CVE-2012-4450 in 389 Directory Server
Summary
by MITRE
389 Directory Server 1.2.10 does not properly update the ACL when a DN entry is moved by a modrdn operation, which allows remote authenticated users with certain permissions to bypass ACL restrictions and access the DN entry.
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Analysis
by VulDB Data Team • 12/29/2024
The vulnerability identified as CVE-2012-4450 affects the 389 Directory Server version 1.2.10, a robust open-source implementation of the Lightweight Directory Access Protocol that serves as a central directory service for organizations. This flaw represents a critical access control weakness that undermines the security model of the directory service by failing to properly maintain access control lists during directory entry reorganization operations. The vulnerability specifically manifests when a Directory Name (DN) entry undergoes a modification operation known as modrdn, which is used to rename or move directory entries within the directory tree structure. The flaw occurs because the server does not correctly propagate or update the Access Control List entries that govern access permissions when such moves occur, leaving the moved entry potentially accessible through unauthorized paths.
The technical nature of this vulnerability stems from improper state management within the directory server's access control mechanism. When an authenticated user with appropriate privileges performs a modrdn operation to move a DN entry, the server should automatically update all relevant ACL entries to maintain proper access controls. However, in version 1.2.10, this update process fails, allowing attackers who possess certain permissions to exploit the inconsistency between the directory structure and the access control information. This creates a scenario where a moved entry may retain access permissions that were originally intended for its previous location, or where the entry becomes accessible through paths that should have been restricted. The vulnerability specifically targets the server's inability to maintain referential integrity between directory entries and their associated access control information during relocation operations, which aligns with CWE-284, which addresses improper access control mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally compromises the integrity of the directory service's security model. An attacker who can successfully exploit this vulnerability gains unauthorized access to directory entries that should be restricted, potentially exposing sensitive information such as user credentials, organizational data, or system configuration details. The risk is particularly significant in enterprise environments where 389 Directory Server serves as a critical component for authentication and authorization services, as compromised access controls could lead to lateral movement within the network or access to privileged accounts. This vulnerability affects the core security assumptions of the directory service, as it allows attackers to bypass the expected access control boundaries that should protect sensitive data within the directory structure.
Organizations utilizing 389 Directory Server version 1.2.10 should prioritize immediate remediation through official patches provided by the software vendor, as this vulnerability represents a persistent access control flaw that could be exploited by attackers with legitimate access to the directory service. The mitigation strategy should include not only patching the software but also implementing additional monitoring for unauthorized directory modifications and access attempts. Security teams should conduct thorough audits of directory access controls and verify that all ACL entries have been properly updated following any directory restructuring operations. From an ATT&CK framework perspective, this vulnerability aligns with techniques related to privilege escalation and persistence through access control manipulation, as attackers could use this flaw to maintain access to sensitive directory resources. The vulnerability also represents a potential vector for credential theft and lateral movement within networks that rely on directory services for authentication and authorization, making it a critical concern for enterprise security operations and compliance requirements.