CVE-2019-4547 in Security Directory Server
Summary
by MITRE • 10/30/2020
IBM Security Directory Server 6.4.0 generates an error message that includes sensitive information about its environment, users, or associated data. IBM X-Force ID: 165949.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 11/30/2020
IBM Security Directory Server version 6.4.0 contains a vulnerability that exposes sensitive system information through error messages, creating potential attack vectors for malicious actors. This issue falls under the category of information disclosure vulnerabilities where the server inadvertently reveals details about its internal structure, user accounts, or data organization when processing requests that trigger error conditions. The vulnerability represents a classic example of poor error handling practices that violate fundamental security principles of least privilege and defense in depth. When the directory server encounters malformed requests or encounters access violations, it generates error responses that contain verbose debugging information including user identifiers, system paths, or internal data structures that should remain confidential. This behavior aligns with CWE-209, which specifically addresses the exposure of error messages containing sensitive information, and demonstrates how insecure error handling can provide attackers with valuable reconnaissance data for subsequent exploitation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it significantly weakens the overall security posture of systems relying on IBM Security Directory Server. Attackers can leverage the exposed information to build more targeted attacks against the directory service, potentially identifying valid user accounts, understanding the directory structure, and mapping out system components that might be vulnerable to additional exploits. The vulnerability creates opportunities for credential stuffing attacks, where exposed user information can be used to test credentials across multiple systems, or for privilege escalation attempts where attackers use the disclosed information to craft more sophisticated authentication bypass techniques. This issue particularly affects environments where directory servers are used for authentication and authorization services, as the exposed information directly impacts the security of user access controls and system integrity. The vulnerability also contributes to the broader category of reconnaissance activities that attackers use to map network infrastructure and identify potential targets for further exploitation, making it a significant concern for organizations implementing zero-trust security models where minimizing information exposure is critical.
Organizations should implement comprehensive mitigation strategies that address both immediate remediation needs and long-term security improvements. The primary recommendation involves applying the official IBM security patches released for this vulnerability, which typically include enhanced error handling mechanisms that sanitize error messages before transmission. Additionally, system administrators should configure the directory server to implement generic error responses that do not contain sensitive information, following the principle of least information disclosure. Network segmentation and access controls should be reinforced to limit exposure of the directory server to only necessary systems and users, reducing the potential impact of information disclosure. Security monitoring should be enhanced to detect unusual patterns of error message generation that might indicate exploitation attempts, while also implementing proper log management practices that ensure sensitive information is not inadvertently stored or transmitted in system logs. Organizations should also conduct regular security assessments to identify similar vulnerabilities in other systems and applications, as this type of error handling issue is common across many software platforms and represents a significant area of concern for compliance with industry standards such as iso 27001 and nist cybersecurity framework. The vulnerability serves as a reminder of the importance of secure coding practices and proper error handling implementation, which are fundamental requirements for maintaining robust security postures in enterprise environments.