CVE-2008-2244 in Word
Summary
by MITRE
Microsoft Office Word 2002 SP3 allows remote attackers to execute arbitrary code via a .doc file that contains malformed data, as exploited in the wild in July 2008, and as demonstrated by attachement.doc.
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Analysis
by VulDB Data Team • 05/31/2025
This vulnerability represents a critical buffer overflow flaw in Microsoft Office Word 2002 SP3 that enables remote code execution through maliciously crafted .doc files. The vulnerability arises from insufficient input validation when processing Word document structures, specifically in how the application handles malformed data within document headers and metadata sections. Attackers exploited this weakness by crafting specially designed .doc attachments that would trigger the buffer overflow when opened, allowing arbitrary code execution with the privileges of the logged-in user. The exploitation occurred in widespread phishing campaigns during July 2008, where victims received email attachments named attachment.doc that contained the malicious payload. This vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and aligns with ATT&CK technique T1203, involving exploitation of remote services through malicious document attachments. The flaw was particularly dangerous because it required no user interaction beyond opening the document, making it an ideal vector for zero-day attacks. The vulnerability was present in Word 2002 SP3 and earlier versions, where the application failed to properly validate the length of data structures during document parsing, leading to memory corruption that could be leveraged for code execution.
The technical implementation of this vulnerability involves the manipulation of Word's document object model where the application parses document headers and embedded metadata without adequate bounds checking. When processing the malicious .doc file, the parser encounters malformed data structures that exceed allocated buffer sizes, causing memory corruption that can be controlled to redirect execution flow. The attack typically involves crafting a document with oversized fields in the Word document structure, particularly in the file header or document properties sections. This allows attackers to overwrite adjacent memory locations with malicious shellcode, which gets executed when the document is opened. The vulnerability's exploitation requires precise control over the memory layout and can be achieved through techniques such as return-oriented programming or direct code injection. The affected Word 2002 SP3 implementation lacked proper input sanitization and memory bounds checking, making it susceptible to this type of attack vector. Security researchers noted that the vulnerability could be triggered through multiple attack vectors including email attachments, web downloads, and file sharing scenarios where users might open the malicious document.
The operational impact of this vulnerability was severe and widespread, as it enabled attackers to compromise systems remotely without requiring any special privileges or user interaction beyond opening the malicious document. The exploitation resulted in full system compromise, allowing attackers to install malware, steal sensitive information, or establish persistent backdoors. The vulnerability was actively exploited in the wild during the summer of 2008, with security vendors reporting numerous incidents of successful compromises. Organizations running Word 2002 SP3 were particularly vulnerable as the application was widely deployed in enterprise environments, making the attack surface extensive. The vulnerability's impact extended beyond individual users to entire organizations, as a single compromised system could serve as a foothold for lateral movement within networks. Security teams had to implement immediate mitigation strategies including email filtering, document access restrictions, and user education to prevent exploitation. The incident highlighted the importance of keeping software updated and the dangers of running outdated applications with known vulnerabilities in production environments. Many organizations had to urgently patch their systems or isolate affected machines to prevent further exploitation attempts.
The recommended mitigations for this vulnerability include immediate installation of Microsoft security patches and updates that address the buffer overflow condition in Word 2002 SP3. Organizations should implement strict document filtering policies that prevent execution of potentially malicious attachments, particularly .doc files from untrusted sources. Network administrators should deploy email security solutions that can detect and block suspicious document attachments before they reach end users. Users should be educated about the risks of opening unexpected email attachments and the importance of verifying document sources before opening them. System administrators should consider implementing application whitelisting policies that restrict execution of Office applications unless explicitly permitted. Additional defensive measures include disabling macro execution in Office applications, implementing sandboxing for document processing, and monitoring for unusual document access patterns. The vulnerability also underscores the importance of maintaining up-to-date security patches and the need for regular vulnerability assessments to identify and remediate similar issues in other software applications. Organizations should also consider implementing network segmentation to limit the potential impact of successful exploitation attempts.