CVE-2025-43570 in Substance3D
Summary
by MITRE • 05/14/2025
Substance3D - Stager versions 3.1.1 and earlier are affected by a Use After Free vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
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Analysis
by VulDB Data Team • 05/17/2025
The vulnerability identified as CVE-2025-43570 affects Substance3D Stager versions 3.1.1 and earlier, representing a critical use after free flaw that enables remote code execution under specific conditions. This vulnerability resides within the software's memory management mechanisms where freed memory blocks are still accessed by subsequent operations, creating a dangerous state that malicious actors can exploit to execute arbitrary code with the privileges of the currently logged-in user. The flaw specifically impacts the stager component of Substance3D, which serves as the initial deployment mechanism for Substance3D applications and plugins.
The technical implementation of this use after free vulnerability occurs when the stager processes certain file formats that contain malformed or crafted data structures. When the application parses these malicious inputs, it allocates memory for specific objects and subsequently frees them during normal processing flow. However, due to improper memory management controls, the application continues to reference these freed memory locations, leading to unpredictable behavior that can be leveraged by attackers to inject and execute malicious code. This type of vulnerability is classified under CWE-416 as Use After Free, which is a well-known class of memory safety issues that has been extensively documented in cybersecurity literature and represents a significant threat vector in modern software applications.
The operational impact of this vulnerability is particularly concerning as it requires only user interaction to achieve successful exploitation, making it highly dangerous in real-world scenarios. Attackers can craft malicious files that, when opened by an unsuspecting user, trigger the vulnerable code path within the Substance3D Stager. This user interaction requirement significantly increases the attack surface compared to fully automated exploits, as it can be delivered through various vectors including email attachments, web downloads, or file sharing platforms. The exploitation chain typically involves creating a specially crafted file that, when processed by the vulnerable stager, causes the application to execute malicious code within the user's security context, potentially leading to complete system compromise.
The attack vector for this vulnerability aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, as it allows attackers to execute arbitrary commands through the compromised application. The attack can potentially progress through techniques such as T1566 for Phishing and T1078 for Valid Accounts, as the exploitation relies on user interaction and operates with the privileges of the legitimate user. Organizations using Substance3D Stager versions 3.1.1 or earlier face significant risk as this vulnerability can be exploited by threat actors to establish persistent access, escalate privileges, or deploy additional malware components. The vulnerability's impact extends beyond immediate code execution as it can serve as a foothold for more sophisticated attacks, including lateral movement within networks and data exfiltration operations.
Mitigation strategies for CVE-2025-43570 should prioritize immediate patching of affected systems to the latest available versions of Substance3D Stager that contain fixes for the use after free vulnerability. System administrators should implement strict file validation and scanning procedures for all incoming files, particularly those originating from untrusted sources or external networks. Additionally, organizations should consider implementing application whitelisting policies to restrict execution of unauthorized software, combined with user education programs to raise awareness about the risks of opening unknown or suspicious files. Network monitoring solutions should be configured to detect anomalous behavior patterns that may indicate exploitation attempts, while endpoint protection mechanisms should be enhanced to provide real-time detection of suspicious memory access patterns that could indicate use after free exploitation attempts.