CVE-2015-7043 in iOS
Summary
by MITRE
The kernel in Apple iOS before 9.2, OS X before 10.11.2, tvOS before 9.1, and watchOS before 2.1 allows attackers to cause a denial of service via a crafted app, a different vulnerability than CVE-2015-7040, CVE-2015-7041, and CVE-2015-7042.
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Analysis
by VulDB Data Team • 11/12/2024
The vulnerability identified as CVE-2015-7043 represents a critical kernel-level flaw affecting multiple Apple operating systems including iOS versions prior to 9.2, OS X versions before 10.11.2, tvOS versions before 9.1, and watchOS versions before 2.1. This issue falls under the broader category of kernel panic vulnerabilities that can be exploited to cause system-wide denial of service conditions. The vulnerability is distinct from other related issues such as CVE-2015-7040, CVE-2015-7041, and CVE-2015-7042, indicating that it represents a unique code path or memory handling mechanism within the kernel that can be manipulated by malicious applications. The technical nature of this vulnerability suggests it operates at the most privileged level of the operating system where kernel memory management and process scheduling functions reside, making it particularly dangerous as it can potentially compromise the entire system stability.
The underlying technical flaw in CVE-2015-7043 appears to be related to improper handling of crafted input or memory structures within kernel space operations. This type of vulnerability typically involves buffer overflows, use-after-free conditions, or improper validation of input parameters that are processed by kernel-level functions. When exploited, the vulnerability allows attackers to craft malicious applications that can trigger specific kernel functions in ways that lead to system crashes or complete system hangs. The vulnerability's impact is amplified because it operates within the kernel space where the operating system's core functionalities reside, meaning that any exploitation can result in immediate system termination rather than just application-level failures. This characteristic aligns with common patterns found in CWE-119 (Improper Access to Memory) and CWE-121 (Stack-based Buffer Overflow) categories that are frequently targeted in kernel-level exploits.
The operational impact of CVE-2015-7043 extends beyond simple system crashes to potentially enable more sophisticated attack vectors that could be leveraged by threat actors. Attackers can utilize this vulnerability to create persistent denial of service conditions that prevent legitimate users from accessing their devices or systems. The vulnerability's ability to affect multiple Apple platforms simultaneously suggests that it may be related to shared kernel components or common system call interfaces that are utilized across different operating systems in the Apple ecosystem. This cross-platform nature increases the attack surface and makes the vulnerability particularly concerning for organizations that deploy Apple devices in enterprise environments. The vulnerability's exploitation requires a crafted application that can be delivered through various means including malicious app stores, compromised websites, or social engineering campaigns that trick users into installing malicious software. This attack vector aligns with ATT&CK technique T1059 (Command and Scripting Interpreter) and T1070 (Indicator Removal on Host) as attackers can leverage such vulnerabilities to maintain persistence or cover their tracks.
Mitigation strategies for CVE-2015-7043 should prioritize immediate system updates to the patched versions of affected operating systems, as Apple released security updates specifically addressing this vulnerability. Organizations should implement comprehensive patch management policies that ensure all Apple devices within their network are updated promptly to prevent exploitation. Additionally, network monitoring solutions should be configured to detect anomalous behavior patterns that might indicate exploitation attempts, particularly focusing on unusual kernel-level activity or system crash patterns. The vulnerability's nature suggests that behavioral monitoring of system calls and kernel operations could provide early warning signs of potential exploitation attempts. Security teams should also consider implementing application whitelisting policies that restrict the installation of unauthorized applications, as the vulnerability requires a malicious app to be present on the device for exploitation to occur. Regular security assessments and penetration testing should be conducted to identify potential exploitation vectors and verify that systems have been properly patched against this vulnerability. The remediation process should include thorough validation of system integrity through kernel integrity checks and verification that all patches have been successfully applied across all affected platforms.