CVE-2023-45685 in MFT Server
Summary
by MITRE • 10/25/2023
Insufficient path validation when extracting a zip archive in South River Technologies' Titan MFT and Titan SFTP servers on Windows and Linux allows an authenticated attacker to write a file to any location on the filesystem via path traversal
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Analysis
by VulDB Data Team • 09/16/2024
The vulnerability identified as CVE-2023-45685 represents a critical path traversal flaw within South River Technologies' Titan MFT and Titan SFTP server implementations across both Windows and Linux operating systems. This security weakness stems from inadequate validation of file paths during zip archive extraction processes, creating a significant attack vector for authenticated adversaries who can leverage this flaw to compromise system integrity and potentially escalate privileges. The vulnerability specifically affects the handling of file paths within archive extraction routines where the software fails to properly sanitize or validate input paths, allowing attackers to manipulate the extraction destination through maliciously crafted zip files.
The technical exploitation of this vulnerability occurs when an authenticated user uploads or processes a specially crafted zip archive containing malicious path references. During the extraction process, the software does not adequately validate the target paths, enabling attackers to specify absolute paths or traverse directories using sequences like "../" to escape the intended extraction directory. This flaw directly maps to CWE-22 Path Traversal and CWE-73 Path Traversal, both of which are classified under the Common Weakness Enumeration framework as critical security issues that allow attackers to access files or directories outside the intended scope. The vulnerability exists at the intersection of improper input validation and insufficient access control mechanisms, making it particularly dangerous in enterprise environments where these servers handle sensitive data transfers.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it can enable attackers to overwrite critical system files, inject malicious code, or establish persistent backdoors within the target environment. Attackers can leverage this vulnerability to modify configuration files, inject malicious binaries, or even compromise the integrity of the entire file transfer infrastructure. The implications are particularly severe in environments where these servers are used for secure file transfers, as the vulnerability undermines the fundamental security assumptions of the file transfer process. From an attacker perspective, this vulnerability aligns with ATT&CK technique T1074.001 for Data from Local System and T1566.001 for Phishing, as it provides a means to achieve unauthorized access to system resources through legitimate file transfer operations.
Mitigation strategies for this vulnerability should include immediate patching of affected systems, implementing strict path validation controls during archive extraction, and deploying network segmentation to limit access to these servers. Organizations should also consider implementing file integrity monitoring solutions to detect unauthorized file modifications and establish robust access controls to minimize the impact of potential exploitation. The remediation process requires comprehensive testing of updated software versions to ensure that path validation mechanisms are properly implemented and that no regressions have been introduced in the file transfer functionality. Additionally, administrators should conduct thorough security assessments of their file transfer infrastructure to identify and remediate similar vulnerabilities that may exist in other components of their security ecosystem.