CVE-2024-49032: Microsoft 365 Apps RCE Vulnerability

CVE-2024-49032 Overview

CVE-2024-49032 is a remote code execution vulnerability affecting the graphics component of Microsoft Office. The flaw is classified as a use-after-free issue [CWE-416] and allows arbitrary code execution in the context of the current user. Exploitation requires user interaction, typically opening a malicious document, and attacks originate from the local vector. Microsoft addressed the issue in the November 2024 security update cycle. The vulnerability affects Microsoft 365 Apps, Microsoft Office 2016 and 2019, and Microsoft Office Long-Term Servicing Channel (LTSC) 2021 and 2024 on both Windows and macOS.

Critical Impact
Successful exploitation grants attackers the ability to execute arbitrary code with the privileges of the current user, enabling data theft, persistence, and lateral movement from workstations that open a crafted Office document.

Affected Products

Microsoft 365 Apps (Enterprise)
Microsoft Office 2016 and Microsoft Office 2019
Microsoft Office LTSC 2021 and 2024 (Windows and macOS)

Discovery Timeline

2024-11-12 - CVE-2024-49032 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-49032

Vulnerability Analysis

CVE-2024-49032 resides in the graphics rendering logic used by Microsoft Office when parsing embedded image or drawing objects. The root weakness is a use-after-free condition [CWE-416], where memory referenced by an internal object pointer is freed while another code path still holds a reference to it. When the dangling pointer is dereferenced during subsequent graphics processing, an attacker who controls the freed memory layout can redirect execution flow. The result is arbitrary code execution in the security context of the user opening the document.

The issue impacts the desktop Office suite across Windows and macOS builds, indicating the defect resides in shared cross-platform graphics parsing code rather than in a platform-specific renderer.

Root Cause

The underlying defect is improper object lifetime management in Office's graphics parser. A structured object is released without invalidating outstanding references, leaving a stale pointer available for later use. An attacker who shapes heap allocations between the free and the reuse can place controlled data at the reclaimed address.

Attack Vector

Exploitation is local and requires user interaction. An attacker crafts a malicious Office document containing a specially formed graphics object and delivers it through phishing, a shared drive, or a compromised web download. When the target opens the document in an affected Office version, the parser triggers the use-after-free and executes the attacker's payload. No elevated privileges are required at the time of exploitation, and the process gains the current user's rights.

The vulnerability description does not include public proof-of-concept code. Refer to the Microsoft Security Update Guide for vendor technical details.

Detection Methods for CVE-2024-49032

Indicators of Compromise

Office processes such as WINWORD.EXE, EXCEL.EXE, or POWERPNT.EXE spawning shell interpreters like cmd.exe, powershell.exe, or wscript.exe.
Unexpected child processes performing network callouts or writing executables to %APPDATA%, %TEMP%, or the user profile.
Office documents received via email or download containing embedded graphics objects with malformed image streams.

Detection Strategies

Hunt for anomalous parent-child process relationships originating from Office binaries, correlated with document open events.
Alert on Office applications loading unusual DLLs from user-writable directories or injecting into other processes.
Inspect email attachments and file share uploads for Office documents containing crafted graphics streams that trigger known parser paths.

Monitoring Recommendations

Enable process creation logging (Sysmon Event ID 1 or Windows Event ID 4688) with command-line auditing on all Office endpoints.
Forward endpoint telemetry to a centralized analytics platform to correlate document open events, process spawns, and outbound connections.
Track Office application crashes and Windows Error Reporting entries that may indicate exploitation attempts against the graphics component.

How to Mitigate CVE-2024-49032

Immediate Actions Required

Apply the November 2024 Microsoft security updates to all affected Microsoft 365 Apps, Office 2016, Office 2019, and Office LTSC 2021 and 2024 installations.
Inventory endpoints for outdated Office builds and prioritize patching of internet-facing users, executives, and privileged accounts.
Reinforce user awareness on opening unsolicited Office attachments and enabling content from unknown sources.

Patch Information

Microsoft released fixes for CVE-2024-49032 through the Microsoft Security Update Guide. Administrators should deploy the corresponding cumulative updates via Microsoft Update, WSUS, Intune, or Configuration Manager, and confirm build numbers post-installation.

Workarounds

Enforce Protected View and Office Application Guard for documents originating from the internet or email.
Block or strip Office attachments at the email gateway when senders are unauthenticated or unverified.
Apply Attack Surface Reduction (ASR) rules to prevent Office applications from creating child processes and injecting into other processes.

bash

# Enable Microsoft Defender ASR rule: Block Office apps from creating child processes
Set-MpPreference -AttackSurfaceReductionRules_Ids D4F940AB-401B-4EFC-AADC-AD5F3C50688A -AttackSurfaceReductionRules_Actions Enabled

# Enable ASR rule: Block Office apps from injecting code into other processes
Set-MpPreference -AttackSurfaceReductionRules_Ids 75668C1F-73B5-4CF0-BB93-3ECF5CB7CC84 -AttackSurfaceReductionRules_Actions Enabled