CVE-2014-8840 in iOS
Summary
by MITRE
The iTunes Store component in Apple iOS before 8.1.3 allows remote attackers to bypass a Safari sandbox protection mechanism by leveraging redirection of an SSL URL to the iTunes Store.
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Analysis
by VulDB Data Team • 03/07/2022
The vulnerability described in CVE-2014-8840 represents a significant sandbox bypass flaw within Apple iOS that affected versions prior to 8.1.3. This security issue resides in the iTunes Store component and demonstrates how seemingly isolated application modules can create pathways for broader system compromise. The flaw exploits a fundamental weakness in the operating system's security model by allowing malicious actors to circumvent the sandbox protection mechanisms that are designed to isolate different application components and prevent unauthorized access to system resources. The vulnerability specifically targets the interaction between Safari's security model and iTunes Store's URL handling capabilities, creating a dangerous intersection where user trust can be manipulated to achieve unauthorized system access.
The technical exploitation of this vulnerability occurs through a sophisticated redirection attack that leverages SSL URL handling mechanisms. Attackers can craft malicious URLs that initially appear to be legitimate Safari navigation but are actually redirecting to iTunes Store components with elevated privileges. This technique exploits the trust relationships between different iOS components and demonstrates how the system's certificate validation and URL redirection handling can be manipulated to bypass security boundaries. The flaw essentially allows an attacker to transition from a sandboxed web browsing environment into a more privileged iTunes Store context where normal security restrictions do not apply. This type of attack vector falls under the category of cross-component privilege escalation and represents a classic example of how security boundaries can be circumvented through careful manipulation of application flow control.
The operational impact of this vulnerability extends beyond simple information disclosure or unauthorized access to encompass broader system compromise capabilities. When successfully exploited, the vulnerability enables attackers to potentially access sensitive user data, manipulate application behavior, and potentially escalate privileges to gain deeper system access. The sandbox bypass allows malicious code to execute with elevated privileges that would normally be restricted to the iTunes Store component, creating a pathway for more sophisticated attacks. This vulnerability is particularly concerning because it operates at a fundamental level of the operating system's security architecture and affects the core trust model that iOS uses to protect users from malicious content. The attack requires minimal user interaction beyond visiting a malicious website, making it particularly dangerous in phishing or social engineering scenarios.
Mitigation strategies for this vulnerability focus on both immediate patching and broader security hardening measures. The primary solution involves updating to iOS 8.1.3 or later versions where Apple has implemented proper URL handling and redirection controls that prevent the bypass of sandbox protections. Security teams should also implement network-level controls to monitor and block suspicious URL redirection patterns, particularly those involving SSL certificate transitions between trusted and untrusted domains. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how seemingly small flaws in URL handling can create significant security risks. Organizations should also consider implementing additional monitoring for unusual patterns of iTunes Store access or Safari navigation that could indicate exploitation attempts. This vulnerability aligns with CWE-122 which addresses buffer overflow vulnerabilities, and represents a specific instance of improper access control that allows privilege escalation through component interaction flaws. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques and can be used as a stepping stone for more comprehensive system compromise operations.