CVE-2016-7648 in iCloud
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.2 is affected. Safari before 10.0.2 is affected. iCloud before 6.1 is affected. iTunes before 12.5.4 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
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Analysis
by VulDB Data Team • 10/07/2022
The vulnerability identified as CVE-2016-7648 represents a critical memory corruption flaw within Apple's WebKit rendering engine that affected multiple Apple products including iOS versions prior to 10.2, Safari versions before 10.0.2, iCloud versions before 6.1, and iTunes versions before 12.5.4. This vulnerability resides within the WebKit component which serves as the core browser engine responsible for rendering web content across Apple's ecosystem. The flaw stems from improper memory management during web page processing, creating opportunities for attackers to manipulate memory structures through maliciously crafted web content.
The technical nature of this vulnerability falls under CWE-119, which describes "Improper Access to Memory Location" and specifically relates to memory corruption issues that occur when applications fail to properly validate memory access boundaries. Attackers could exploit this weakness by hosting specially crafted web pages that trigger memory corruption during WebKit's processing of web content. The exploitation mechanism typically involves manipulating JavaScript or HTML elements that cause the browser engine to improperly handle memory allocation and deallocation, leading to unpredictable behavior. The vulnerability manifests as either arbitrary code execution or denial of service conditions that can crash applications and potentially allow remote code execution.
The operational impact of CVE-2016-7648 extends beyond simple application crashes, as it represents a significant threat to user security and system integrity. When exploited, this vulnerability enables attackers to gain unauthorized code execution capabilities on affected systems, potentially allowing them to install malware, access sensitive user data, or escalate privileges. The attack surface is particularly broad given that the vulnerability affects multiple Apple products that users regularly interact with including web browsers, email clients, and file synchronization applications. The memory corruption aspect means that even if an attacker cannot directly execute code, they can still cause applications to crash repeatedly, effectively creating persistent denial of service conditions that disrupt user productivity and system availability.
Mitigation strategies for this vulnerability primarily involve updating to the patched versions of affected Apple products, with iOS 10.2, Safari 10.0.2, iCloud 6.1, and iTunes 12.5.4 representing the minimum required versions to address the issue. System administrators should prioritize deployment of these updates across all affected devices within their networks, particularly in enterprise environments where multiple users may be exposed to malicious web content. Additional protective measures include implementing web filtering solutions, enabling sandboxing features where available, and educating users about the risks of visiting untrusted websites. Security professionals should monitor for exploitation attempts through network traffic analysis and browser-based security controls, as the vulnerability can be leveraged through various attack vectors including phishing campaigns, malicious advertisements, and compromised websites that serve as delivery mechanisms for exploit code.
The vulnerability demonstrates the importance of maintaining current security patches in enterprise environments and highlights the risks associated with delayed patch deployment. Organizations should implement robust patch management processes that can quickly identify and deploy security updates for critical vulnerabilities like CVE-2016-7648, which aligns with ATT&CK framework techniques for maintaining access and privilege escalation through software exploitation. This particular vulnerability also underscores the need for continuous security monitoring and incident response capabilities, as the memory corruption nature of the flaw can be difficult to detect through conventional security scanning methods and may require specialized forensic analysis to identify successful exploitation attempts.