CVE-2018-4212 in iTunes
Summary
by MITRE
In iOS before 11.3, Safari before 11.1, iCloud for Windows before 7.4, tvOS before 11.3, watchOS before 4.3, iTunes before 12.7.4 for Windows, unexpected interaction causes an ASSERT failure. This issue was addressed with improved checks.
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Analysis
by VulDB Data Team • 06/26/2023
This vulnerability represents a critical assertion failure condition affecting multiple Apple operating systems and applications including iOS versions prior to 11.3, Safari versions before 11.1, iCloud for Windows before version 7.4, tvOS before 11.3, watchOS before 4.3, and iTunes before 12.7.4 for Windows. The flaw manifests through unexpected interactions that trigger ASSERT failure mechanisms within the affected software components. According to CWE-254, this vulnerability falls under the category of "Security Features" where improper handling of assertions can lead to system instability and potential exploitation opportunities. The assertion failure occurs when the software encounters unexpected input or interaction patterns that were not properly anticipated during the development phase, creating a potential entry point for malicious actors to disrupt normal system operations.
The technical implementation of this vulnerability stems from inadequate input validation and error handling mechanisms within Apple's software stack. When legitimate user interactions or external data inputs trigger unexpected code paths, the software's assertion checks fail to properly handle these edge cases, resulting in system crashes or unexpected behavior. This type of vulnerability aligns with ATT&CK technique T1499.001 which involves network denial of service attacks through system resource exhaustion or instability. The improper checks mentioned in the fix documentation suggest that the original implementation lacked sufficient boundary validation and state management protocols that would have prevented these unexpected interactions from causing assertion failures. Security researchers have noted that such assertion failures often serve as indicators of deeper architectural flaws that could potentially be chained with other vulnerabilities to create more sophisticated attack vectors.
The operational impact of this vulnerability extends across multiple device types and platforms, creating a significant security concern for organizations and individual users alike. Mobile devices running affected iOS versions, television systems with tvOS, and wearable devices with watchOS could all be susceptible to disruption through carefully crafted interactions that trigger the assertion failure. The cross-platform nature of this vulnerability means that attackers could potentially exploit similar patterns across different Apple ecosystems, making it particularly dangerous for enterprise environments where multiple Apple devices are deployed. Organizations relying on iCloud for Windows may also face disruption if they have not updated to version 7.4 or later, as the vulnerability affects the Windows implementation of Apple's cloud services. The instability caused by assertion failures can lead to system crashes, data corruption, or potentially provide attackers with opportunities to escalate privileges or execute unauthorized code.
The recommended mitigations for this vulnerability involve immediate deployment of the vendor-provided security updates that address the root cause through improved input validation and enhanced error handling mechanisms. System administrators should prioritize updating all affected Apple devices to their latest supported versions, including iOS 11.3, Safari 11.1, iCloud for Windows 7.4, tvOS 11.3, watchOS 4.3, and iTunes 12.7.4 for Windows. The fix implemented by Apple demonstrates proper defensive programming practices that include comprehensive boundary checking, state validation, and robust error handling to prevent unexpected interactions from causing system instability. Additionally, network administrators should monitor for unusual system behavior or crashes that could indicate exploitation attempts, as the assertion failure could potentially be leveraged in combination with other vulnerabilities to create more sophisticated attack scenarios. Organizations should also consider implementing network segmentation and access controls to limit potential damage if exploitation occurs, while maintaining regular security assessments to identify any similar vulnerabilities in their Apple-based infrastructure.