CVE-2022-47213: Microsoft 365 Apps RCE Vulnerability

CVE-2022-47213 Overview

CVE-2022-47213 is a Remote Code Execution vulnerability affecting the Microsoft Office Graphics component. This flaw allows an attacker to execute arbitrary code on the target system when a user opens a specially crafted file. The vulnerability requires user interaction, typically through social engineering tactics such as phishing emails containing malicious Office documents.

Critical Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code with the same privileges as the current user, potentially leading to full system compromise if the user has administrative rights.

Affected Products

• Microsoft 365 Apps for Enterprise

Discovery Timeline

• December 13, 2022 - CVE-2022-47213 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2022-47213

Vulnerability Analysis

This Remote Code Execution vulnerability exists within the Microsoft Office Graphics component. The flaw can be exploited through a local attack vector, requiring user interaction to trigger. When a victim opens a malicious document, the crafted content is processed by the graphics rendering engine, leading to code execution within the context of the current user.

The attack requires no prior privileges on the system but does require convincing a user to open a specially crafted file. This makes the vulnerability particularly dangerous in enterprise environments where phishing attacks targeting employees are common.

Root Cause

While Microsoft has not disclosed the specific technical root cause (classified as NVD-CWE-noinfo), the vulnerability resides in how Office Graphics processes certain document elements. The graphics rendering component fails to properly validate or handle malformed input, creating an exploitable condition that can be leveraged for code execution.

Attack Vector

The attack vector for CVE-2022-47213 is local, meaning an attacker must deliver a malicious file to the victim's system. Common delivery methods include:

• Phishing emails with malicious Office document attachments
• Hosting malicious documents on compromised or attacker-controlled websites
• Distribution through file-sharing platforms or internal network shares

Once the victim opens the malicious document, the exploit triggers without any additional user interaction beyond the initial file opening. The vulnerability does not require elevated privileges, making it accessible to attackers targeting standard user accounts.

The exploitation mechanism targets the Office Graphics rendering pipeline. For detailed technical information, see the Microsoft Security Update Guide for CVE-2022-47213.

Detection Methods for CVE-2022-47213

Indicators of Compromise

• Unusual Office application crashes or unexpected behavior when opening documents
• Suspicious child processes spawned from Microsoft Office applications (e.g., WINWORD.EXE, EXCEL.EXE, POWERPNT.EXE)
• Unexpected network connections originating from Office applications
• Anomalous file system activity following document opening operations

Detection Strategies

• Monitor for Office applications spawning unexpected child processes such as cmd.exe, powershell.exe, or wscript.exe
• Implement email gateway scanning to detect and quarantine suspicious Office documents before delivery
• Deploy endpoint detection rules to identify exploitation patterns associated with Office Graphics vulnerabilities
• Enable Windows Defender Exploit Guard and Attack Surface Reduction (ASR) rules for Office applications

Monitoring Recommendations

• Enable detailed logging for Microsoft Office applications and correlate with SIEM solutions
• Monitor for unusual registry modifications or file writes following Office document access
• Implement user behavior analytics to detect anomalous document access patterns
• Review email security logs for phishing attempts containing Office document attachments

How to Mitigate CVE-2022-47213

Immediate Actions Required

• Apply the latest security updates from Microsoft for Microsoft 365 Apps for Enterprise
• Enable Protected View for files originating from the internet or email attachments
• Educate users about the risks of opening unexpected Office documents
• Configure Application Guard for Office to isolate potentially malicious documents

Patch Information

Microsoft has released security updates to address this vulnerability. Administrators should apply the December 2022 security updates or later to remediate CVE-2022-47213. For complete patch details and installation guidance, refer to the Microsoft Security Update Guide for CVE-2022-47213.

Organizations using Microsoft 365 Apps for Enterprise should ensure automatic updates are enabled or deploy updates through their software management infrastructure.

Workarounds

• Enable Protected View for all Office documents to prevent automatic execution of potentially malicious content
• Block Office documents from untrusted sources at the email gateway and web proxy level
• Disable ActiveX and macros in Office applications where not required for business operations
• Consider using Application Guard for Office to open untrusted documents in an isolated container

# Enable Protected View via Group Policy
# Configure the following registry keys via GPO:
# HKCU\Software\Microsoft\Office\16.0\Word\Security\ProtectedView
# EnableWindowFromInternet = 1
# EnableAttachmentsFromUnsafeLocations = 1
# EnableUnsafeLocationsInPV = 1