CVE-2008-4841 in Windows
Summary
by MITRE
The WordPad Text Converter for Word 97 files in Microsoft Windows 2000 SP4, XP SP2, and Server 2003 SP1 and SP2 allows remote attackers to execute arbitrary code via a crafted (1) .doc, (2) .wri, or (3) .rtf Word 97 file that triggers memory corruption, as exploited in the wild in December 2008. NOTE: As of 20081210, it is unclear whether this vulnerability is related to a WordPad issue disclosed on 20080925 with a 2008-crash.doc.rar example, but there are insufficient details to be sure.
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Analysis
by VulDB Data Team • 11/04/2024
This vulnerability represents a critical remote code execution flaw in Microsoft Windows operating systems that affects the WordPad Text Converter component used for processing legacy Word 97 file formats. The vulnerability specifically targets Windows 2000 Service Pack 4, Windows XP Service Pack 2, and Windows Server 2003 Service Packs 1 and 2, making it particularly significant as these were widely deployed enterprise operating systems during the late 2000s. The flaw manifests when the system processes specially crafted files with extensions .doc, .wri, or .rtf that contain maliciously constructed data structures designed to trigger memory corruption during the conversion process.
The technical mechanism behind this vulnerability involves improper input validation and memory handling within the WordPad Text Converter module. When a user opens or processes a maliciously crafted Word 97 file, the converter attempts to parse the file structure and convert it to a format suitable for display or further processing. The malicious payload is constructed in such a way that it exploits buffer overflow conditions or other memory corruption vulnerabilities that occur during parsing operations. This memory corruption allows attackers to overwrite critical memory locations and ultimately execute arbitrary code with the privileges of the affected user, typically resulting in complete system compromise.
The operational impact of this vulnerability extends beyond simple code execution as it represents a sophisticated attack vector that could be exploited in the wild without user interaction in many scenarios. Attackers could distribute malicious files through email attachments, web downloads, or compromised websites, and users who opened these files would unknowingly execute code on their systems. The vulnerability's exploitation in December 2008 demonstrates its real-world significance and the urgency with which organizations needed to address it. The fact that it was exploited in the wild within months of discovery indicates that attackers had developed reliable exploitation techniques and likely weaponized the vulnerability for mass deployment.
From a cybersecurity perspective, this vulnerability maps directly to several key concepts in the Common Weakness Enumeration framework, particularly CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities. The attack pattern aligns with the ATT&CK framework's technique T1059, which involves executing malicious code through legitimate system processes, and T1203, which involves using malicious documents to gain initial access. Organizations affected by this vulnerability faced significant risk as the exploit could lead to complete system compromise, data exfiltration, and potential lateral movement within network environments. The vulnerability's presence in multiple service packs of Windows 2000 and Windows XP made it particularly challenging to remediate across enterprise environments where these operating systems were still in widespread use.
Mitigation strategies for this vulnerability required immediate patch deployment through Microsoft's security updates, which addressed the underlying memory corruption issues in the WordPad Text Converter. Organizations needed to implement comprehensive patch management procedures and consider alternative file processing methods for legacy documents. Network segmentation and email filtering solutions became essential defensive measures to prevent the delivery of malicious documents to user systems. Additionally, user education regarding the dangers of opening unexpected document attachments became critical, as social engineering remained a primary attack vector for exploiting such vulnerabilities. The incident highlighted the importance of maintaining up-to-date security patches and implementing layered defensive strategies to protect against sophisticated zero-day exploits that could be weaponized for widespread attacks.