CVE-2015-6988 in Mac OS X
Summary
by MITRE
The kernel in Apple iOS before 9.1 and OS X before 10.11.1 does not initialize an unspecified data structure, which allows remote attackers to execute arbitrary code via vectors involving an unknown network-connectivity requirement.
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Analysis
by VulDB Data Team • 11/20/2024
The vulnerability identified as CVE-2015-6988 represents a critical kernel-level flaw affecting Apple iOS versions prior to 9.1 and OS X versions prior to 10.11.1. This issue stems from improper initialization of a data structure within the kernel space, creating a potential pathway for remote code execution attacks. The vulnerability's classification aligns with CWE-665, which addresses improper initialization of data structures, a common vector for privilege escalation and arbitrary code execution in operating system kernels.
The technical nature of this vulnerability lies in the kernel's failure to properly initialize unspecified data structures during system operation. When kernel components fail to initialize critical data structures, they may contain residual data from previous operations or remain in an unpredictable state. This uninitialized memory can be manipulated by attackers to inject malicious code or exploit existing memory layout patterns. The vulnerability requires network connectivity for exploitation, indicating it likely involves network protocols or services that interface with kernel components. This requirement aligns with ATT&CK technique T1068, which covers exploiting legitimate credentials and system access to execute code.
The operational impact of CVE-2015-6988 extends beyond simple code execution, as it represents a fundamental failure in kernel security architecture. Attackers exploiting this vulnerability could potentially gain elevated privileges, bypass security controls, and execute arbitrary commands with kernel-level access. The affected systems include a wide range of Apple devices running vulnerable versions of iOS and OS X, making this vulnerability particularly concerning for enterprise environments and individuals using legacy Apple operating systems. The vulnerability's presence in kernel space means that successful exploitation could result in complete system compromise, data theft, and persistent backdoor access.
Mitigation strategies for this vulnerability primarily involve immediate system updates to the patched versions of iOS 9.1 and OS X 10.11.1, which address the uninitialized data structure issue through proper kernel initialization routines. Organizations should also implement network segmentation and monitoring to detect potential exploitation attempts, as the vulnerability requires network connectivity for remote exploitation. Additional defensive measures include maintaining up-to-date security patches, implementing network intrusion detection systems, and conducting regular security assessments of Apple operating systems in use. The vulnerability demonstrates the critical importance of proper kernel initialization practices and highlights the need for comprehensive security testing of core operating system components.