CVE-2001-0974 in Internet Directory
Summary
by MITRE
Format string vulnerabilities in Oracle Internet Directory Server (LDAP) 2.1.1.x and 3.0.1 allow remote attackers to execute arbitrary code, as demonstrated by the PROTOS LDAPv3 test suite.
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Analysis
by VulDB Data Team • 04/08/2019
The vulnerability identified as CVE-2001-0974 represents a critical format string flaw within Oracle Internet Directory Server versions 2.1.1.x and 3.0.1 that operates at the Lightweight Directory Access Protocol level. This vulnerability stems from improper input validation within the LDAP server implementation where user-supplied data is directly processed through format string functions without adequate sanitization. The flaw specifically manifests when the server processes LDAP bind operations and other directory services requests that contain untrusted input data, creating opportunities for attackers to manipulate memory layout through carefully crafted format specifiers. The vulnerability is particularly dangerous because it exists within a core directory service component that typically operates with elevated privileges and handles authentication requests from multiple clients simultaneously. The attack vector is remote, meaning malicious actors can exploit this weakness from outside the network perimeter without requiring prior authentication or access to the system.
The technical exploitation of this format string vulnerability follows established patterns that align with common attack techniques documented in the attack mitigation frameworks. When the Oracle Internet Directory Server processes LDAP requests containing malicious format specifiers, the server's internal string handling functions interpret these specifiers as instructions for memory access rather than literal text. This misinterpretation allows attackers to read arbitrary memory locations, potentially extract sensitive information such as passwords or session tokens, and ultimately execute arbitrary code with the privileges of the directory server process. The vulnerability is particularly concerning because it affects the LDAP protocol implementation itself, which is fundamental to directory services and often used for authentication and authorization across enterprise networks. The PROTOS LDAPv3 test suite demonstration confirms that this vulnerability can be reliably exploited through standard LDAP operations, making it accessible to attackers with basic knowledge of LDAP protocols and format string exploitation techniques.
The operational impact of this vulnerability extends far beyond simple code execution capabilities and represents a significant threat to enterprise security infrastructure. Organizations relying on Oracle Internet Directory Server for directory services, authentication, and access control face potential compromise of their entire directory infrastructure, which often serves as the foundation for network authentication and user management systems. Successful exploitation could enable attackers to gain unauthorized access to sensitive directory information, modify user accounts, create backdoor access points, or escalate privileges to gain full control over the directory server. The vulnerability's presence in directory services makes it particularly attractive to attackers because directory servers typically run with elevated privileges and may contain critical authentication data that can be leveraged for broader network infiltration. Additionally, the impact extends to downstream systems that depend on the directory service for authentication, potentially creating cascading security failures throughout the enterprise network infrastructure.
Mitigation strategies for CVE-2001-0974 must address both immediate remediation and long-term security posture improvements. The primary recommendation involves applying vendor patches and updates released by Oracle to fix the format string vulnerability in the affected versions of Internet Directory Server. Organizations should also implement network segmentation and access controls to limit exposure of directory services to untrusted networks while monitoring for suspicious LDAP traffic patterns. Security teams should conduct thorough vulnerability assessments to identify all instances of affected Oracle Internet Directory Server versions within their infrastructure and prioritize remediation efforts based on risk assessment. Configuration hardening measures including disabling unnecessary LDAP features, implementing strict input validation for all directory service requests, and deploying intrusion detection systems specifically tuned to detect format string exploitation attempts should be implemented. This vulnerability aligns with CWE-134 which specifically addresses format string vulnerabilities in software systems, and represents a clear example of how protocol-level flaws can be exploited to achieve privilege escalation and arbitrary code execution. The ATT&CK framework categorizes this vulnerability under privilege escalation and execution techniques, specifically targeting the use of software vulnerabilities to gain elevated system access. Organizations should also consider implementing comprehensive logging and monitoring of directory service activities to detect potential exploitation attempts and maintain audit trails for forensic analysis.