CVE-2024-39388: Adobe Substance 3D Stager RCE Vulnerability

CVE-2024-39388 Overview

CVE-2024-39388 is a Use After Free vulnerability [CWE-416] affecting Adobe Substance 3D Stager versions 3.0.2 and earlier. Successful exploitation allows arbitrary code execution in the context of the current user. The vulnerability requires user interaction: a victim must open a malicious file crafted by an attacker.

Adobe published the vulnerability in security bulletin APSB24-60. The flaw affects installations on both Microsoft Windows and Apple macOS platforms. No public proof-of-concept exploit is currently available, and CISA has not added this CVE to the Known Exploited Vulnerabilities catalog.

Critical Impact
Arbitrary code execution as the logged-in user via a malicious file opened in Substance 3D Stager.

Affected Products

Adobe Substance 3D Stager versions 3.0.2 and earlier
Microsoft Windows installations of Substance 3D Stager
Apple macOS installations of Substance 3D Stager

Discovery Timeline

2024-08-14 - CVE-2024-39388 published to NVD
2024-08-14 - Adobe releases security bulletin APSB24-60
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-39388

Vulnerability Analysis

The vulnerability is a Use After Free condition [CWE-416] in Adobe Substance 3D Stager, a 3D scene composition and rendering application. Use After Free flaws occur when a program continues to reference memory after it has been freed. Attackers can manipulate the freed memory region to control program flow.

In this case, parsing a malicious project or asset file triggers the flawed memory handling path. An attacker who controls the freed object layout can redirect execution to attacker-supplied code. The result is arbitrary code execution under the privileges of the user running Substance 3D Stager.

Exploitation is local in nature because the attacker must deliver a crafted file that the victim then opens. Phishing, watermarked asset packs, or malicious downloads from 3D content marketplaces are plausible delivery vectors for creative professionals.

Root Cause

The root cause is improper object lifetime management inside the Substance 3D Stager file parsing components. A code path releases a memory allocation while other references to it remain valid. Subsequent operations dereference the stale pointer, giving an attacker who has groomed the heap the ability to hijack execution.

Attack Vector

The attack vector is local with required user interaction. An attacker crafts a malicious Substance 3D Stager project or asset file and delivers it via email, chat, cloud storage links, or compromised third-party asset repositories. When the victim opens the file in a vulnerable Substance 3D Stager build, the Use After Free triggers and arbitrary code executes at the user's privilege level.

Exploitation does not require elevated privileges on the target system, and no authentication to any network service is needed. However, the attacker cannot trigger the flaw remotely without a delivery mechanism that convinces the user to open the malicious file.

Detailed technical mechanics have not been published. Refer to the Adobe Security Update APSB24-60 for vendor guidance.

Detection Methods for CVE-2024-39388

Indicators of Compromise

Unexpected child processes spawned by Adobe Substance 3D Stager.exe on Windows or the Adobe Substance 3D Stager binary on macOS, particularly shells, script interpreters, or LOLBins.
Substance 3D Stager writing executable content, scripts, or scheduled tasks to user-writable directories such as %APPDATA%, %TEMP%, or ~/Library/LaunchAgents.
Substance 3D Stager processes initiating outbound network connections to previously unseen domains or IP addresses immediately after opening a file.

Detection Strategies

Inventory endpoints running Adobe Substance 3D Stager and flag any installation at version 3.0.2 or earlier for prioritized remediation.
Alert on Substance 3D Stager crashes that generate Windows Error Reporting entries or macOS crash logs referencing access violations, which may indicate exploitation attempts.
Correlate file-open telemetry with process behavior to identify malicious 3D asset files preceding suspicious child process creation.

Monitoring Recommendations

Monitor process ancestry involving Substance 3D Stager and alert on deviations from the normal parent-child tree.
Track file creations under user profile directories originating from Substance 3D Stager and treat executables or scripts as high-priority events.
Ingest endpoint telemetry into a centralized data lake to enable retroactive threat hunting once additional indicators for this CVE become available.

How to Mitigate CVE-2024-39388

Immediate Actions Required

Upgrade Adobe Substance 3D Stager to the fixed release identified in Adobe bulletin APSB24-60 on every Windows and macOS endpoint.
Instruct users not to open Substance 3D Stager project or asset files received from untrusted sources until the patch is deployed.
Restrict end-user accounts running Substance 3D Stager to standard, non-administrative privileges to limit the blast radius of successful exploitation.

Patch Information

Adobe released fixed builds of Substance 3D Stager as documented in the Adobe Security Update APSB24-60. Administrators should apply the vendor-supplied update to all affected installations. Verify the installed version through the application's About dialog or by querying software inventory tooling for versions above 3.0.2.

Workarounds

Where immediate patching is not possible, block the opening of Substance 3D Stager files that originate from external email attachments or unverified downloads.
Enable operating system exploit mitigations such as Data Execution Prevention and Control Flow Guard on Windows, and Hardened Runtime protections on macOS.
Use application allowlisting to prevent Substance 3D Stager from launching unexpected child processes such as cmd.exe, powershell.exe, bash, or osascript.

bash

# Query installed Substance 3D Stager version on Windows via PowerShell
Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* |
  Where-Object { $_.DisplayName -like 'Adobe Substance 3D Stager*' } |
  Select-Object DisplayName, DisplayVersion, InstallLocation

# Query installed Substance 3D Stager version on macOS
defaults read "/Applications/Adobe Substance 3D Stager/Adobe Substance 3D Stager.app/Contents/Info.plist" CFBundleShortVersionString