CVE-2020-9905 in tvOS
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. A remote attacker may be able to cause a denial of service.
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Analysis
by VulDB Data Team • 10/03/2022
This vulnerability represents a classic buffer overflow condition that was remediated through enhanced bounds checking mechanisms within Apple's operating systems. The flaw existed in the system's memory management controls, where insufficient validation of input boundaries allowed malicious data to overwrite adjacent memory regions. Such buffer overflows typically occur when programs fail to properly verify that data being written to memory buffers does not exceed the allocated buffer size, creating opportunities for memory corruption and system instability.
The technical implementation of this vulnerability demonstrates a failure in input validation controls that aligns with CWE-121, which describes stack-based buffer overflow conditions. Attackers could potentially exploit this weakness to execute remote code or cause system crashes through carefully crafted inputs that exceed buffer limits. The vulnerability's classification as a remote attack vector indicates that no local user interaction is required for exploitation, making it particularly dangerous as it could be leveraged by attackers over network connections without user involvement.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as buffer overflows can provide attackers with opportunities to execute arbitrary code or escalate privileges within the affected systems. When a remote attacker successfully exploits this condition, they could potentially gain unauthorized access to system resources, compromise user data, or disrupt normal system operations. The specific nature of the fix in iOS 13.6, iPadOS 13.6, macOS Catalina 10.15.6, and tvOS 13.4.8 indicates that Apple implemented enhanced memory boundary checking mechanisms that prevent the overflow conditions from occurring.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter usage, as attackers could potentially leverage buffer overflows to execute malicious commands within compromised systems. The remediation approach taken by Apple demonstrates the importance of proper bounds checking implementations in preventing memory corruption vulnerabilities. Organizations should prioritize patching this vulnerability across all affected platforms to prevent potential exploitation and maintain system integrity. The fix represents a defensive programming approach that emphasizes input validation and memory safety controls, which are fundamental requirements for secure system development practices.