CVE-2006-3506 in Xsan
Summary
by MITRE
Buffer overflow in the Xsan Filesystem driver on Mac OS X 10.4.7 and OS X Server 10.4.7 allows local users with Xsan write access, to execute arbitrary code via unspecified vectors related to "processing a path name."
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Analysis
by VulDB Data Team • 07/22/2024
The vulnerability identified as CVE-2006-3506 represents a critical buffer overflow flaw within the Xsan Filesystem driver component of Apple's Mac OS X 10.4.7 operating system and OS X Server 10.4.7. This security weakness specifically affects systems utilizing the Xsan distributed filesystem implementation, which was designed to provide shared storage access across multiple Macintosh computers in a networked environment. The flaw manifests when the filesystem driver processes path names, creating an exploitable condition that can be leveraged by authenticated local users who possess write permissions within the Xsan environment. The vulnerability's classification aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. This particular implementation flaw demonstrates the inherent risks associated with complex filesystem drivers that must handle various input validation scenarios while maintaining system stability and security.
The technical exploitation of this buffer overflow vulnerability occurs through the improper handling of path name processing within the Xsan driver's kernel space operations. When a local user with write access submits a specially crafted path name to the filesystem, the driver fails to properly validate the input length against allocated buffer boundaries. This allows malicious input to overflow into adjacent memory regions, potentially overwriting critical control data such as return addresses, function pointers, or other executable code segments. The attack vector is particularly concerning because it requires only local access with write privileges rather than network-based exploitation, making it more accessible to attackers who have already gained some level of system foothold. The vulnerability's impact is amplified by the fact that successful exploitation can result in arbitrary code execution with the privileges of the Xsan driver process, which typically operates with elevated system permissions. This scenario creates a direct pathway for privilege escalation attacks that could compromise the entire system.
From an operational standpoint, this vulnerability poses significant risks to organizations utilizing Mac OS X Server environments with Xsan implementations, particularly those with multiple users who require write access to shared filesystem resources. The local privilege escalation aspect means that even users with limited access rights can potentially gain complete system control, making it a critical concern for enterprise security posture. The attack scenario typically involves an attacker who has already established a presence on the system through other means, such as legitimate user access or a successful phishing attack, and then leverages this existing access to exploit the buffer overflow. Security professionals should note that the vulnerability affects systems running Mac OS X 10.4.7 specifically, making it important to identify and patch affected systems within the enterprise environment. The exploitability of this condition aligns with ATT&CK technique T1068, which covers 'Local Privilege Escalation' through kernel exploits, and T1543, which addresses 'Create or Modify System Process' to maintain persistent access.
Organizations should prioritize immediate remediation of systems affected by CVE-2006-3506 through the application of Apple's official security patches and updates. The recommended mitigation strategy involves upgrading to a supported version of Mac OS X that contains the necessary security fixes for the Xsan filesystem driver. System administrators should also implement additional monitoring and access controls to detect potential exploitation attempts, particularly focusing on unusual path name patterns or unexpected filesystem operations within Xsan environments. The vulnerability demonstrates the importance of maintaining up-to-date security patches across all system components, including specialized filesystem drivers that may not receive the same level of attention as core operating system components. Network segmentation and privilege minimization practices should be reinforced to limit the potential impact of such vulnerabilities, ensuring that even if exploitation occurs, the attacker's access remains constrained to prevent broader system compromise. Regular security assessments and vulnerability scanning should include checks for outdated filesystem drivers and ensure that all system components maintain current security configurations to prevent similar vulnerabilities from being exploited in the future.