CVE-2004-1621 in Lotus Domino
Summary
by MITRE
** DISPUTED ** NOTE: this issue has been disputed by the vendor. Cross-site scripting (XSS) vulnerability in IBM Lotus Notes R6 and Domino R6, and possibly earlier versions, allows remote attackers to execute arbitrary web script or HTML via square brackets at the beginning and end of (1) computed for display, (2) computed when composed, or (3) computed text element fields. NOTE: the vendor has disputed this issue, saying that it is not a problem with Notes/Domino itself, but with the applications that do not properly handle this feature.
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Analysis
by VulDB Data Team • 07/05/2025
The vulnerability described in CVE-2004-1621 represents a disputed cross-site scripting issue within IBM Lotus Notes and Domino email systems. This vulnerability specifically affects versions R6 and potentially earlier releases of the software suite. The security concern arises from how the system processes computed fields in email messages, creating a potential attack vector for remote threat actors. The flaw manifests when square brackets are positioned at both the beginning and end of computed fields, which can contain text elements that are processed by the system. This particular vulnerability demonstrates how seemingly benign input handling can create significant security risks in enterprise email systems that process user-generated content.
The technical implementation of this vulnerability involves the improper sanitization of input within computed text elements in IBM Lotus Notes and Domino systems. When square brackets are present at the start and end of computed for display, computed when composed, or computed text element fields, the system's processing mechanism can be manipulated to execute arbitrary web scripts or HTML code. This behavior aligns with the common patterns of cross-site scripting vulnerabilities where user-controllable input is not properly escaped or filtered before being rendered in web contexts. The vulnerability operates at the application layer and can be classified under CWE-79 as "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')". The attack vector requires remote access and can be executed without authentication, making it particularly concerning for enterprise email environments where users frequently interact with email content from external sources.
The operational impact of this vulnerability extends beyond simple script execution, as it could potentially allow attackers to hijack user sessions, steal sensitive information, or redirect users to malicious websites. In enterprise environments using Lotus Notes and Domino, this vulnerability could compromise the security of internal communications and potentially provide attackers with access to sensitive business data. The disputed nature of this vulnerability by IBM suggests that the vendor believes the issue stems from improper implementation by third-party developers rather than fundamental flaws in the core software. However, from a cybersecurity perspective, this creates a complex situation where the responsibility for remediation becomes ambiguous, potentially leaving organizations vulnerable while they await clarification from the vendor. The vulnerability can be mapped to ATT&CK technique T1566.001 which involves the use of malicious content in email campaigns, and potentially T1059.007 for the execution of scripts through web interfaces.
The disputed status of this vulnerability highlights the complexity of security assessments in enterprise software environments where multiple layers of applications and configurations can contribute to security weaknesses. Organizations using IBM Lotus Notes and Domino systems should conduct thorough security assessments of their deployed applications to determine if they properly handle computed fields and input validation. The recommended mitigations include implementing strict input validation and sanitization measures within custom applications that utilize computed fields, as well as ensuring proper HTML escaping mechanisms are in place. Organizations should also consider network-level protections such as web application firewalls that can detect and block suspicious script execution patterns. The vulnerability underscores the importance of proper security testing and validation of custom applications built on enterprise platforms, as the core software may not inherently prevent all potential attack vectors introduced through application-specific implementations. Regular security audits and code reviews focusing on input handling within computed fields should be implemented as part of comprehensive security programs to prevent exploitation of similar vulnerabilities.