CVE-2016-1742 in iTunes
Summary
by MITRE
Untrusted search path vulnerability in the installer in Apple iTunes before 12.4 allows local users to gain privileges via a Trojan horse DLL in the current working directory.
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Analysis
by VulDB Data Team • 10/13/2024
The vulnerability identified as CVE-2016-1742 represents a classic untrusted search path issue within Apple iTunes installer component, specifically affecting versions prior to 12.4. This flaw resides in the installer's handling of dynamic link library loading mechanisms, where the application fails to properly validate or sanitize the search path used to locate required libraries during installation processes. The vulnerability stems from the installer's tendency to load DLLs from the current working directory without sufficient verification of their authenticity or origin, creating a pathway for malicious actors to exploit this behavior for privilege escalation.
This security weakness directly maps to CWE-427, which describes uncontrolled search path dependencies, and aligns with ATT&CK technique T1068, which involves local privilege escalation through exploitation of software vulnerabilities. The vulnerability operates under the principle that when an application searches for libraries in predictable locations without proper validation, an attacker can place malicious code in those locations to be executed with elevated privileges. In the context of iTunes, this means that a local attacker could place a specially crafted Trojan horse DLL in the same directory as the installer executable, and when the installer runs, it would load and execute this malicious code with the privileges of the user running the installer.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass broader system compromise potential. When local users can execute arbitrary code with elevated privileges through the iTunes installer, they gain access to system resources that would normally be restricted. This could enable attackers to modify system files, install backdoors, or establish persistence mechanisms within the target environment. The vulnerability is particularly concerning because iTunes was widely distributed and often run with elevated privileges during installation processes, making the attack surface significant. The attack vector requires physical access to the target system or the ability to influence the current working directory of the installer, which could be achieved through various social engineering techniques or by compromising the user's environment.
Mitigation strategies for CVE-2016-1742 should focus on both immediate remediation and long-term architectural improvements. The primary solution involves updating to iTunes version 12.4 or later, where Apple implemented proper DLL loading mechanisms that prevent loading libraries from untrusted paths. Organizations should also implement strict access controls and privilege separation to minimize the impact of such vulnerabilities. System administrators should consider implementing application whitelisting policies that restrict which executables can run with elevated privileges, and deploy monitoring solutions that detect unusual file system activities around installation directories. Additionally, regular security assessments should verify that applications properly handle library loading and do not exhibit similar untrusted search path behaviors. The vulnerability underscores the importance of secure coding practices, particularly in installer components, and demonstrates how seemingly minor implementation flaws can result in significant security risks when combined with user privilege escalation opportunities.