CVE-2017-8506 in Outlook
Summary
by MITRE
A remote code execution vulnerability exists in Microsoft Office when the software fails to properly handle objects in memory, aka "Office Remote Code Execution Vulnerability". This CVE ID is unique from CVE-2017-8509, CVE-2017-8510, CVE-2017-8511, CVE-2017-8512, and CVE-2017-0260.
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Analysis
by VulDB Data Team • 12/27/2020
The vulnerability identified as CVE-2017-8506 represents a critical remote code execution flaw within Microsoft Office applications that stems from improper handling of objects in memory. This vulnerability specifically affects Microsoft Office products including Word, Excel, and PowerPoint, making it a widespread concern across enterprise environments where these applications are extensively deployed. The flaw exists in the way Office processes certain file formats and memory structures, creating opportunities for attackers to execute arbitrary code on affected systems without requiring user interaction for initial exploitation. Security researchers have classified this issue as a memory corruption vulnerability that can be leveraged remotely, making it particularly dangerous in modern networked environments where Office documents are frequently shared and opened.
The technical mechanism behind CVE-2017-8506 involves a classic heap-based buffer overflow condition that occurs when Microsoft Office applications parse malformed Office document files. When an Office application encounters specially crafted objects within a document, the memory management routines fail to properly validate the size or structure of these objects, leading to memory corruption that can be exploited to overwrite critical memory locations. This memory corruption typically manifests through improper bounds checking during object deserialization or when processing embedded objects within Office files such as ole objects, xml structures, or embedded binary data. The vulnerability is particularly concerning because it can be triggered through various Office file formats including .doc, .xls, .ppt, and their newer .docx, .xlsx, .pptx counterparts, making it extremely difficult to contain within a single file type or application context. According to CWE classification, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and CWE-125, which addresses out-of-bounds read vulnerabilities that can lead to memory corruption.
The operational impact of CVE-2017-8506 extends far beyond simple code execution capabilities, as it provides attackers with the ability to gain full system control without user interaction. Once successfully exploited, the vulnerability allows threat actors to install malware, modify or delete files, create new user accounts, and establish persistence mechanisms within the compromised environment. This makes the vulnerability particularly attractive to advanced persistent threat groups and cybercriminal organizations who seek to establish long-term access to target networks. The remote nature of the exploit means that attackers can leverage this vulnerability through email attachments, web downloads, or even through compromised websites that deliver malicious Office documents to unsuspecting users. Organizations with legacy Office versions or those that have not applied security patches are particularly vulnerable to this attack vector, as the vulnerability affects multiple Office versions from 2007 through 2016, creating a wide attack surface that security teams must address.
Mitigation strategies for CVE-2017-8506 require a multi-layered approach combining immediate patch management with network-level defenses and user education. Microsoft released security patches for this vulnerability in their August 2017 security updates, and organizations should prioritize applying these patches across all affected Office installations. Network administrators should implement strict file validation policies, particularly for Office documents received through email or web channels, and consider deploying sandboxing solutions to isolate document processing. According to ATT&CK framework, this vulnerability maps to technique T1203, which describes exploitation of remote services, and T1059, which covers command and scripting interpreter usage. Organizations should also consider disabling macro execution in Office documents, implementing application whitelisting policies, and monitoring for suspicious file access patterns that could indicate exploitation attempts. Security teams should conduct regular vulnerability assessments focusing on Office applications and ensure that all users receive training on recognizing potentially malicious Office documents, as social engineering remains a critical component of successful exploitation campaigns for this vulnerability.