CVE-2006-4398 in Mac OS X
Summary
by MITRE
Multiple buffer overflows in the Apple Type Services (ATS) server in Mac OS X 10.4 through 10.4.8 allow local users to execute arbitrary code via crafted service requests.
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Analysis
by VulDB Data Team • 07/22/2024
The vulnerability described in CVE-2006-4398 represents a critical security flaw within Apple Type Services, a core component of Mac OS X operating systems. This issue affects versions 10.4 through 10.4.8, indicating a significant window of exposure where systems were susceptible to exploitation. Apple Type Services functions as a server component responsible for handling font-related operations and type services within the macOS environment, making it a critical subsystem that requires robust security controls.
The technical nature of this vulnerability manifests through multiple buffer overflow conditions within the ATS server implementation. Buffer overflows occur when more data is written to a fixed-length buffer than it can accommodate, causing adjacent memory to be overwritten. In this case, the flaw exists in how the ATS server processes service requests from local users, suggesting that malicious input data can trigger memory corruption that leads to arbitrary code execution. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions that can result in code execution.
The operational impact of this vulnerability is severe as it allows local users to escalate privileges and execute arbitrary code on affected systems. Since the exploit requires only local access, it can be leveraged by users who already have system access, potentially enabling privilege escalation attacks or the execution of malicious payloads. The local execution requirement means that attackers do not need network access or remote exploitation capabilities, making this vulnerability particularly dangerous in environments where local access is possible. This characteristic aligns with ATT&CK technique T1068, which covers local privilege escalation through exploitation of system vulnerabilities.
The vulnerability's exploitation pathway involves crafting specific service requests that trigger the buffer overflow conditions within the ATS server. These crafted requests likely contain malformed data that exceeds buffer boundaries, causing stack corruption and potentially allowing an attacker to control program execution flow. The fact that multiple buffer overflows exist suggests the vulnerability is not isolated to a single code path but represents a broader architectural weakness in how the ATS server handles input validation and memory management. This type of vulnerability demonstrates poor defensive programming practices that violate fundamental security principles.
Mitigation strategies for this vulnerability should focus on immediate system updates and patches provided by Apple to address the buffer overflow conditions in the ATS server. System administrators should prioritize applying the official security patches as soon as they become available, as these updates typically include memory bounds checking and input validation improvements. Additionally, implementing proper access controls and monitoring for unusual service requests can help detect potential exploitation attempts. The vulnerability highlights the importance of regular security updates and the need for comprehensive input validation across all system components, particularly those handling external data processing. Organizations should also consider implementing least privilege principles to limit the potential impact of local privilege escalation attacks, ensuring that even if exploitation occurs, the attacker's access remains restricted.