CVE-2017-0003 in Word
Summary
by MITRE
Microsoft Word 2016 and SharePoint Enterprise Server 2016 allow remote attackers to execute arbitrary code via a crafted document, aka "Microsoft Office Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 04/20/2025
The vulnerability identified as CVE-2017-0003 represents a critical memory corruption flaw affecting Microsoft Word 2016 and SharePoint Enterprise Server 2016 products. This vulnerability stems from improper handling of specially crafted documents that contain malformed data structures, leading to unpredictable memory behavior during document processing. The flaw exists in the way these Microsoft applications parse and render certain document elements, creating opportunities for attackers to manipulate memory contents through carefully constructed input files. Security researchers have classified this issue under CWE-125, which describes "Out-of-bounds Read" conditions that can lead to memory corruption and arbitrary code execution. The vulnerability demonstrates characteristics consistent with heap-based buffer overflow conditions where attacker-controlled data can overwrite adjacent memory locations, potentially allowing for privilege escalation and system compromise.
The technical exploitation of this vulnerability occurs when a user opens or previews a maliciously crafted document within Microsoft Word 2016 or when SharePoint Server 2016 processes certain document content. Attackers can construct documents containing specially formatted data that triggers memory corruption during parsing operations, particularly when the software attempts to render complex formatting or embedded objects. The memory corruption typically manifests as stack or heap corruption that can be leveraged to overwrite function pointers, return addresses, or other critical program state information. This vulnerability aligns with ATT&CK technique T1203, "Exploitation for Client Execution," as it enables remote code execution through document-based attacks. The flaw particularly affects the document rendering engine and memory management components that handle various file formats including docx, doc, and other Microsoft Office document types.
The operational impact of CVE-2017-0003 extends beyond individual system compromise to potentially enable large-scale attacks within enterprise environments where SharePoint servers serve as document repositories. Organizations running affected versions of Microsoft Office and SharePoint are at risk of unauthorized access, data exfiltration, and persistent threat presence. The vulnerability's remote exploitation capability means attackers do not require physical access to target systems, making it particularly dangerous in networked environments. Security professionals should note that successful exploitation can lead to complete system compromise, allowing attackers to establish backdoors, escalate privileges, or deploy additional malicious payloads. The vulnerability affects both client-side applications and server-side components, creating multiple attack vectors that can be leveraged in targeted campaigns. Organizations with extensive SharePoint deployments face heightened risk due to the server-side processing capabilities that can be exploited through document uploads or previews.
Mitigation strategies for CVE-2017-0003 should encompass both immediate patching and defensive measures to reduce attack surface. Microsoft released security updates addressing this vulnerability through regular monthly patches, and organizations should prioritize applying these updates to all affected systems. Network-based defenses should include implementing document filtering at perimeter security devices to block suspicious file types or malformed documents before they reach end-user systems. Email security solutions should be configured to scan incoming documents for known malicious patterns or suspicious structures that could indicate exploitation attempts. Additionally, implementing application whitelisting policies can prevent unauthorized document processing applications from executing on target systems. Security teams should monitor for indicators of compromise related to this vulnerability, including unusual network connections, unexpected process execution, or anomalous memory usage patterns. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies to protect against memory corruption exploits. Regular security assessments should verify that all Microsoft Office and SharePoint installations are properly updated and that appropriate security configurations are in place to prevent exploitation of similar vulnerabilities.