CVE-2005-0558 in Word
Summary
by MITRE
Buffer overflow in Microsoft Word 2000, Word 2002, and Word 2003 allows remote attackers to execute arbitrary code via a crafted document.
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Analysis
by VulDB Data Team • 05/31/2019
This vulnerability represents a critical buffer overflow flaw in Microsoft Word versions 2000, 2002, and 2003 that enables remote code execution through maliciously crafted documents. The vulnerability stems from insufficient input validation when processing specific document formats, particularly those containing malformed data structures that exceed allocated buffer boundaries. Attackers can exploit this weakness by crafting specially designed Word documents that, when opened by an affected version, trigger memory corruption leading to arbitrary code execution. The flaw operates at the application layer and leverages the inherent trust users place in document files, making it particularly dangerous in enterprise environments where document sharing is common.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The attack vector requires the target to open a malicious document, making it a classic example of a remote code execution vulnerability that can be delivered through email attachments, web downloads, or file sharing systems. The exploitation process typically involves crafting a document with oversized data fields that overwrite adjacent memory locations, potentially allowing attackers to inject and execute malicious code with the privileges of the affected user. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1203, which covers exploitation for execution, and T1059, which covers command and scripting interpreter.
The operational impact of CVE-2005-0558 extends beyond individual system compromise to potentially enable broader network infiltration and lateral movement within compromised environments. Once an attacker gains execution control through this vulnerability, they can establish persistent access, escalate privileges, or use the compromised system as a launch point for additional attacks. The widespread deployment of affected Word versions in corporate networks means that successful exploitation could affect hundreds or thousands of systems simultaneously, particularly in organizations that maintain legacy software environments. Organizations with insufficient patch management processes face heightened risk as the vulnerability remains exploitable for extended periods after initial discovery.
Mitigation strategies should prioritize immediate patch deployment through Microsoft's security updates, which address the underlying buffer overflow conditions in affected Word versions. System administrators should implement strict document validation policies, including email filtering and document preview restrictions, to prevent automatic execution of potentially malicious files. Network segmentation and privilege separation can limit the potential impact of successful exploitation by reducing the attack surface and preventing lateral movement. Additionally, user education regarding suspicious document attachments and the importance of keeping software updated remains crucial in defending against this class of vulnerability. Organizations should also consider implementing application whitelisting policies that restrict execution of untrusted documents and maintain comprehensive monitoring for suspicious file access patterns that might indicate exploitation attempts.