CVE-2008-3283 in Directory Server
Summary
by MITRE
Multiple memory leaks in Red Hat Directory Server 7.1 before SP7, Red Hat Directory Server 8, and Fedora Directory Server 1.1.1 and earlier allow remote attackers to cause a denial of service (memory consumption) via vectors involving (1) the authentication / bind phase and (2) anonymous LDAP search requests.
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Analysis
by VulDB Data Team • 08/16/2019
The vulnerability identified as CVE-2008-3283 represents a critical memory management flaw affecting Red Hat Directory Server and Fedora Directory Server implementations. This issue stems from inadequate memory handling during specific LDAP operations, creating persistent memory leaks that can be exploited remotely to exhaust system resources. The vulnerability impacts multiple server versions including Red Hat Directory Server 7.1 before SP7, Red Hat Directory Server 8, and Fedora Directory Server 1.1.1 and earlier releases, indicating a widespread concern within the directory services infrastructure. The flaw specifically manifests during authentication bind operations and anonymous LDAP search requests, making it particularly dangerous as it can be triggered by unauthenticated attackers.
The technical implementation of this vulnerability involves improper memory allocation and deallocation mechanisms within the LDAP server's processing pipeline. During authentication bind phases, the server fails to properly release allocated memory blocks when processing malformed or malicious LDAP bind requests, while anonymous search operations exhibit similar memory retention issues when handling specific search filters or request parameters. This memory leak pattern creates a gradual consumption of available system memory over time, leading to system instability and eventual denial of service conditions. The vulnerability operates at the application layer of the network stack, leveraging the standard LDAP protocols while exploiting fundamental memory management flaws in the directory server implementation.
The operational impact of CVE-2008-3283 extends beyond simple service disruption to potentially compromise entire directory services infrastructure. Attackers can repeatedly submit malicious requests to consume system memory resources until the server becomes unresponsive or crashes entirely, effectively rendering directory services unavailable to legitimate users. This vulnerability particularly affects organizations relying on LDAP-based authentication and directory services, where directory servers serve as critical infrastructure components for user authentication, access control, and service discovery. The remote nature of the exploit means that attackers do not require local system access or credentials to initiate the memory consumption attacks, making it a significant threat vector for network-based adversaries.
From a cybersecurity framework perspective, this vulnerability maps to CWE-401: Improper Release of Memory and aligns with ATT&CK technique T1499.004: Endpoint Denial of Service, specifically targeting resource exhaustion attacks. The vulnerability demonstrates poor input validation and memory management practices that violate fundamental security principles. Organizations should implement immediate mitigations including applying the relevant security patches and updates provided by Red Hat and Fedora, implementing network-based rate limiting for LDAP traffic, and monitoring system memory consumption patterns for anomalous behavior. Additionally, network segmentation and access control measures can help limit the attack surface and reduce the potential impact of exploitation attempts. The vulnerability serves as a reminder of the critical importance of proper memory management in server applications and the necessity of regular security updates to address known vulnerabilities in directory services infrastructure.