processes are in place to prevent similar vulnerabilities from affecting their infrastructure in the future.