CVE-2020-9880 in watchOS
Summary
by MITRE • 10/23/2020
A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 13.6 and iPadOS 13.6, macOS Catalina 10.15.6, tvOS 13.4.8, watchOS 6.2.8. Processing a maliciously crafted USD file may lead to unexpected application termination or arbitrary code execution.
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Analysis
by VulDB Data Team • 10/03/2022
The vulnerability identified as CVE-2020-9880 represents a critical buffer overflow flaw in Apple's multimedia processing frameworks that affects multiple operating systems including iOS, iPadOS, macOS, tvOS, and watchOS. This issue stems from inadequate bounds checking during the processing of Universal Scene Description USD files, which are commonly used in 3D graphics applications and content creation tools. The flaw exists within Apple's proprietary rendering pipelines that handle complex 3D scene data structures, making it particularly dangerous as it can be triggered through legitimate file processing operations that users might encounter in daily computing activities.
The technical nature of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory boundaries. When a maliciously crafted USD file is processed by affected applications, the buffer overflow can occur during parsing operations where the application fails to properly validate the size and structure of incoming data. This particular implementation flaw manifests in the way Apple's CoreGraphics and SceneKit frameworks handle memory allocation for 3D scene data, specifically when dealing with nested object structures and array elements within USD files. The vulnerability creates a condition where attacker-controlled data can overwrite adjacent memory locations, potentially leading to arbitrary code execution or application crashes.
The operational impact of CVE-2020-9880 extends beyond simple application instability, as it provides a potential pathway for remote code execution attacks that could be leveraged by threat actors. Attackers could craft specially designed USD files that, when opened by vulnerable applications, would trigger the buffer overflow condition and allow for privilege escalation or full system compromise. This vulnerability affects not only end-user applications but also enterprise content management systems that rely on USD file formats for 3D asset sharing and collaboration. The attack surface is particularly concerning given that USD files are commonly used in professional environments, making this a high-risk vulnerability for organizations that handle 3D content or use Apple's ecosystem for creative workflows.
Security professionals should note that this vulnerability maps to several ATT&CK techniques including T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation. The remediation strategy involves immediate deployment of the security updates released by Apple, which include enhanced bounds checking mechanisms and memory protection improvements. Organizations should implement additional defensive measures such as network segmentation, application whitelisting, and file validation policies to prevent the execution of untrusted USD files. The fix addresses the root cause through improved memory management practices and validation routines that prevent the overflow condition from occurring during USD file processing. Regular security monitoring and vulnerability assessment programs should include checks for this specific vulnerability to ensure comprehensive protection across all affected platforms.