CVE-2017-8570 in Office
Summary
by MITRE
Microsoft Office allows a remote code execution vulnerability due to the way that it handles objects in memory, aka "Microsoft Office Remote Code Execution Vulnerability". This CVE ID is unique from CVE-2017-0243.
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Analysis
by VulDB Data Team • 02/10/2025
The vulnerability identified as CVE-2017-8570 represents a critical remote code execution flaw within Microsoft Office applications that stems from improper handling of objects in memory. This vulnerability specifically affects multiple versions of Microsoft Office including Word, Excel, and PowerPoint, making it a widespread concern across enterprise environments where these applications are commonly deployed. The flaw manifests when Office applications process specially crafted malicious files that contain malformed objects, leading to memory corruption that adversaries can exploit to execute arbitrary code on affected systems. This vulnerability operates at a fundamental level within the application's memory management system, where the Office suite fails to properly validate or sanitize object references during document processing operations.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions that occur when software reads data past the end of a valid buffer or array. Attackers can leverage this weakness by crafting malicious Office documents that contain specially constructed objects designed to trigger memory corruption when processed by vulnerable applications. The exploitation typically involves creating documents with malformed embedded objects or references that cause Office to allocate memory in unexpected ways, ultimately leading to controlled memory corruption that allows attackers to inject and execute malicious code. This type of vulnerability falls under the ATT&CK technique T1203, where adversaries use malicious documents to gain initial access and execute code remotely. The vulnerability is particularly dangerous because it can be triggered through routine document opening activities, making it difficult to defend against through traditional user awareness training alone.
The operational impact of CVE-2017-8570 extends beyond simple exploitation as it represents a significant threat to enterprise security infrastructure and data integrity. Organizations running affected versions of Microsoft Office face potential compromise of entire networks when users open malicious documents, as the vulnerability allows for privilege escalation and lateral movement within network environments. The remote code execution capability means that attackers can establish persistent backdoors, exfiltrate sensitive data, or deploy additional malware without requiring local system access. This vulnerability has been actively exploited in the wild, with threat actors targeting government agencies, financial institutions, and critical infrastructure organizations. The exploitability of this vulnerability is further amplified by the fact that it requires no user interaction beyond opening a malicious document, making it particularly dangerous for targeted attacks and advanced persistent threat campaigns.
Mitigation strategies for CVE-2017-8570 must address both immediate defensive measures and long-term security improvements within enterprise environments. Microsoft released security updates and patches in June 2017 that address this vulnerability through improved memory handling and object validation within Office applications. Organizations should prioritize immediate deployment of these patches across all affected systems, particularly those running older versions of Microsoft Office that remain vulnerable to exploitation. Additional defensive measures include implementing strict file validation policies, disabling automatic opening of attachments, and deploying application control solutions that can prevent execution of malicious Office documents. Network-based protections such as email filtering systems and web application firewalls should be configured to block suspicious Office file types and content. The vulnerability also highlights the importance of maintaining up-to-date security practices and regular vulnerability assessments to identify and remediate similar memory corruption issues that may exist in other Microsoft Office components or third-party applications. Organizations should also consider implementing sandboxing technologies and privileged access management solutions to limit the potential impact of successful exploitation attempts.