CVE-2007-1253 in Blender
Summary
by MITRE
Eval injection vulnerability in the (a) kmz_ImportWithMesh.py Script for Blender 0.1.9h, as used in (b) Blender before 2.43, allows user-assisted remote attackers to execute arbitrary Python code by importing a crafted (1) KML or (2) KMZ file.
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Analysis
by VulDB Data Team • 09/16/2017
The CVE-2007-1253 vulnerability represents a critical eval injection flaw in Blender's kmz_ImportWithMesh.py script, which was present in Blender versions prior to 2.43. This vulnerability arises from the insecure handling of user-supplied data during the import process of KML and KMZ files, creating a dangerous attack vector that allows remote code execution. The flaw specifically manifests when Blender processes malformed KML or KMZ files that contain crafted Python code within their content, enabling attackers to execute arbitrary commands on systems where the vulnerable software is installed.
The technical implementation of this vulnerability stems from the script's improper sanitization of imported file data, particularly when parsing KML/KMZ formats that may contain embedded Python expressions. When Blender processes these files through the kmz_ImportWithMesh.py script, it employs the eval() function or similar dynamic code execution mechanisms without adequate input validation or sanitization. This behavior directly aligns with CWE-94, which describes the weakness of executing arbitrary code through insecure use of dynamic code execution functions. The vulnerability operates at the intersection of code injection and privilege escalation, as attackers can leverage this flaw to execute malicious Python code with the privileges of the Blender process, potentially leading to full system compromise.
The operational impact of this vulnerability extends beyond simple code execution, as it creates a persistent threat vector for attackers seeking to compromise systems running vulnerable versions of Blender. Since KML and KMZ files are commonly used for geographic data visualization and can be easily distributed through web services, email attachments, or collaborative platforms, this vulnerability provides attackers with numerous opportunities for exploitation. The user-assisted nature of the attack means that victims must actively import the malicious files, but the widespread use of Blender for 3D modeling and animation makes this attack surface particularly concerning. Attackers can craft KML/KMZ files containing malicious Python code that executes when the file is imported, potentially leading to data exfiltration, system reconnaissance, or further exploitation of the compromised system.
Mitigation strategies for this vulnerability require immediate patching of affected Blender installations to version 2.43 or later, where the problematic import scripts have been properly secured. Organizations should implement strict file validation procedures for any KML/KMZ files processed through Blender, including content scanning and sandboxed execution environments. The remediation approach should also include network-level controls such as web application firewalls and content filtering to prevent the delivery of malicious KML/KMZ files to user systems. From an ATT&CK framework perspective, this vulnerability maps to T1059.006 (Python) and T1203 (Exploitation for Client Execution), highlighting the need for both endpoint protection and network-based defenses. Additionally, system administrators should consider implementing least privilege principles for Blender installations and regularly audit file import processes to detect potential malicious activity. The vulnerability underscores the importance of secure coding practices and input validation, particularly when dealing with dynamic code execution in applications that process user-supplied data through file import mechanisms.