CVE-2011-3406 in Windows
Summary
by MITRE
Buffer overflow in Active Directory, Active Directory Application Mode (ADAM), and Active Directory Lightweight Directory Service (AD LDS) in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote authenticated users to execute arbitrary code via a crafted query that leverages incorrect memory initialization, aka "Active Directory Buffer Overflow Vulnerability."
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Analysis
by VulDB Data Team • 01/21/2025
The CVE-2011-3406 vulnerability represents a critical buffer overflow flaw affecting Microsoft's directory services infrastructure including Active Directory, Active Directory Application Mode, and Active Directory Lightweight Directory Service across multiple Windows operating systems. This vulnerability stems from improper memory initialization during query processing within the directory service components, creating a condition where maliciously crafted queries can overwrite adjacent memory locations. The flaw specifically impacts Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 with their respective service packs, and Windows 7 Gold and SP1 versions, making it a widespread issue affecting enterprise directory services infrastructure. The vulnerability operates at the core of directory service operations where authentication and authorization queries are processed, potentially allowing attackers to gain unauthorized system access through carefully constructed LDAP queries.
The technical exploitation of this vulnerability occurs when authenticated users submit specially crafted queries to the Active Directory services, which then process these queries without proper bounds checking. The buffer overflow manifests during the memory allocation phase where insufficient validation allows data to exceed the allocated buffer space, potentially overwriting critical program variables, return addresses, or function pointers in memory. This memory corruption can be leveraged to execute arbitrary code with the privileges of the targeted service account, typically SYSTEM level access on the domain controller. The flaw's classification under CWE-121 indicates a classic stack-based buffer overflow condition, while its operational characteristics align with ATT&CK technique T1078.002 for valid accounts and T1068 for local privilege escalation, making it particularly dangerous in enterprise environments where domain controllers maintain elevated privileges.
The operational impact of CVE-2011-3406 extends beyond simple code execution to encompass complete domain compromise and persistent access to enterprise networks. Attackers who successfully exploit this vulnerability can establish backdoors, escalate privileges, and potentially move laterally across the network using stolen credentials or established persistence mechanisms. The vulnerability's remote execution capability means that authenticated attackers can exploit it from outside the network perimeter, making it particularly dangerous for organizations with exposed directory services or those using weak authentication controls. Organizations running affected systems face significant risk of data breaches, system compromise, and loss of directory service integrity, as the vulnerability affects core infrastructure components that control access to network resources and user authentication. The attack vector through LDAP queries makes it difficult to detect and prevent through traditional network monitoring, as legitimate directory service traffic appears normal until the malicious payload is executed.
Mitigation strategies for CVE-2011-3406 should prioritize immediate patch deployment through Microsoft's security updates, as the vulnerability has been addressed through official service releases. Organizations should implement network segmentation to limit access to directory services, enforce strong authentication controls including multi-factor authentication, and monitor directory service logs for suspicious query patterns. Network administrators should consider implementing intrusion detection systems specifically configured to detect LDAP-based attacks and monitor for unusual directory service behavior. The vulnerability's exploitation requires authentication, so implementing account lockout policies and regular credential rotation can reduce attack surface. Additionally, organizations should conduct vulnerability assessments to identify systems running affected versions and ensure proper patch management procedures are in place to prevent similar vulnerabilities from being exploited in the future, while also considering the implementation of zero-trust network architectures that minimize the impact of compromised credentials.