CVE-2018-4461 in Xcode
Summary
by MITRE
A memory corruption issue was addressed with improved input validation. This issue affected versions prior to iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, watchOS 5.1.2.
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Analysis
by VulDB Data Team • 05/20/2020
The vulnerability identified as CVE-2018-4461 represents a memory corruption flaw that existed in Apple's operating systems prior to specific security updates. This issue was classified as a critical memory safety problem that could potentially allow attackers to execute arbitrary code or cause system instability. The vulnerability affected multiple Apple platforms including iOS, macOS, tvOS, and watchOS, indicating a widespread impact across the company's ecosystem. The memory corruption aspect suggests that the flaw could lead to unpredictable behavior when the affected systems processed certain inputs or operations, potentially creating opportunities for privilege escalation or denial of service conditions.
The technical nature of this vulnerability stems from insufficient input validation mechanisms within Apple's operating system components. When systems processed malformed or unexpected inputs, the lack of proper validation routines could cause memory corruption that might be exploited to manipulate system behavior. This type of flaw typically occurs when software fails to properly sanitize or verify data before processing it, creating opportunities for attackers to craft malicious inputs that trigger buffer overflows, heap corruption, or other memory-related issues. The vulnerability aligns with CWE-129, which describes improper validation of length of input buffers, and CWE-787, which covers out-of-bounds write operations. These weaknesses create pathways for attackers to manipulate memory layouts and potentially execute malicious code with elevated privileges.
The operational impact of CVE-2018-4461 was significant given the widespread deployment of affected operating systems across consumer and enterprise environments. Users running versions prior to the patched releases faced potential exposure to remote code execution attacks, particularly when interacting with malicious content or performing operations that triggered the vulnerable code paths. The vulnerability's presence in multiple platform versions meant that organizations needed to coordinate security updates across their entire Apple ecosystem, including mobile devices, desktop computers, and media players. Attackers could potentially leverage this flaw to compromise user devices, access sensitive data, or establish persistent access to target systems. The issue also highlighted the importance of timely security patch management in preventing exploitation of known vulnerabilities, as the window between vulnerability disclosure and exploitation could be quite short in practice.
Apple addressed this vulnerability through comprehensive input validation improvements across affected platforms, releasing security updates for iOS 12.1.1, macOS Mojave 10.14.2, tvOS 12.1.1, and watchOS 5.1.2. Organizations should have implemented these patches promptly to eliminate the risk of exploitation, as the vulnerability could have been exploited in the wild before patches were available. The remediation efforts followed standard security practices for memory corruption issues, focusing on strengthening input validation routines and implementing additional memory safety checks. Security professionals should have monitored for signs of exploitation attempts and implemented network monitoring to detect potential attacks targeting this vulnerability. The incident underscored the need for continuous security assessments and the importance of maintaining up-to-date security patches across all operating systems and applications within an organization's infrastructure, aligning with ATT&CK technique T1068 which covers exploit for privilege escalation and T1190 which covers exploitation of remote services. Organizations should have also considered implementing additional security controls such as application whitelisting and network segmentation to limit the potential impact of similar vulnerabilities in the future.