CVE-2012-0743 in Tivoli Directory Server
Summary
by MITRE
IBM Tivoli Directory Server (TDS) 6.3 and earlier allows remote attackers to cause a denial of service (daemon crash) via a malformed LDAP paged search request.
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Analysis
by VulDB Data Team • 03/24/2021
The vulnerability identified as CVE-2012-0743 affects IBM Tivoli Directory Server version 6.3 and earlier implementations, representing a critical denial of service weakness that can be exploited remotely by malicious actors. This vulnerability specifically targets the LDAP (Lightweight Directory Access Protocol) paged search functionality within the directory server daemon, which is a fundamental component used for efficiently retrieving large datasets from directory services. The flaw exists in how the TDS daemon processes malformed LDAP paged search requests, creating a condition where legitimate operations can be disrupted through carefully crafted malicious input.
The technical nature of this vulnerability stems from inadequate input validation mechanisms within the LDAP processing layer of the Tivoli Directory Server. When a malformed paged search request is submitted to the server, the daemon fails to properly handle the malformed data structure, leading to an uncontrolled crash or daemon termination. This behavior manifests as a complete service disruption, effectively preventing legitimate users and applications from accessing directory services until the daemon is manually restarted or the system is rebooted. The vulnerability operates at the protocol level, making it particularly dangerous as it can be exploited through standard network connections without requiring authentication or elevated privileges.
The operational impact of this vulnerability extends beyond simple service interruption, as directory servers typically serve as critical infrastructure components for authentication, authorization, and identity management across enterprise environments. When the TDS daemon crashes due to this vulnerability, it can cascade into broader system failures affecting multiple applications and services that depend on directory services for user authentication and access control. Organizations may experience widespread disruption of their IT infrastructure, including email systems, network authentication services, and application access controls that rely on the directory server for user validation.
From a cybersecurity perspective, this vulnerability aligns with CWE-121, which addresses buffer overflow conditions, and represents a classic example of improper input validation that can lead to denial of service attacks. The ATT&CK framework categorizes this as a denial of service technique, specifically falling under the T1499 sub-technique of network denial of service. The vulnerability's remote exploitability means that attackers can trigger the service disruption from external networks without requiring physical access or local system privileges, making it particularly attractive for adversaries seeking to disrupt business operations. Organizations should implement immediate mitigation measures including applying the vendor-provided security patches, implementing network segmentation to limit access to directory services, and establishing monitoring protocols to detect unusual daemon crash patterns that may indicate exploitation attempts.
The remediation approach for CVE-2012-0743 requires organizations to upgrade their IBM Tivoli Directory Server installations to versions that contain the necessary security fixes and input validation improvements. Additionally, implementing network access controls to restrict LDAP traffic to trusted sources and deploying intrusion detection systems that can monitor for malformed LDAP requests provides defense-in-depth strategies. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other directory services and network infrastructure components that may present analogous attack surfaces requiring similar mitigation approaches.