CVE-2020-6150 in OpenUSD
Summary
by MITRE • 11/13/2020
A heap overflow vulnerability exists in Pixar OpenUSD 20.05 when the software USDC file format SPECS section decompression heap overflow.
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Analysis
by VulDB Data Team • 12/07/2020
The heap overflow vulnerability in Pixar OpenUSD 20.05 represents a critical security flaw within the software's handling of USDC file format specifications. This vulnerability specifically manifests during the decompression process of the SPECS section within USDC files, where insufficient bounds checking allows maliciously crafted input to overwrite adjacent heap memory regions. The flaw stems from inadequate validation of compressed data lengths and buffer boundaries during the decompression routine, creating an exploitable condition that could lead to arbitrary code execution or system instability. The vulnerability affects users who process or open USDC files through Pixar OpenUSD software, particularly in environments where untrusted content may be encountered during normal operations.
The technical implementation of this heap overflow occurs when the decompression algorithm processes compressed data without proper verification of the expected output buffer size. The software's decompression engine fails to validate the relationship between compressed input data and the allocated heap buffer, allowing an attacker to craft a malicious SPECS section that exceeds the allocated memory boundaries. This condition results in memory corruption that can be leveraged to overwrite critical heap metadata or adjacent memory segments, potentially enabling privilege escalation or denial of service scenarios. The vulnerability operates at the application layer and does not require elevated privileges to exploit, making it particularly dangerous in environments where users process third-party content.
From an operational impact perspective, this vulnerability poses significant risks to creative studios, animation houses, and organizations that rely on Pixar OpenUSD for digital content creation and management. The attack surface includes any system that processes USDC files, particularly those that automatically parse or validate content from external sources. The vulnerability could be exploited through social engineering campaigns targeting content creators or through compromised third-party assets that contain maliciously crafted SPECS sections. Organizations utilizing OpenUSD for production workflows face potential data integrity issues, system crashes, and unauthorized access risks that could disrupt creative processes and compromise sensitive digital assets.
Mitigation strategies for this vulnerability should prioritize immediate software updates to patched versions of Pixar OpenUSD where available. System administrators should implement strict file validation procedures and content filtering for USDC files, particularly those received from untrusted sources. The implementation of sandboxing mechanisms during file processing can help contain potential exploitation attempts and limit the impact of successful attacks. Additionally, network segmentation and access controls should be enforced to prevent unauthorized file processing and reduce the attack surface. Organizations should also conduct regular security assessments of their OpenUSD implementations and establish incident response procedures for handling potential exploitation attempts. This vulnerability aligns with CWE-121 heap-based buffer overflow and represents a typical application-level exploit that follows ATT&CK technique T1203 for legitimate program exploitation, emphasizing the need for comprehensive defensive measures against such threats.