CVE-2007-4693 in Mac OS X
Summary
by MITRE
The SecurityAgent component in Mac OS X 10.4 through 10.4.10 allows attackers with physical access to bypass the authentication dialog of the screen saver and send keystrokes to a process, related to "handling of keyboard focus between secure text fields."
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Analysis
by VulDB Data Team • 06/07/2025
The vulnerability identified as CVE-2007-4693 resides within the SecurityAgent component of Mac OS X versions 10.4 through 10.4.10, representing a critical flaw in the operating system's authentication mechanisms. This security weakness specifically targets the screen saver authentication dialog and enables unauthorized access through physical proximity attacks. The vulnerability stems from improper handling of keyboard focus between secure text fields, creating an exploitable condition that undermines the fundamental security assumptions of the system's user interface authentication processes. The flaw represents a significant compromise in the operating system's ability to protect against unauthorized access when physical access is granted to a system.
The technical implementation of this vulnerability exploits the manner in which the SecurityAgent component manages keyboard focus transitions between secure text input fields during authentication. When a user initiates the screen saver, the system should enforce strict authentication requirements before allowing access to the system. However, the flaw allows attackers with physical access to manipulate the keyboard focus behavior, enabling them to send keystrokes directly to processes running in the background. This occurs because the system fails to properly validate or restrict keyboard input flow when transitioning between secure text fields, creating a pathway for malicious input injection that bypasses the intended authentication sequence. The vulnerability operates at the user interface level, specifically targeting the interaction between the screen saver authentication dialog and the underlying system processes that handle user input.
The operational impact of CVE-2007-4693 extends beyond simple unauthorized access, as it provides attackers with a mechanism to execute arbitrary commands or input sequences through the compromised keyboard focus handling. This vulnerability enables what security researchers classify as a "physical access attack" scenario where an attacker with proximity to a locked system can bypass authentication entirely. The implications are particularly severe in enterprise environments where physical security controls may be insufficient, as this vulnerability allows for potential data exfiltration, system compromise, or unauthorized administrative access. Attackers can exploit this flaw to inject malicious commands or credentials directly into running processes, effectively circumventing the screen saver's intended security function. The vulnerability's classification under CWE-254 indicates it represents a weakness in the system's handling of input validation and focus management, specifically in the context of secure authentication interfaces.
Mitigation strategies for this vulnerability require immediate system updates to the latest available versions of Mac OS X, as Apple released patches to address the specific keyboard focus handling issue. Organizations should implement comprehensive physical security measures including secure workstations, restricted access areas, and monitoring protocols to prevent unauthorized physical access to systems. The implementation of additional security controls such as automatic screen locking after periods of inactivity, enhanced authentication mechanisms, and regular security assessments can help reduce the attack surface. From a defensive perspective, this vulnerability aligns with ATT&CK technique T1547.001 related to registry run keys and startup folder modifications, though it operates at a lower level through user interface manipulation. System administrators should also consider implementing network-level protections and monitoring for suspicious keyboard input patterns that might indicate exploitation attempts, as the vulnerability fundamentally compromises the trust model between user input and system authentication processes.