CVE-2017-2908 in 3d Creation Suite
Summary
by MITRE
An exploitable integer overflow exists in the thumbnail functionality of the Blender open-source 3d creation suite version 2.78c. A specially crafted .blend file can cause an integer overflow resulting in a buffer overflow which can allow for code execution under the context of the application. An attacker can convince a user to render the thumbnail for the file while in the File->Open dialog.
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Analysis
by VulDB Data Team • 03/07/2023
The vulnerability identified as CVE-2017-2908 represents a critical security flaw within the Blender 3d creation suite version 2.78c that demonstrates the intersection of integer arithmetic errors and memory safety issues in creative software applications. This vulnerability specifically targets the thumbnail generation functionality that occurs when users interact with the File->Open dialog interface, making it particularly dangerous as it can be exploited through routine user activities. The flaw stems from improper handling of integer values during the processing of .blend files, which are Blender's native file format used for storing 3d scenes, animations, and related data structures. When a maliciously crafted .blend file is processed, the application's thumbnail rendering system fails to properly validate input parameters, creating a scenario where integer overflow conditions can be triggered.
The technical implementation of this vulnerability involves an integer overflow occurring within the thumbnail generation code path that ultimately leads to a buffer overflow condition. During the processing of the .blend file, the application attempts to calculate memory requirements for thumbnail rendering based on input values from the file's metadata or content structures. When these values exceed the maximum representable integer limits, the overflow causes subsequent calculations to produce incorrect memory allocation sizes. This misalignment between expected and actual memory allocation creates opportunities for attackers to manipulate memory layout and potentially execute arbitrary code within the application's security context. The vulnerability operates at the intersection of multiple security concerns including integer overflows, buffer overflows, and privilege escalation scenarios, making it particularly dangerous for users who regularly handle third-party 3d content files.
The operational impact of CVE-2017-2908 extends beyond simple code execution capabilities to encompass broader security implications for creative professionals and organizations that rely on Blender for their 3d content workflows. Attackers can exploit this vulnerability by crafting malicious .blend files that appear legitimate to users, leveraging social engineering techniques to convince victims to open these files through the standard File->Open dialog. The attack vector is particularly insidious because it requires no special privileges or advanced technical knowledge from the attacker, and the exploitation occurs during routine software usage patterns. This makes the vulnerability highly relevant to the attack surface analysis framework, as it demonstrates how seemingly benign functionality can become a critical security weakness when proper input validation is absent. The vulnerability also aligns with common attack patterns documented in the attack tree methodology, where a simple file opening operation becomes a potential entry point for more sophisticated attacks.
Mitigation strategies for this vulnerability should focus on immediate remediation through software updates and comprehensive input validation measures. The most effective immediate solution involves upgrading to a patched version of Blender that addresses the integer overflow conditions in the thumbnail processing code. Organizations should also implement security awareness training to educate users about the risks of opening untrusted .blend files and the importance of verifying file sources before processing. Additionally, system administrators should consider implementing file type restrictions and content scanning mechanisms for .blend files in enterprise environments where Blender is widely used. From a defensive perspective, the vulnerability highlights the importance of applying the principle of least privilege when running creative applications, as well as implementing application sandboxing techniques that limit the potential impact of successful exploits. The vulnerability also serves as a reminder of the critical need for robust integer overflow protection mechanisms in software applications, particularly those handling user-supplied data through complex parsing and rendering workflows, aligning with security standards such as those outlined in the CWE-190 category for integer overflow conditions.