CVE-2022-38010: Microsoft Office Visio RCE Vulnerability

CVE-2022-38010 Overview

CVE-2022-38010 is a remote code execution vulnerability affecting Microsoft Office Visio. This vulnerability allows attackers to execute arbitrary code on affected systems when a user opens a specially crafted Visio file. The attack requires local access and user interaction, making it a potential vector for targeted phishing campaigns or malicious document delivery.

Critical Impact

Successful exploitation could allow an attacker to execute arbitrary code with the same privileges as the logged-in user, potentially leading to full system compromise, data theft, or lateral movement within an organization.

Affected Products

• Microsoft 365 Apps (Enterprise edition, both x64 and x86)
• Microsoft Office 2019 (x64 and x86)
• Microsoft Office Long Term Servicing Channel 2021 (x64 and x86)
• Microsoft Visio 2013 SP1
• Microsoft Visio 2016

Discovery Timeline

• September 13, 2022 - CVE-2022-38010 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-38010

Vulnerability Analysis

This remote code execution vulnerability in Microsoft Office Visio stems from improper handling of specially crafted files. When a user opens a malicious Visio document, the application fails to properly validate or sanitize certain elements within the file structure. This allows an attacker to craft a file that, when processed, triggers execution of arbitrary code in the context of the current user.

The local attack vector indicates that exploitation requires the attacker to either have direct access to the target system or to convince a user to open a malicious file delivered through other means such as email attachments, file sharing, or web downloads. The requirement for user interaction means that social engineering typically plays a role in successful attacks.

Root Cause

The vulnerability originates from insufficient input validation within the Visio file parsing engine. Microsoft has not disclosed specific technical details about the root cause, but remote code execution vulnerabilities in document processing applications typically involve memory corruption issues, type confusion, or improper handling of embedded objects within the file format.

Attack Vector

Exploitation of CVE-2022-38010 requires an attacker to deliver a specially crafted Visio file to a victim and convince them to open it. Attack scenarios include:

The attacker crafts a malicious .vsd, .vsdx, or other Visio-compatible file containing exploit code embedded within document structures. This file is then delivered to the target through email phishing, malicious websites, or compromised file shares. When the victim opens the document, the Visio application processes the malicious content, triggering code execution.

Since the vulnerability requires user interaction to open a malicious file, the attack surface is reduced compared to network-based exploits. However, the widespread use of Visio in enterprise environments for business process diagrams, flowcharts, and technical documentation makes this a significant risk for organizations that rely on Microsoft Office products.

Detection Methods for CVE-2022-38010

Indicators of Compromise

• Unexpected Visio processes spawning child processes (such as cmd.exe, powershell.exe, or script interpreters)
• Suspicious Visio file downloads from untrusted sources or unexpected email attachments
• Visio application crashes followed by unusual system behavior
• Network connections initiated by Visio or related Office processes to unknown external destinations

Detection Strategies

• Monitor for unusual process creation chains originating from visio.exe or visiod.exe
• Implement email gateway scanning for potentially malicious Visio file attachments
• Deploy endpoint detection rules to identify Visio spawning command shells or script interpreters
• Enable Microsoft Defender for Office 365 safe attachments and safe links features

Monitoring Recommendations

• Enable Windows Event Logging for process creation events (Event ID 4688) and correlate with Office application activity
• Configure SentinelOne Deep Visibility to monitor document-based attacks and suspicious Office process behaviors
• Implement file integrity monitoring for critical system directories that may be modified during exploitation
• Monitor for PowerShell or command-line activity initiated shortly after Visio file access

How to Mitigate CVE-2022-38010

Immediate Actions Required

• Apply Microsoft security updates released in September 2022 as part of Patch Tuesday
• Enable Microsoft Office Protected View to open potentially unsafe documents in a sandboxed environment
• Block Visio file attachments at email gateways from untrusted external sources until patching is complete
• Educate users about the risks of opening Visio files from unknown or untrusted sources

Patch Information

Microsoft addressed this vulnerability in the September 2022 security updates. Patches are available through Windows Update, Microsoft Update Catalog, and WSUS for enterprise deployments. Organizations should apply updates to all affected Microsoft Office and Visio installations immediately. For detailed patch information, refer to the Microsoft Security Update Guide for CVE-2022-38010.

Workarounds

• Enable Protected View in Microsoft Office applications to open documents from the internet or untrusted locations in read-only mode
• Configure Group Policy to block macros and ActiveX controls in documents from the internet
• Restrict Visio file downloads through web proxy policies until systems are patched
• Consider using Application Guard for Office to isolate potentially malicious documents in a containerized environment

# Enable Protected View via Registry for all users
reg add "HKLM\SOFTWARE\Policies\Microsoft\Office\16.0\Visio\Security\ProtectedView" /v DisableAttachmentsInPV /t REG_DWORD /d 0 /f
reg add "HKLM\SOFTWARE\Policies\Microsoft\Office\16.0\Visio\Security\ProtectedView" /v DisableInternetFilesInPV /t REG_DWORD /d 0 /f
reg add "HKLM\SOFTWARE\Policies\Microsoft\Office\16.0\Visio\Security\ProtectedView" /v DisableUnsafeLocationsInPV /t REG_DWORD /d 0 /f