CVE-2003-0122 in Lotus Domino
Summary
by MITRE
Buffer overflow in Notes server before Lotus Notes R4, R5 before 5.0.11, and early R6 allows remote attackers to execute arbitrary code via a long distinguished name (DN) during NotesRPC authentication and an outer field length that is less than that of the DN field.
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Analysis
by VulDB Data Team • 08/24/2025
The vulnerability identified as CVE-2003-0122 represents a critical buffer overflow flaw affecting IBM Lotus Notes server implementations across multiple versions including pre-R4, pre-5.0.11 R5, and early R6 releases. This security weakness stems from inadequate input validation mechanisms within the NotesRPC authentication process, specifically when handling distinguished name (DN) fields. The flaw manifests when the outer field length parameter is deliberately set to a value smaller than the actual distinguished name field, creating a condition where memory allocation becomes insufficient to accommodate the incoming data. This fundamental design oversight enables malicious actors to craft specially formatted requests that exceed buffer boundaries, potentially leading to arbitrary code execution on the targeted server. The vulnerability operates at the application layer and specifically targets the authentication mechanism, making it particularly dangerous as it could allow unauthorized individuals to gain control over Notes server operations without proper credentials.
The technical exploitation of this buffer overflow vulnerability follows a classic pattern where insufficient bounds checking allows data to overwrite adjacent memory locations. During NotesRPC authentication, the server processes incoming distinguished names without adequate validation of field length parameters, creating a scenario where a maliciously constructed DN field can cause stack corruption. The mismatch between the declared outer field length and the actual DN content creates a exploitable condition where additional bytes spill into adjacent memory regions, potentially overwriting return addresses, function pointers, or other critical program state information. This type of vulnerability maps directly to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflows where insufficient memory allocation leads to data corruption. The vulnerability's exploitation requires minimal privileges since it targets the authentication process, making it particularly attractive to attackers seeking to establish persistent access to Notes server environments.
The operational impact of CVE-2003-0122 extends beyond simple code execution to encompass complete system compromise and potential data breaches within organizations relying on Lotus Notes infrastructure. Successful exploitation could enable attackers to execute arbitrary commands with the privileges of the Notes server process, potentially leading to complete system takeover or lateral movement within network environments. The vulnerability affects organizations using older Notes server versions where patches may not have been deployed, creating a significant risk for enterprises maintaining legacy systems. Given that Notes server implementations often serve as critical communication platforms within corporate environments, the compromise of such systems could result in unauthorized access to sensitive business communications, document repositories, and potentially confidential data exchanges. The attack vector is particularly concerning as it requires no prior authentication and can be executed remotely, making it suitable for automated exploitation campaigns targeting vulnerable Notes server installations. Organizations utilizing the ATT&CK framework would categorize this vulnerability under T1210 - Exploitation of Remote Services, specifically targeting T1075 - Pass the Hash and T1059 - Command and Scripting Interpreter, as the successful exploitation would likely involve command execution and potential credential compromise.
Mitigation strategies for CVE-2003-0122 focus primarily on applying vendor-supplied patches and implementing network-level protections. IBM released updates addressing this vulnerability in Lotus Notes R5.0.11 and subsequent releases, making patch deployment the most effective immediate solution for organizations maintaining affected versions. Network segmentation and access control measures should be implemented to limit exposure of Notes servers to untrusted networks, reducing the attack surface available to potential exploiters. Organizations should also consider implementing intrusion detection systems capable of identifying malformed NotesRPC requests that could indicate exploitation attempts. Additionally, monitoring for unusual authentication patterns and implementing strict input validation at network boundaries can help detect and prevent exploitation attempts. The vulnerability's age and well-documented nature mean that many security tools and frameworks, including those aligned with NIST SP 800-53 security controls, can be leveraged to identify affected systems and enforce remediation measures. Regular vulnerability assessments and security audits should be conducted to ensure that all Notes server implementations maintain current patch levels and that legacy systems are properly migrated or isolated from production environments to prevent exploitation of known vulnerabilities.