CVE-2006-4396 in Mac OS X
Summary
by MITRE
The Apple Type Services (ATS) server in Mac OS X 10.4.8 and earlier does not securely create log files, which allows local users to create and modify arbitrary files via unspecified vectors, possibly relating to a symlink attack.
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Analysis
by VulDB Data Team • 07/22/2024
The vulnerability identified as CVE-2006-4396 affects Apple Type Services (ATS) server functionality within Mac OS X versions 10.4.8 and earlier, representing a significant security flaw in the operating system's file handling mechanisms. This issue stems from inadequate security measures during the creation of log files by the ATS server component, which is responsible for managing font services and type rendering within the macOS environment. The vulnerability specifically targets the server's inability to properly validate file creation operations, creating an exploitable condition that can be leveraged by local attackers to manipulate the file system.
The technical flaw manifests through unspecified vectors that enable attackers to manipulate file creation processes within the ATS server context, potentially allowing for symbolic link attacks that can redirect file operations to arbitrary locations. This represents a classic path traversal and file system manipulation vulnerability where the server fails to properly sanitize input parameters or validate the security context of file operations. The vulnerability is particularly concerning as it operates at the system level within the core type services infrastructure, potentially allowing attackers to modify critical system files or create malicious files with elevated privileges.
From an operational impact perspective, this vulnerability provides local users with the capability to execute arbitrary file creation and modification operations, potentially leading to system compromise, privilege escalation, or persistent backdoor installation. The attack vector involves leveraging the insecure file creation practices to establish symbolic links that redirect log file operations to sensitive system locations, enabling attackers to modify critical system components or inject malicious code into the font processing pipeline. This type of vulnerability can be exploited to undermine the integrity of the entire macOS type services subsystem, affecting font rendering, application compatibility, and overall system security posture.
The vulnerability aligns with CWE-362, which addresses concurrent execution using shared resources with improper synchronization, and relates to CWE-22, path traversal vulnerabilities, as the insecure file handling creates opportunities for attackers to manipulate file paths and access unauthorized locations. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence mechanisms, as attackers can leverage the ability to create or modify arbitrary files to establish persistent access or escalate their privileges within the system. The impact extends beyond immediate file system manipulation to potentially compromise the integrity of the entire font processing infrastructure and associated applications that depend on ATS for type services.
Mitigation strategies should focus on immediate system updates to Mac OS X versions that address this vulnerability, along with comprehensive security hardening measures for the ATS server component. System administrators should implement strict file system permissions and access controls for ATS-related directories, monitor for suspicious file creation patterns, and establish regular security audits of type services components. Additionally, organizations should consider implementing network segmentation and privilege separation to limit the potential impact of successful exploitation attempts, while maintaining detailed logging and monitoring capabilities to detect unauthorized file system modifications. The vulnerability underscores the critical importance of proper file handling security practices and the need for comprehensive security testing of system-level services that handle user input or file operations.