CVE-2001-0501 in Word
Summary
by MITRE
Microsoft Word 2002 and earlier allows attackers to automatically execute macros without warning the user by embedding the macros in a manner that escapes detection by the security scanner.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 10/06/2025
This vulnerability resides in Microsoft Word 2002 and earlier versions where the application fails to properly validate macro content within documents, creating a significant security risk that directly impacts the integrity of user systems. The flaw specifically manifests when macros are embedded within Word documents using techniques that bypass the built-in security mechanisms designed to detect and warn users about potentially malicious code execution. This vulnerability represents a critical failure in the application's security model, as it allows attackers to circumvent the standard macro security warnings that users would normally receive when opening documents containing executable code. The security scanner functionality that should identify and block suspicious macro content becomes ineffective due to the obfuscation techniques employed by attackers.
The technical implementation of this vulnerability involves the manipulation of document structure and macro embedding methods that exploit weaknesses in Microsoft Word's document parsing and macro validation routines. Attackers can craft documents that contain malicious macros which are designed to execute automatically without any user notification or consent, effectively bypassing the security model that was intended to protect users from potentially harmful code execution. This particular vulnerability falls under the category of code injection and privilege escalation as defined by CWE-94, where untrusted code is executed within the context of the application without proper validation or user awareness. The exploitation mechanism relies on the application's failure to properly sanitize macro content during document loading and processing phases.
The operational impact of this vulnerability is severe and far-reaching, as it enables attackers to execute arbitrary code on vulnerable systems with the privileges of the user running Word. This creates a pathway for malware deployment, credential theft, and system compromise without requiring any user interaction beyond opening a malicious document. The vulnerability essentially undermines the fundamental security principle of user consent and awareness that is central to macro security models in office applications. Once a user opens a compromised document, the malicious macro executes automatically, potentially leading to complete system compromise, data exfiltration, or the installation of backdoors. The risk is particularly elevated because the user receives no warning or prompt to confirm the macro execution, making this attack vector highly effective for social engineering campaigns.
Organizations and individuals using vulnerable versions of Microsoft Word face significant exposure to targeted attacks that exploit this weakness in document security. The vulnerability is particularly dangerous because it can be easily weaponized through phishing campaigns, where attackers send malicious documents that automatically execute upon opening, bypassing traditional security controls. Mitigation strategies should include immediate patching of Microsoft Word installations to versions that properly address this macro validation issue, as well as implementing additional security controls such as disabling macro execution entirely in email clients and office applications. Organizations should also consider implementing application whitelisting policies and network-level security controls to prevent the automatic execution of macros in documents from untrusted sources. The vulnerability demonstrates the importance of maintaining up-to-date software and highlights the critical need for robust document security validation mechanisms as outlined in the ATT&CK framework's execution techniques, particularly those related to macro and script execution in office applications.