CVE-2018-4373 in Safari
Summary
by MITRE
Multiple memory corruption issues were addressed with improved memory handling. This issue affected versions prior to iOS 12.1, watchOS 5.1, Safari 12.0.1, iTunes 12.9.1, iCloud for Windows 7.8.
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Analysis
by VulDB Data Team • 04/08/2020
The vulnerability identified as CVE-2018-4373 represents a critical memory corruption issue that affected multiple Apple operating systems and applications. This flaw manifested in improper memory handling practices that could lead to unpredictable system behavior and potential exploitation by malicious actors. The vulnerability was particularly concerning as it impacted widely used platforms including iOS, watchOS, Safari web browser, iTunes desktop application, and iCloud synchronization software for Windows users. The affected versions prior to iOS 12.1, watchOS 5.1, Safari 12.0.1, iTunes 12.9.1, and iCloud for Windows 7.8 created a substantial attack surface across Apple's ecosystem.
The technical root cause of this vulnerability lies in inadequate memory management within Apple's software implementations. Memory corruption issues typically arise when applications fail to properly allocate, initialize, or free memory resources, leading to buffer overflows, use-after-free conditions, or other heap-based vulnerabilities. In this case, the flaw likely involved improper bounds checking during memory operations, allowing attackers to manipulate memory contents through crafted inputs or specific user interactions. Such vulnerabilities fall under the CWE-122 category of "Heap-based Buffer Overflow" and may also relate to CWE-416 "Use After Free" or CWE-787 "Out-of-bounds Write" depending on the specific implementation details. The memory corruption could potentially be exploited to execute arbitrary code, escalate privileges, or cause denial of service conditions that compromise system integrity.
The operational impact of CVE-2018-4373 extends across multiple attack vectors and user scenarios. Mobile device users running affected iOS versions faced risks during normal application usage, web browsing, or when interacting with malicious content through Safari. The vulnerability's presence in iTunes and iCloud for Windows meant that desktop users were also at risk, particularly when synchronizing data or accessing cloud services. The exploitation of this flaw could enable attackers to gain unauthorized access to user data, execute malicious code on target systems, or establish persistent backdoors. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1059.007 for "Command and Scripting Interpreter: JavaScript" and potentially T1068 for "Exploitation for Privilege Escalation" when combined with other attack chains. The widespread nature of the affected software meant that successful exploitation could potentially impact millions of users across different platforms.
Apple's response to this vulnerability involved releasing security updates that improved memory handling mechanisms throughout their affected software ecosystem. These patches typically addressed the underlying memory management flaws by implementing proper bounds checking, adding memory protection mechanisms, and ensuring proper deallocation of resources. Organizations and individuals should prioritize updating their systems to versions that contain these fixes, particularly since the vulnerability affected core system components that are essential for daily operations. The remediation process requires careful attention to ensure that all affected platforms receive proper updates, including mobile devices, desktop applications, and cloud synchronization services. Security teams should monitor for any indicators of exploitation attempts and consider implementing additional protective measures such as network monitoring and application whitelisting to mitigate potential risks from unpatched systems.