CVE-2016-3362 in Office
Summary
by MITRE
Microsoft Excel 2007 SP3, Excel 2010 SP2, Excel 2013 SP1, Excel 2013 RT SP1, Excel 2016, Office Compatibility Pack SP3, Excel Viewer, Excel Services on SharePoint Server 2007 SP3, Excel Services on SharePoint Server 2010 SP2, Excel Automation Services on SharePoint Server 2013 SP1, and Office Online Server allow remote attackers to execute arbitrary code via a crafted document, aka "Microsoft Office Memory Corruption Vulnerability," a different vulnerability than CVE-2016-3365.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 09/16/2022
The vulnerability identified as CVE-2016-3362 represents a critical memory corruption flaw affecting multiple versions of Microsoft Excel and related Office products. This vulnerability falls under the category of heap-based buffer overflows that occur when the affected applications process specially crafted Excel files. The flaw manifests during the parsing of maliciously constructed spreadsheet documents, where improper input validation leads to memory corruption that can be exploited by remote attackers to execute arbitrary code on targeted systems. The vulnerability impacts a wide range of Microsoft Office products including Excel 2007 through Excel 2016, the Office Compatibility Pack, Excel Viewer, and various SharePoint Server implementations, making it particularly dangerous due to its widespread presence across enterprise environments.
The technical exploitation of this vulnerability leverages improper memory management during spreadsheet parsing operations, specifically when handling malformed or crafted Excel files. Attackers can construct malicious documents that trigger buffer overflow conditions when processed by vulnerable Excel applications, leading to memory corruption that allows code execution with the privileges of the targeted user. This type of vulnerability is classified as a CWE-121 heap-based buffer overflow, which is a common vector for privilege escalation attacks and remote code execution. The flaw exists in the parsing logic of Microsoft Office applications and is particularly concerning because it can be triggered through various attack vectors including email attachments, web downloads, and document sharing platforms that utilize Office applications for document viewing and processing.
The operational impact of CVE-2016-3362 extends beyond simple remote code execution to encompass significant security implications for enterprise environments. Organizations running affected versions of Microsoft Office are at risk of full system compromise when users open malicious documents, as the vulnerability can be exploited without requiring user interaction beyond document opening. The attack surface is particularly broad given that Excel is one of the most commonly used applications in enterprise settings, and the vulnerability can be exploited through multiple vectors including phishing emails, malicious websites, and compromised document repositories. This makes it a prime target for advanced persistent threat actors and cybercriminals seeking to establish persistent access to corporate networks. The vulnerability's classification under the MITRE ATT&CK framework as a remote code execution technique highlights its potential for lateral movement and privilege escalation within compromised networks.
Mitigation strategies for CVE-2016-3362 require immediate action from organizations to protect their systems from exploitation. Microsoft released security patches and updates to address this vulnerability, and organizations should prioritize applying these patches across all affected systems. Additional defensive measures include implementing strict email filtering and document validation policies, disabling automatic execution of Office applications when opening files from untrusted sources, and utilizing sandboxing technologies for document processing. Network segmentation and monitoring for suspicious file access patterns can help detect exploitation attempts, while user education regarding phishing awareness and safe document handling practices remains crucial. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies that include multiple layers of protection to prevent successful exploitation of memory corruption vulnerabilities. Organizations should also consider implementing application whitelisting policies to restrict execution of potentially malicious Office documents and regularly audit their Office application configurations to minimize exposure to this and similar vulnerabilities.