CVE-2017-12102 in 3d Creation Suite
Summary
by MITRE
An exploitable integer overflow exists in the way that the Blender open-source 3d creation suite v2.78c converts curves to polygons. 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 open the file or use the file as a library in order to trigger this vulnerability.
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Analysis
by VulDB Data Team • 09/01/2024
The vulnerability CVE-2017-12102 represents a critical integer overflow flaw in Blender version 2.78c that occurs during the conversion of curves to polygons within the open-source 3D creation suite. This issue stems from inadequate input validation and overflow checking in the curve processing algorithms that handle the mathematical conversion from smooth curves to discrete polygonal representations. The flaw manifests when Blender processes specially crafted .blend files that contain malformed curve data, specifically in the way it calculates memory allocation for polygon arrays during the conversion process.
The technical implementation of this vulnerability involves a classic integer overflow condition where the application fails to properly validate the size calculations required for converting curve segments into polygon vertices. When processing certain curve data structures, the application performs arithmetic operations that exceed the maximum representable value for the integer type used in memory allocation calculations. This overflow results in a significantly smaller allocated buffer than required, creating a condition where subsequent memory writes exceed the allocated bounds, leading to a predictable buffer overflow scenario.
From an operational perspective, this vulnerability presents a significant risk to users who regularly work with 3D content and may encounter malicious .blend files in collaborative environments or third-party content repositories. The attack vector requires social engineering to convince victims to open the malicious file or incorporate it as a library component in their projects, making it particularly dangerous in professional 3D production environments where file sharing and collaboration are common practices. The privilege escalation aspect of this vulnerability means that successful exploitation would allow attackers to execute arbitrary code with the same permissions as the Blender application, potentially leading to complete system compromise.
The security implications extend beyond simple code execution as this vulnerability can be leveraged in broader attack chains. According to ATT&CK framework, this represents a privilege escalation technique through application-specific vulnerabilities, while CWE classification identifies it as a specific instance of integer overflow leading to buffer overflow conditions. The vulnerability's impact is particularly severe in professional 3D creation workflows where users may not expect to encounter malicious code execution risks when opening legitimate 3D files, making it an attractive target for targeted attacks against creative professionals and animation studios.
Mitigation strategies should focus on immediate software updates to patched versions of Blender, along with implementing strict file validation policies for third-party content. Users should avoid opening untrusted .blend files and consider implementing sandboxing mechanisms when processing 3D content. Security-conscious organizations should establish content review procedures for collaborative projects and consider network-level restrictions on file transfers. The vulnerability also underscores the importance of input validation and proper integer overflow protection in mathematical and geometric processing libraries, making it a valuable case study for developers working with computational geometry algorithms and buffer management in creative software applications.