CVE-2002-1056 in Word
Summary
by MITRE
Microsoft Outlook 2000 and 2002, when configured to use Microsoft Word as the email editor, does not block scripts that are used while editing email messages in HTML or Rich Text Format (RTF), which could allow remote attackers to execute arbitrary scripts via an email that the user forwards or replies to.
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Analysis
by VulDB Data Team • 09/10/2025
This vulnerability exists in Microsoft Outlook 2000 and 2002 email clients when configured to use Microsoft Word as the email editor component. The flaw stems from insufficient input validation and script execution controls within the email composition environment, specifically when processing HTML or Rich Text Format content. The vulnerability is classified under CWE-94, which addresses "Improper Control of Generation of Code," indicating a failure to properly control code generation or execution within the application's email handling mechanisms. When a user receives an email containing malicious scripts and subsequently forwards or replies to it, the Word editor component processes these scripts without adequate sandboxing or execution restrictions, creating a significant security risk.
The technical implementation of this vulnerability exploits the integration between Outlook's email processing and Word's document editing capabilities. When users interact with HTML or RTF formatted emails, the underlying Word engine executes embedded scripts without proper security boundaries. This occurs because the Outlook client fails to implement proper script isolation mechanisms that would normally be present in web browsers or other script execution environments. The vulnerability specifically targets the email editor configuration where Word serves as the rendering engine for rich content, creating a pathway for remote code execution through maliciously crafted email messages. Attackers can embed malicious scripts within email headers, body content, or attachments that are processed by the Word editor component, bypassing standard email security measures.
The operational impact of this vulnerability is severe as it allows remote attackers to execute arbitrary code on vulnerable systems without requiring user interaction beyond receiving and interacting with the malicious email. The attack vector is particularly dangerous because it leverages legitimate user workflows such as forwarding or replying to emails, which are common actions that users perform without suspicion. This vulnerability effectively transforms the email client into an attack surface where malicious scripts can gain full access to the user's system, potentially leading to complete system compromise, data theft, or further network infiltration. The risk is amplified by the widespread deployment of these Outlook versions in corporate environments where users frequently forward important business communications, making the attack surface particularly large.
Mitigation strategies for this vulnerability should focus on both immediate defensive measures and long-term architectural improvements. Organizations should immediately disable the integration between Outlook and Word for email editing or configure Outlook to use the default text editor instead of Word's rich text capabilities. Security patches from Microsoft should be applied promptly, as this vulnerability was addressed through updates that implemented proper script blocking mechanisms. Network-level defenses should include email filtering solutions that can detect and quarantine emails containing potentially malicious embedded scripts. The mitigation approach aligns with ATT&CK technique T1193, which addresses "Spearphishing Attachment" by implementing email security controls, and T1059, which covers "Command and Scripting Interpreter" through proper script execution controls. Additionally, user education regarding the dangers of forwarding or replying to suspicious emails remains crucial in reducing the attack surface and preventing successful exploitation of this vulnerability.