CVE-2005-3712 in Mac OS X
Summary
by MITRE
Heap-based buffer overflow in rsync in Mac OS X 10.4 through 10.4.5 allows remote authenticated users to execute arbitrary code via long extended attributes.
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Analysis
by VulDB Data Team • 06/15/2019
The vulnerability described in CVE-2005-3712 represents a critical heap-based buffer overflow within the rsync utility implementation on Mac OS X versions 10.4 through 10.4.5. This flaw exists in the handling of extended attributes during file synchronization operations, creating a remote code execution vector for authenticated attackers who can manipulate the rsync process. The vulnerability specifically affects the memory management routines responsible for processing extended attributes, which are metadata elements that can be attached to files and directories in the filesystem.
The technical implementation of this vulnerability stems from inadequate bounds checking when processing extended attribute data structures within rsync's memory allocation mechanisms. When rsync encounters extended attributes that exceed predetermined buffer size limits, the application fails to properly validate input lengths before copying data into heap-allocated memory regions. This classic buffer overflow condition allows an attacker to overwrite adjacent memory locations, potentially corrupting program execution flow and enabling arbitrary code execution. The heap-based nature of the vulnerability means that the overflow occurs in dynamically allocated memory rather than on the stack, making exploitation more complex but still highly effective.
From an operational perspective, this vulnerability presents significant risk to systems running affected versions of Mac OS X, particularly those that utilize rsync for file synchronization tasks. The authenticated nature of the exploit requires an attacker to first establish a valid user account on the target system, which may be achieved through various means including credential theft, social engineering, or prior compromise of system access. Once authenticated, an attacker can leverage this vulnerability to execute malicious code with the privileges of the rsync process, potentially leading to complete system compromise. The impact extends beyond individual system compromise to include potential data exfiltration, privilege escalation, and establishment of persistent backdoors within network environments.
The vulnerability aligns with CWE-121, which categorizes heap-based buffer overflow conditions, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation would likely involve execution of malicious code through shell commands or system calls. Organizations should prioritize immediate patching of affected systems to address this vulnerability, as the window for exploitation remains open in unpatched environments. Additionally, system administrators should implement network segmentation and access controls to limit the potential impact of successful exploitation, while monitoring for suspicious rsync activity or unauthorized extended attribute modifications. The vulnerability underscores the importance of proper input validation and memory management practices in network services, particularly those handling user-provided data in file synchronization protocols.