CVE-2018-11345 in AS6202T ADM
Summary
by MITRE
An unrestricted file upload vulnerability in upload.cgi in ASUSTOR AS6202T ADM 3.1.0.RFQ3 allows attackers to upload supplied data via the POST parameter filename. This can be used to place attacker controlled code on the file system that can then be executed. Further, the filename parameter is vulnerable to path traversal and allows the attacker to place the file anywhere on the system.
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Analysis
by VulDB Data Team • 02/07/2020
The vulnerability identified as CVE-2018-11345 represents a critical unrestricted file upload flaw in the ASUSTOR AS6202T ADM 3.1.0.RFQ3 firmware, specifically within the upload.cgi component. This issue manifests as a severe security weakness that directly compromises the integrity and confidentiality of the affected system. The vulnerability stems from inadequate input validation and sanitization mechanisms within the file upload process, allowing malicious actors to bypass normal security controls and execute arbitrary code on the target device. The flaw exists in the handling of the POST parameter named filename, which provides attackers with direct control over the file naming and placement process.
The technical exploitation of this vulnerability occurs through a straightforward yet dangerous attack vector. Attackers can manipulate the filename parameter to upload malicious files with arbitrary code, potentially including web shells, backdoors, or other malicious executables. The vulnerability extends beyond simple file upload capabilities by incorporating path traversal mechanisms through the filename parameter, enabling attackers to navigate the file system and place malicious files in critical system directories. This path traversal capability significantly amplifies the impact, as it allows attackers to overwrite system files, install persistent backdoors, or create malicious scripts in locations that would otherwise be protected or restricted.
The operational impact of CVE-2018-11345 is devastating for organizations relying on ASUSTOR ADM systems, particularly those using the AS6202T model. Successful exploitation provides attackers with full system compromise capabilities, including the ability to execute arbitrary commands, access sensitive data, and maintain persistent access to the network. The vulnerability effectively transforms the affected device into a potential command and control server, enabling attackers to use it as a launching point for further network infiltration. This threat is particularly concerning in enterprise environments where these devices often serve as network infrastructure components, potentially providing attackers with access to internal networks and sensitive organizational resources.
Security professionals should recognize this vulnerability as a classic example of CWE-434 Unrestricted Upload of File with Dangerous Type, which falls under the broader category of insecure file handling practices. The attack surface aligns with several MITRE ATT&CK techniques including T1059 Command and Scripting Interpreter for executing malicious code, T1078 Valid Accounts for maintaining persistent access, and T1566 Phishing for initial access. Organizations must implement immediate mitigations including firmware updates from ASUSTOR, network segmentation to isolate affected devices, and enhanced monitoring for suspicious file upload activities. The vulnerability also highlights the importance of input validation, proper file type checking, and secure coding practices in preventing similar issues in network infrastructure devices.