CVE-2006-3500 in Mac OS X
Summary
by MITRE
The dynamic linker (dyld) in Apple Mac OS X 10.4.7 allows local users to execute arbitrary code via an "improperly handled condition" that leads to use of "dangerous paths," probably related to an untrusted search path vulnerability.
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Analysis
by VulDB Data Team • 06/23/2019
The vulnerability identified as CVE-2006-3500 resides within the dynamic linker component known as dyld in Apple Mac OS X version 10.4.7, representing a critical security flaw that enables local attackers to execute arbitrary code on affected systems. This issue stems from an improperly handled condition within the dynamic linking process that results in the use of dangerous paths during program execution. The vulnerability specifically manifests when the system processes dynamic libraries, creating an opportunity for malicious actors to manipulate the library loading sequence and subsequently gain unauthorized code execution privileges. The underlying flaw demonstrates characteristics consistent with untrusted search path vulnerabilities where the system fails to properly validate or sanitize the paths used during dynamic library resolution.
The technical implementation of this vulnerability involves the dynamic linker's handling of library search paths during program execution, where the system may inadvertently incorporate untrusted or attacker-controlled paths into the library loading sequence. This condition allows local users to place malicious libraries in locations that will be automatically loaded by the system, effectively bypassing normal security controls. The flaw operates at the system level where the dynamic linker does not properly validate the integrity or origin of libraries being loaded, creating a pathway for privilege escalation and code injection attacks. The improper handling of these conditions creates a scenario where the system's security model is circumvented through manipulation of the library search process.
From an operational perspective, this vulnerability presents significant risks to Mac OS X systems running version 10.4.7, as local users with minimal privileges can potentially elevate their access rights and execute malicious code with system-level privileges. The impact extends beyond simple code execution to encompass potential system compromise, data theft, and persistent backdoor installation. Attackers can exploit this vulnerability to install rootkits, modify system binaries, or establish covert communication channels without detection. The nature of the flaw means that any application relying on dynamic library loading could potentially be exploited, making the attack surface quite broad across the operating system's application ecosystem.
Mitigation strategies for CVE-2006-3500 should prioritize immediate system updates to the latest available Mac OS X versions that contain patches addressing the dynamic linker vulnerability. System administrators should implement strict library path controls and monitor for unauthorized modifications to system directories. The implementation of security measures such as code signing enforcement and dynamic library integrity checking can help prevent exploitation attempts. Additionally, organizations should consider implementing application whitelisting policies to restrict which libraries can be loaded by applications, thereby reducing the attack surface. This vulnerability aligns with CWE-427 Uncontrolled Search Path Elements and follows patterns consistent with ATT&CK technique T1059 Command and Scripting Interpreter, where local privilege escalation leads to system compromise through manipulation of dynamic linking mechanisms. The recommended remediation includes not only patching the operating system but also conducting thorough security audits of library loading processes and implementing proper access controls for system directories.