CVE-2007-1744 in Workstation
Summary
by MITRE
Directory traversal vulnerability in the Shared Folders feature for VMware Workstation before 5.5.4, when a folder is shared, allows users on the guest system to write to arbitrary files on the host system via the "Backdoor I/O Port" interface.
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Analysis
by VulDB Data Team • 08/02/2019
The vulnerability described in CVE-2007-1744 represents a critical directory traversal flaw within VMware Workstation's Shared Folders functionality that existed prior to version 5.5.4. This security weakness specifically affects the communication interface known as the "Backdoor I/O Port" which serves as a mechanism for guest operating systems to interact with the host system. The vulnerability enables unauthorized file operations by exploiting improper input validation within the shared folder implementation, creating a pathway for malicious actors to escalate their privileges and gain write access to arbitrary files on the host system. The flaw essentially allows a compromised guest environment to bypass normal file system access controls and directly manipulate host files through the virtualization layer's communication protocols.
From a technical perspective, this vulnerability operates through a classic path traversal attack vector where insufficient validation of file paths and access controls within the VMware Workstation's shared folder implementation permits guest users to craft specific requests that traverse directory structures beyond the intended shared folder boundaries. The Backdoor I/O Port interface, designed for efficient communication between host and guest systems, becomes a conduit for malicious file operations when proper boundary checking fails. This type of vulnerability falls under the CWE-22 category of "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')" and demonstrates how virtualization platforms can introduce unique attack surfaces that differ from traditional operating system security models.
The operational impact of this vulnerability extends far beyond simple unauthorized file access, as it provides a foundation for more sophisticated attacks within the virtualized environment. An attacker with access to a guest system could potentially overwrite critical system files, inject malicious code into the host operating system, or manipulate configuration files that control the virtualization environment itself. The implications are particularly severe in multi-user environments where multiple virtual machines share the same host system, as this vulnerability could enable lateral movement attacks between different guest systems. According to ATT&CK framework, this vulnerability maps to T1059.001 (Command and Scripting Interpreter: PowerShell) and T1074 (Data Staged) as attackers could leverage the compromised guest system to stage malicious payloads and execute commands on the host system, potentially leading to complete host compromise.
The mitigation strategy for CVE-2007-1744 requires immediate patching of VMware Workstation installations to version 5.5.4 or later, which addressed the directory traversal flaw through improved input validation and access control mechanisms. Additionally, administrators should implement network segmentation to limit guest system access to host resources, disable unnecessary shared folders, and employ principle of least privilege configurations for virtual machine users. The vulnerability highlights the importance of proper input validation and access control implementation in virtualization platforms, as these systems must maintain strict isolation between host and guest environments while providing necessary communication channels. Security monitoring should include detection of unusual file access patterns and attempts to write to system directories from guest environments, as these activities could indicate exploitation of similar vulnerabilities in virtualization infrastructure.