CVE-2018-20092 in ThingWorx Platform
Summary
by MITRE
PTC ThingWorx Platform through 8.3.0 is vulnerable to a directory traversal attack on ZIP files via a POST request.
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Analysis
by VulDB Data Team • 04/21/2020
The vulnerability identified as CVE-2018-20092 affects the PTC ThingWorx Platform version 8.3.0 and earlier, presenting a critical directory traversal flaw that can be exploited through malicious ZIP file uploads. This weakness resides in the platform's handling of file extraction processes, specifically when processing ZIP archives submitted via POST requests. The vulnerability allows attackers to manipulate file paths within ZIP archives to traverse directories on the server filesystem, potentially enabling arbitrary file write operations or information disclosure. The flaw stems from insufficient input validation and path sanitization during decompression operations, creating an avenue for attackers to bypass normal file access controls and gain unauthorized access to sensitive system resources.
The technical implementation of this vulnerability involves the manipulation of relative path references within ZIP file entries, commonly referred to as path traversal or directory traversal attacks. When the ThingWorx platform processes uploaded ZIP files, it fails to properly validate or sanitize the file paths contained within these archives. Attackers can craft malicious ZIP files containing entries with paths such as ../../../etc/passwd or similar directory traversal sequences that, when extracted, overwrite critical system files or place malicious content in unintended locations. This type of vulnerability is classified under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The attack vector leverages the platform's insufficient validation mechanisms, allowing the extraction process to interpret specially crafted file paths as legitimate system commands rather than simple file names.
The operational impact of CVE-2018-20092 extends beyond simple file access violations, potentially enabling complete system compromise through a series of interconnected attack techniques. An attacker who successfully exploits this vulnerability could gain the ability to upload malicious files to critical system directories, execute arbitrary code, or extract sensitive configuration data from the platform. The vulnerability's severity is compounded by the fact that it can be triggered through simple HTTP POST requests, making it accessible to attackers with minimal privileges or specialized tools. This weakness could facilitate privilege escalation attacks, where attackers leverage the directory traversal capability to modify system binaries or configuration files, potentially leading to persistent backdoor access. The platform's role in industrial IoT environments further amplifies the risk, as compromised systems could affect critical infrastructure operations and data integrity across connected devices and applications.
Mitigation strategies for CVE-2018-20092 should focus on implementing robust input validation and path sanitization mechanisms within the platform's file handling processes. Organizations should immediately upgrade to PTC ThingWorx Platform versions that address this vulnerability, as PTC has released patches and updates to resolve the directory traversal issue. Security controls should include implementing strict file path validation that rejects any entries containing directory traversal sequences such as ../ or ..\. Additionally, the platform should enforce proper file permissions and access controls, ensuring that decompression operations occur within isolated, restricted directories that cannot access critical system resources. Network-level protections such as web application firewalls should be configured to monitor and block suspicious POST requests containing potentially malicious ZIP file content. Organizations should also implement comprehensive logging and monitoring of file upload activities to detect anomalous behavior that might indicate exploitation attempts. The implementation of these controls aligns with ATT&CK technique T1059.007, which covers the use of script-based commands, as attackers often leverage directory traversal vulnerabilities to execute malicious payloads through compromised platforms. Regular security assessments and penetration testing should be conducted to verify that the implemented mitigations remain effective against evolving attack vectors targeting similar vulnerabilities in industrial IoT platforms.