CVE-2017-7079 in iTunes
Summary
by MITRE
An issue was discovered in certain Apple products. iTunes before 12.7 is affected. The issue involves the "Data Sync" component. It allows attackers to access iOS backups (written by iTunes) via a crafted app.
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Analysis
by VulDB Data Team • 01/20/2021
The vulnerability identified as CVE-2017-7079 represents a critical security flaw within Apple's iTunes software ecosystem that persisted through versions prior to 12.7. This weakness specifically targets the Data Sync component of iTunes, which serves as the primary interface for managing data synchronization between iOS devices and desktop computers. The vulnerability arises from insufficient validation mechanisms within the backup handling process, creating an exploitable condition that allows malicious actors to gain unauthorized access to iOS device backups that would normally be protected by standard security protocols.
The technical implementation of this vulnerability stems from improper input validation within the Data Sync functionality that processes backup files generated by iTunes. When a user connects an iOS device to a computer running an affected version of iTunes, the software creates backup files that contain sensitive user data including photos, messages, contacts, app data, and device settings. Attackers can craft malicious applications that exploit the lack of proper authentication checks in the backup handling process, enabling them to bypass normal access controls and directly access these backup files without proper authorization. This flaw operates at the application layer and leverages the trust relationship between iTunes and iOS devices to execute unauthorized data access operations.
The operational impact of CVE-2017-7079 extends beyond simple data theft, as iOS backups contain highly sensitive personal information that could be used for identity theft, social engineering attacks, and other malicious activities. The vulnerability affects users who have iTunes installed on their computers and regularly sync their iOS devices, creating a widespread exposure across Apple's user base. Security researchers have classified this issue under CWE-20, which addresses "Improper Input Validation," highlighting the fundamental weakness in the software's ability to properly validate and sanitize input data before processing. The attack vector typically involves installing a malicious application on a victim's computer that triggers the vulnerable code path during normal iTunes operations.
This vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to credential access and defense evasion. The flaw enables adversaries to perform unauthorized data extraction without detection, as the malicious backup access occurs within normal iTunes usage patterns. Organizations and individuals using affected iTunes versions face significant risk of data compromise, especially in environments where multiple users have access to the same computer or where devices are synced in shared workspaces. The vulnerability's persistence across multiple iOS device generations means that affected users may have backups stored on computers for extended periods, potentially exposing years of accumulated personal data. Apple addressed this issue in iTunes version 12.7 through enhanced validation mechanisms and improved access controls for backup files. The resolution demonstrates the importance of maintaining current software versions and implementing proper access controls for sensitive data repositories.
The broader implications of this vulnerability highlight the critical need for robust input validation in desktop synchronization software that handles sensitive mobile device data. Security professionals should implement monitoring for suspicious iTunes activity and ensure that users regularly update their software to prevent exploitation of known vulnerabilities. The incident underscores the importance of secure coding practices in applications that process mobile device backups and emphasizes the necessity of proper access control mechanisms in data synchronization systems. Organizations should consider implementing additional security measures such as encrypted backup storage and regular security assessments of synchronization software to protect against similar vulnerabilities in the future.