CVE-2015-5876 in Watch
Summary
by MITRE
dyld in Dev Tools in Apple iOS before 9 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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Analysis
by VulDB Data Team • 11/21/2024
The vulnerability identified as CVE-2015-5876 resides within the dynamic linker dyld component of Apple's iOS operating system, specifically affecting versions prior to iOS 9. This flaw represents a critical security issue that undermines the integrity of the system's application loading mechanism, which is fundamental to iOS security architecture. The dynamic linker serves as the core component responsible for loading and linking shared libraries during application execution, making it a prime target for attackers seeking to escalate privileges or compromise system stability.
The technical nature of this vulnerability stems from improper handling of crafted application payloads within the dyld framework. Attackers can exploit memory corruption issues that occur when the dynamic linker processes maliciously constructed applications, leading to potential arbitrary code execution in a privileged context. This memory corruption vulnerability allows adversaries to manipulate the execution flow of the dynamic linker itself, potentially enabling them to execute code with elevated privileges that would normally be restricted to system-level processes. The flaw operates at the kernel level, making it particularly dangerous as it can bypass standard user-space security controls and protections.
From an operational impact perspective, this vulnerability creates significant risks for iOS devices running affected versions, as it allows attackers to gain unauthorized access to system resources and potentially compromise the entire device. The ability to execute arbitrary code in a privileged context means that malicious actors could install persistent backdoors, access sensitive user data, modify system files, or even disable security features entirely. The denial of service component of this vulnerability further compounds the risk, as attackers could destabilize devices through memory corruption, potentially causing system crashes or rendering devices unusable. This makes the vulnerability particularly attractive to threat actors seeking both persistent access and system disruption.
The security implications extend beyond immediate device compromise, as this vulnerability aligns with several ATT&CK tactics including privilege escalation and execution through legitimate system tools. The flaw demonstrates how weaknesses in core system components can undermine the entire security model of an operating system. Organizations and individuals using iOS devices before version 9 should prioritize immediate remediation through system updates, as the vulnerability represents a significant risk to device integrity and user privacy. The remediation process involves updating to iOS 9 or later versions where Apple has implemented proper memory validation and bounds checking mechanisms within the dyld framework. This vulnerability also underscores the importance of proper input validation and memory management practices in system-level components, as referenced in CWE categories related to memory corruption and privilege escalation vulnerabilities.
Mitigation strategies should include immediate deployment of iOS 9 updates across all affected devices, along with enhanced monitoring for suspicious application installations. Security teams should implement application whitelisting policies where possible and conduct regular vulnerability assessments to identify other potential attack vectors. The remediation process should also include comprehensive security awareness training for users to recognize potentially malicious applications that might exploit similar vulnerabilities in other system components. Organizations should consider implementing additional layers of security monitoring to detect unauthorized code execution attempts and ensure proper patch management protocols are in place to prevent similar vulnerabilities from being exploited in the future.