CVE-2018-11342 in AS6202T ADM
Summary
by MITRE
A path traversal vulnerability in fileExplorer.cgi in ASUSTOR AS6202T ADM 3.1.0.RFQ3 allows attackers to arbitrarily specify a path to a file on the system to create folders via the dest_folder parameter.
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Analysis
by VulDB Data Team • 02/07/2020
The vulnerability identified as CVE-2018-11342 represents a critical path traversal flaw in the fileExplorer.cgi component of ASUSTOR AS6202T ADM 3.1.0.RFQ3 firmware. This vulnerability resides within the web-based administration interface of the device, specifically in how it processes user input through the dest_folder parameter. The flaw enables attackers to manipulate file system paths and create arbitrary directories on the affected system, potentially leading to unauthorized file system modifications and system compromise.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the fileExplorer.cgi script. When attackers provide malicious input through the dest_folder parameter, the application fails to properly validate or sanitize the path specification before executing file system operations. This allows for directory traversal attacks where an attacker can specify paths outside the intended directory structure, potentially accessing or modifying sensitive system files. The vulnerability specifically affects the folder creation functionality, making it possible for attackers to establish persistent access points or hide malicious files within the system.
From an operational perspective, this vulnerability presents significant risks to organizations deploying ASUSTOR storage solutions. Attackers who exploit this flaw can gain unauthorized access to the file system, potentially leading to data exfiltration, system corruption, or privilege escalation. The ability to create arbitrary folders allows for persistent threat actor presence within the network, as malicious directories can be established to house backdoor tools or hidden data. The vulnerability is particularly concerning in enterprise environments where these devices often serve as centralized storage solutions with access to sensitive corporate data.
The security implications extend beyond simple file system manipulation, as this vulnerability can be leveraged as a stepping stone for more sophisticated attacks. According to the MITRE ATT&CK framework, this vulnerability aligns with techniques involving path traversal and privilege escalation. The CWE (Common Weakness Enumeration) classification for this issue would fall under CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. Organizations should consider implementing network segmentation and access controls to limit exposure, while also ensuring that all ASUSTOR devices are updated to versions that address this vulnerability. Regular security audits and monitoring for unauthorized file system modifications should be implemented as part of comprehensive security posture management.