CVE-2015-5863 in Watch
Summary
by MITRE
IOStorageFamily in Apple iOS before 9 does not properly initialize an unspecified data structure, which allows local users to obtain sensitive information from kernel memory via unknown vectors.
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Analysis
by VulDB Data Team • 11/21/2024
The vulnerability identified as CVE-2015-5863 resides within the IOStorageFamily component of Apple iOS versions prior to 9.0, representing a critical security flaw that stems from improper initialization of kernel data structures. This issue falls under the category of information disclosure vulnerabilities, where insufficient validation and initialization processes create opportunities for unauthorized access to sensitive kernel memory regions. The vulnerability manifests when the IOStorageFamily driver fails to properly initialize certain data structures, potentially exposing confidential information stored in kernel memory to local attackers who can leverage this weakness through unspecified attack vectors.
The technical nature of this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions where a program reads data located outside the boundaries of a buffer or data structure. In this case, the improper initialization creates a scenario where kernel memory may contain residual data from previous operations or uninitialized memory segments that could be accessed by malicious code. The IOStorageFamily driver handles storage device interactions and kernel memory management, making it a prime target for attackers seeking to extract sensitive information such as cryptographic keys, session tokens, or other confidential data that might be present in the uninitialized memory regions.
From an operational perspective, this vulnerability presents significant risks to iOS devices running versions before 9.0, as local attackers who can execute code on the device may exploit this flaw to gain access to kernel memory contents. The attack vector is particularly concerning because it requires only local execution privileges, meaning that any application or process running on the device could potentially exploit this vulnerability to extract sensitive information from the kernel space. This weakness could enable attackers to obtain credentials, encryption keys, or other confidential data that should remain protected within the kernel's secure memory space, undermining the fundamental security model of iOS.
The impact of this vulnerability extends beyond simple information disclosure, as the extracted kernel memory information could potentially be used to facilitate more sophisticated attacks or to bypass other security mechanisms within the iOS operating system. Attackers might leverage the leaked information to perform privilege escalation, bypass kernel security features, or conduct targeted attacks against specific applications or services running on the device. The vulnerability's classification as a local information disclosure issue means that the attack surface is limited to users who already have some level of access to the device, but this still represents a serious security concern given the sensitive nature of kernel memory contents.
Mitigation strategies for CVE-2015-5863 primarily focus on upgrading to iOS version 9.0 or later, where Apple has implemented proper initialization procedures for the affected data structures within IOStorageFamily. System administrators and device users should prioritize immediate deployment of the security update to prevent exploitation of this vulnerability. Additionally, organizations should implement monitoring solutions to detect potential exploitation attempts and maintain comprehensive incident response procedures to address any security breaches that may occur. The vulnerability's resolution demonstrates Apple's ongoing commitment to addressing kernel-level security flaws, aligning with industry best practices for maintaining secure operating system implementations. Security professionals should also consider implementing additional protective measures such as kernel memory protection mechanisms and access control policies to further reduce the potential impact of similar vulnerabilities in the future.
This vulnerability exemplifies the importance of proper memory initialization in kernel-level code, as highlighted by ATT&CK technique T1068 which covers local privilege escalation through kernel exploits. The issue demonstrates how seemingly minor initialization flaws can create significant security risks when operating in kernel space, where memory access controls are more relaxed and the potential for information leakage is much greater than in user-space applications. The remediation approach for this vulnerability reinforces industry standards for secure coding practices and proper resource management in operating system components.