CVE-2017-2903 in 3d Creation Suite
Summary
by MITRE
An exploitable integer overflow exists in the DPX loading functionality of the Blender open-source 3d creation suite version 2.78c. A specially crafted '.cin' 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 use the file as an asset via the sequencer in order to trigger this vulnerability.
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Analysis
by VulDB Data Team • 03/07/2023
The vulnerability identified as CVE-2017-2903 represents a critical security flaw within the Blender 3D creation suite version 2.78c, specifically affecting the Digital Picture eXchange (DPX) file loading functionality. This integer overflow vulnerability stems from inadequate input validation when processing '.cin' files, which are commonly used in digital cinema and visual effects workflows. The flaw exists in the application's handling of image data structures where insufficient bounds checking allows maliciously crafted file headers to manipulate integer values beyond their intended ranges. The vulnerability is particularly concerning as it affects a widely used open-source software tool that serves as a foundation for professional 3D content creation and animation production.
The technical implementation of this vulnerability involves an integer overflow condition that occurs during the parsing of DPX file headers, specifically when processing image dimensions and data offsets. When a specially crafted '.cin' file is loaded through Blender's sequencer interface, the application's memory management system fails to properly validate the integer values representing image buffer sizes. This overflow condition results in a subsequent buffer overflow that can be exploited to overwrite adjacent memory locations. The flaw operates through a classic integer arithmetic overflow pattern where the multiplication of image width and height values produces a result that exceeds the maximum value that can be represented by the target integer type, leading to unexpected behavior in memory allocation and data handling. This type of vulnerability is classified under CWE-190 as an integer overflow condition and can be mapped to ATT&CK technique T1203 for legitimate program exploitation.
The operational impact of this vulnerability extends beyond simple application instability, as it enables remote code execution under the privileges of the running Blender process. An attacker who can convince a user to load a malicious '.cin' file through Blender's sequencer interface gains the ability to execute arbitrary code on the target system. This creates a significant risk in professional environments where Blender is used for collaborative projects, as a single compromised asset file can compromise an entire production pipeline. The attack vector is particularly insidious because it leverages social engineering tactics to convince users to open legitimate-looking asset files, making it difficult to detect and prevent. The vulnerability affects users who are actively engaged in 3D animation, visual effects, and digital content creation workflows where such files are commonly exchanged and integrated into projects.
Mitigation strategies for CVE-2017-2903 require immediate action through software updates and operational security measures. The primary solution involves upgrading to Blender version 2.79 or later, where the integer overflow vulnerability has been addressed through proper input validation and bounds checking mechanisms. Organizations should implement strict file validation procedures for all assets entering their production pipelines, including automated scanning for potentially malicious file structures. Security teams should also consider implementing network-based restrictions on file type handling and establishing secure file transfer protocols that prevent unauthorized file injection. Additionally, user education programs should emphasize the importance of verifying file sources and avoiding the use of untrusted asset files, particularly those received through email attachments or unverified online sources. System administrators should monitor for unusual file processing patterns and implement application whitelisting controls to prevent exploitation of similar vulnerabilities in other software components. The vulnerability demonstrates the importance of maintaining up-to-date software versions and implementing robust input validation practices across all multimedia processing applications.