CVE-2020-9869 in macOS
Summary
by MITRE • 10/23/2020
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Catalina 10.15.6. A remote attacker may cause an unexpected application termination.
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Analysis
by VulDB Data Team • 10/03/2022
The vulnerability identified as CVE-2020-9869 represents a memory corruption flaw that affects macOS Catalina 10.15.5 and earlier versions. This issue stems from inadequate memory handling mechanisms within the operating system's kernel or system frameworks, creating a condition where improper memory management can lead to system instability. The vulnerability manifests when remote attackers exploit specific memory access patterns that trigger buffer overflows or memory corruption conditions. According to the security advisory, the flaw occurs during normal system operations when applications process certain inputs or data structures that exceed allocated memory boundaries, resulting in unpredictable behavior.
The technical implementation of this vulnerability aligns with common memory safety issues classified under CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write operations. The flaw operates at a low system level where memory allocation and deallocation processes fail to properly validate input parameters or maintain proper memory boundaries. When a remote attacker crafts malicious input or network traffic that triggers this condition, the system's memory management subsystem becomes compromised, potentially leading to application crashes or more severe system instability. The memory corruption can occur during network protocol processing, file handling, or other system functions that involve dynamic memory allocation.
From an operational perspective, this vulnerability presents significant risk to macOS environments as it allows remote attackers to cause unexpected application termination without requiring local system access. The impact extends beyond individual applications to potentially affect system stability and availability, as the memory corruption can propagate through system components and affect multiple running processes. The vulnerability's classification under the ATT&CK framework would place it within the T1059.007 technique category, specifically targeting application execution and memory management processes. Organizations using affected macOS versions face potential denial of service scenarios where legitimate applications may crash or become unresponsive, leading to productivity losses and potential data integrity concerns.
The fix implemented in macOS Catalina 10.15.6 addresses the root cause by enhancing memory handling mechanisms and implementing stricter bounds checking procedures. This update introduces improved memory allocation validation, enhanced buffer management routines, and additional safeguards against malformed input processing. Security teams should prioritize deployment of this update across all affected systems, particularly in enterprise environments where macOS devices serve as critical business infrastructure. The remediation process involves standard operating system update procedures, though organizations should verify the update's successful installation through system inventory management tools. Additionally, network monitoring solutions should be configured to detect potential exploitation attempts targeting this vulnerability, as the memory corruption may manifest as unusual application behavior or network traffic patterns.