CVE-2014-4352 in iOS
Summary
by MITRE
Address Book in Apple iOS before 8 relies on the hardware UID for its encryption key, which makes it easier for physically proximate attackers to obtain sensitive information by obtaining this UID.
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Analysis
by VulDB Data Team • 02/16/2022
The vulnerability described in CVE-2014-4352 represents a critical weakness in Apple iOS security architecture that specifically affects the Address Book application across versions prior to iOS 8. This flaw stems from the implementation of encryption mechanisms that depend entirely on the device's unique hardware identifier known as the UID for generating encryption keys. The fundamental issue lies in the predictable nature of hardware UIDs which are designed for device identification rather than cryptographic security. When the operating system uses this hardware-based identifier as the primary component for encryption key derivation, it creates a scenario where an attacker with physical access to the device can potentially extract the UID and subsequently derive the encryption keys used to protect sensitive contact information stored in the Address Book.
The technical exploitation of this vulnerability occurs through physical proximity attacks where adversaries can obtain the hardware UID through various means including direct device access, forensic analysis, or specialized hardware tools. The UID is typically stored in a predictable location within the device's memory or firmware, making it accessible to attackers who can then use this information to reverse-engineer the encryption algorithms employed by the Address Book application. This creates a direct pathway for unauthorized access to personal contact data, including names, phone numbers, email addresses, and other sensitive information that users expect to be protected by the device's encryption mechanisms. The vulnerability essentially undermines the core principle of cryptographic security by relying on a static identifier that is not designed to withstand cryptographic attacks.
From an operational impact perspective, this vulnerability significantly increases the attack surface for physical access threats and creates a substantial risk for users whose devices are lost, stolen, or accessed by unauthorized individuals. The risk is particularly elevated in environments where device security is not properly enforced, such as corporate settings where employees may leave devices unattended or where social engineering attacks could lead to physical device access. The vulnerability affects not only individual users but also enterprise environments where sensitive business contact information could be compromised, potentially leading to identity theft, social engineering attacks, or corporate espionage. Security professionals must consider this vulnerability when assessing the overall security posture of iOS devices, particularly in high-risk environments where physical security controls may be insufficient.
The mitigation strategies for this vulnerability require both immediate and long-term approaches to address the root cause of the encryption implementation flaw. Apple addressed this issue in iOS 8 by implementing more robust encryption key derivation mechanisms that do not rely solely on hardware UIDs, instead incorporating additional entropy sources and more sophisticated key generation processes. Organizations should ensure their iOS devices are updated to versions that contain the necessary security patches and should implement additional security controls such as strong device passcodes, automatic lock features, and remote wipe capabilities. From a compliance standpoint, this vulnerability aligns with CWE-326 which addresses the use of weak encryption, and it represents a technique that could be categorized under ATT&CK tactic of privilege escalation through physical access. Security teams should also consider implementing device management policies that enforce stronger encryption requirements and monitor for potential exploitation attempts that could leverage this type of vulnerability. The incident highlights the importance of proper cryptographic implementation practices and demonstrates how seemingly minor design decisions in security architecture can have significant implications for user data protection.