CVE-2016-3361 in Office
Summary
by MITRE
Microsoft Excel 2010 SP2 allows 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 • 09/16/2022
The vulnerability identified as CVE-2016-3361 represents a critical memory corruption flaw in Microsoft Excel 2010 Service Pack 2 that enables remote code execution through maliciously crafted Office documents. This vulnerability falls under the CWE-125 vulnerability type, which specifically addresses out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution. The flaw exists within the way Excel processes certain structured data within spreadsheet files, creating opportunities for attackers to manipulate memory layout and execute malicious payloads without user interaction.
The technical implementation of this vulnerability occurs when Excel encounters specially crafted spreadsheet elements that trigger buffer overflows or memory corruption during document parsing operations. Attackers can exploit this by embedding malicious code within seemingly legitimate Excel files, which when opened by vulnerable systems, initiate the exploitation sequence. The vulnerability specifically targets the memory management routines used for processing complex spreadsheet data structures, allowing attackers to overwrite critical memory locations and redirect execution flow. This type of exploitation aligns with ATT&CK technique T1203, which covers legitimate programs used for exploitation through memory corruption attacks.
The operational impact of CVE-2016-3361 extends far beyond simple remote code execution, as it provides attackers with persistent access to compromised systems and enables further reconnaissance and lateral movement within networks. Organizations running affected Excel versions face significant risk of data breaches, system compromise, and potential full network infiltration when users open malicious documents. The vulnerability's remote exploitation capability means that attackers can leverage it through email attachments, web downloads, or other delivery mechanisms without requiring physical access to target systems. This makes the vulnerability particularly dangerous in enterprise environments where users frequently open documents from external sources.
Mitigation strategies for CVE-2016-3361 should include immediate deployment of Microsoft security patches and updates, along with comprehensive network monitoring to detect suspicious document access patterns. Organizations should implement strict document validation policies, disable automatic opening of Office files from untrusted sources, and maintain up-to-date antivirus signatures that can detect known malicious Office document patterns. Additional protective measures include network segmentation, email filtering solutions that scan for malicious Office documents, and user education programs that emphasize the dangers of opening unknown or unexpected Office files. Security teams should also consider implementing application whitelisting policies that restrict execution of unauthorized Office file types and regularly audit system configurations to ensure proper patch management procedures are in place.