CVE-2017-6982 in iOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. The issue involves the "Notifications" component. It allows attackers to cause a denial of service via a crafted app.
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Analysis
by VulDB Data Team • 09/27/2024
The vulnerability identified as CVE-2017-6982 represents a critical security flaw within Apple's iOS notification system affecting versions prior to 10.3.2. This weakness resides in the Notifications component of the operating system and demonstrates how seemingly benign functionality can be exploited to create significant operational disruptions. The issue specifically targets the way iOS handles notification data processing, creating a potential avenue for malicious actors to exploit system resources through carefully constructed applications.
The technical implementation of this vulnerability stems from inadequate input validation within the notification handling mechanism. When a malicious application attempts to send specially crafted notifications to the system, the iOS notification framework fails to properly sanitize or restrict the notification data structure. This lack of proper validation creates a condition where malformed notification payloads can trigger unexpected behavior within the operating system's notification processing subsystem. The flaw operates at the kernel level where notification handling occurs, making it particularly dangerous as it can affect core system functionality without requiring user interaction or elevated privileges.
From an operational perspective, this vulnerability enables attackers to execute denial of service attacks against iOS devices by simply installing a malicious application that sends crafted notification payloads. The impact extends beyond simple service disruption as the vulnerability can potentially cause system instability, application crashes, and in severe cases, device freezes or reboots. The attack vector is particularly concerning because it requires minimal user interaction, as the malicious app can be installed through normal app distribution channels without requiring special permissions or root access. This characteristic places the vulnerability within the ATT&CK framework category of privilege escalation and persistence mechanisms, as it can be used to maintain system instability and prevent normal operation.
The security implications of CVE-2017-6982 align with CWE-129, which addresses improper validation of input, specifically in the context of notification handling and processing. The vulnerability demonstrates how insufficient bounds checking and input sanitization can create exploitable conditions within system components that are designed to be secure and reliable. Organizations and users affected by this vulnerability face significant risk as the denial of service condition can be triggered remotely through app installation, potentially affecting large numbers of devices simultaneously. The flaw's existence in the notification framework also raises concerns about the broader security model of iOS, as notification handling represents a critical interface between applications and system resources that requires robust validation mechanisms.
Mitigation strategies for this vulnerability primarily focus on immediate system updates to iOS 10.3.2 or later versions where Apple has implemented proper input validation and sanitization measures for notification processing. System administrators should prioritize deployment of these security patches across all affected devices and implement application whitelisting policies to prevent installation of untrusted applications that could potentially exploit this vulnerability. The remediation approach should also include monitoring for unusual notification patterns that might indicate exploitation attempts, as well as implementing network-level controls to restrict app installation from untrusted sources. Additionally, users should maintain awareness of the potential for malicious apps to exploit such vulnerabilities and should only install applications from verified sources. The vulnerability serves as a reminder of the importance of comprehensive input validation and the critical need for regular security updates in mobile operating systems.