CVE-2004-0538 in Mac OS X Server
Summary
by MITRE
LaunchServices in Mac OS X 10.3.4 and 10.2.8 automatically registers and executes new applications, which could allow attackers to execute arbitrary code without warning the user.
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Analysis
by VulDB Data Team • 07/16/2019
The vulnerability described in CVE-2004-0538 resides within the LaunchServices framework of Mac OS X versions 10.3.4 and 10.2.8, representing a critical security flaw that fundamentally undermines user system integrity. This issue stems from the automatic registration and execution mechanisms that LaunchServices employs when new applications are installed or discovered on the system. The flaw operates by bypassing normal user consent procedures that should typically occur during application installation, effectively allowing malicious software to execute without any explicit user notification or approval process.
The technical implementation of this vulnerability involves the LaunchServices component's failure to properly validate or authenticate application sources before automatically registering them within the system's application framework. This automatic behavior creates a dangerous precedent where any executable file placed in specific system directories or discovered through system scans can be immediately registered and executed without user awareness. The underlying mechanism operates at a low system level within the operating system's core services, making it particularly difficult to detect and prevent through standard user interface warnings or security prompts.
From an operational impact perspective, this vulnerability represents a severe threat to system security as it enables attackers to perform unauthorized code execution without triggering any user-facing security warnings. The implications extend beyond simple malware installation to encompass potential privilege escalation scenarios where attackers can leverage this automatic execution to gain deeper system access. According to CWE classification, this vulnerability maps to CWE-1035 which deals with the improper neutralization of special elements used in a command, and more specifically relates to CWE-94 which addresses the execution of arbitrary code. The attack surface is particularly concerning because it operates at the system level rather than application level, allowing for broader impact across the entire operating environment.
The vulnerability's exploitation potential aligns with several ATT&CK techniques including T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation. Attackers can leverage this flaw by placing malicious executables in directories that LaunchServices monitors automatically, thereby bypassing traditional security controls and user awareness mechanisms. The lack of user notification creates a stealthy attack vector that can persist undetected for extended periods, potentially allowing for data exfiltration, system compromise, or further attack progression. This vulnerability essentially removes the user's ability to make informed decisions about application execution, fundamentally undermining the principle of least privilege and user consent that forms the foundation of modern operating system security models.
Mitigation strategies for this vulnerability require immediate system updates to patched versions of Mac OS X where the LaunchServices behavior has been corrected to properly enforce user consent and application validation. System administrators should implement additional monitoring controls to detect unauthorized application installations and automatically scan for suspicious LaunchServices registrations. The recommended approach includes disabling automatic application registration where possible, implementing strict file system permissions, and establishing comprehensive logging of application execution events. Organizations should also consider implementing application whitelisting policies that prevent execution of unauthorized applications, particularly in environments where security is paramount. The vulnerability highlights the critical importance of proper privilege separation and the need for robust application validation mechanisms within core operating system services, emphasizing that system-level components must never bypass user security controls without explicit justification and user consent.