CVE-2019-4548 in Security Directory Server
Summary
by MITRE
IBM Security Directory Server 6.4.0 could allow a remote attacker to hijack the clicking action of the victim. By persuading a victim to visit a malicious Web site, a remote attacker could exploit this vulnerability to hijack the victim's click actions and possibly launch further attacks against the victim. IBM X-Force ID: 165950.
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Analysis
by VulDB Data Team • 03/28/2024
IBM Security Directory Server version 6.4.0 contains a critical vulnerability that enables remote attackers to perform clickjacking attacks against unsuspecting users. This vulnerability specifically affects the web-based administrative interface of the directory server, creating a dangerous attack surface where malicious actors can manipulate user interactions. The flaw stems from inadequate protection mechanisms that fail to prevent overlay attacks, allowing attackers to place malicious content beneath legitimate interface elements. This vulnerability aligns with CWE-1021, which categorizes improper restriction of potentially sensitive operations, and represents a significant concern for organizations relying on the server for identity management and access control.
The technical implementation of this clickjacking vulnerability involves the manipulation of web interface elements through transparent or semi-transparent layers that can capture user clicks intended for legitimate interface components. Attackers can create malicious web pages that embed the IBM Security Directory Server interface within invisible frames or overlays, making users believe they are interacting with the legitimate system while actually performing actions on the attacker-controlled content. This technique exploits the lack of proper frame-busting or click protection mechanisms in the web interface implementation, which should follow security standards such as those outlined in the OWASP Top Ten for web application security vulnerabilities. The attack requires minimal user interaction beyond visiting a malicious website, making it particularly dangerous for administrators who might unknowingly perform administrative actions while believing they are working with legitimate systems.
The operational impact of this vulnerability extends beyond simple session hijacking, as it could enable attackers to perform unauthorized administrative actions within the directory server environment. An attacker who successfully hijacks user clicks could potentially modify user accounts, change access permissions, add new users, or manipulate directory entries that control access to critical organizational resources. This represents a serious compromise of the security model for the directory server, as it undermines the principle of least privilege and could lead to privilege escalation attacks. The vulnerability particularly affects environments where administrators regularly access the web interface and where users may not be adequately trained to recognize clickjacking attempts. Organizations using this version of the server face potential exposure to data breaches, unauthorized access to sensitive identity information, and disruption of access control mechanisms that protect critical infrastructure.
Organizations should immediately apply the vendor-provided security patches and updates for IBM Security Directory Server version 6.4.0 to remediate this vulnerability. Additional mitigations include implementing proper content security policies that prevent embedding of the web interface in external frames, deploying frame-busting scripts, and educating administrators about recognizing suspicious web interactions. The vulnerability demonstrates the importance of implementing defense-in-depth strategies and maintaining current security practices, particularly for critical infrastructure components like directory servers. Security teams should also conduct regular vulnerability assessments to identify similar issues in other web-based administrative interfaces and ensure that proper web application security controls are in place to prevent similar clickjacking scenarios across the organization's technology stack.