CVE-2017-7637 in Proxy Server
Summary
by MITRE
QNAP NAS application Proxy Server through version 1.2.0 allows remote attackers to run arbitrary OS commands against the system with root privileges.
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Analysis
by VulDB Data Team • 02/14/2020
The vulnerability identified as CVE-2017-7637 affects QNAP NAS application Proxy Server versions up to and including 1.2.0, presenting a critical remote code execution flaw that enables attackers to execute arbitrary operating system commands with root privileges. This vulnerability resides within the proxy server component of QNAP's network-attached storage solutions, which are widely deployed in enterprise and home network environments for file sharing, media streaming, and network services. The flaw represents a severe security weakness that fundamentally compromises the integrity and confidentiality of affected systems, as it allows remote attackers to gain complete administrative control without requiring authentication.
The technical implementation of this vulnerability stems from improper input validation within the proxy server's command processing functionality. Attackers can exploit this weakness by crafting malicious HTTP requests that contain specially formatted parameters which are then passed directly to underlying operating system commands without proper sanitization or escaping. This type of vulnerability aligns with CWE-77 and CWE-78 categories, specifically representing command injection flaws where user-supplied data is directly incorporated into command execution contexts. The vulnerability operates at the application layer and can be exploited remotely over network connections, making it particularly dangerous as it does not require physical access or local network presence to exploit.
The operational impact of CVE-2017-7637 extends far beyond simple privilege escalation, as it provides attackers with complete system compromise capabilities. Once exploited, attackers can access all stored data, modify system configurations, install malware, establish persistent backdoors, and potentially use the compromised system as a launch point for further attacks within the network. The root privileges granted by this vulnerability mean that attackers can bypass all standard access controls and security mechanisms that normally protect the system. This vulnerability is particularly concerning in enterprise environments where QNAP devices often serve as central storage and network services platforms, potentially allowing attackers to gain access to sensitive corporate data and critical infrastructure components.
Security professionals should immediately implement mitigations including applying the vendor-provided patches released in version 1.2.1 and later of the QNAP Proxy Server application. Network segmentation and firewall rules should be implemented to restrict access to affected devices, particularly limiting exposure to untrusted networks. Additionally, monitoring for suspicious HTTP request patterns and unusual command execution activities should be enabled to detect potential exploitation attempts. The vulnerability demonstrates the importance of input validation and proper sanitization of user-supplied data in web applications, aligning with ATT&CK technique T1059.001 for command and script injection. Organizations should also conduct comprehensive vulnerability assessments to identify other potentially affected QNAP devices and ensure all network services are properly updated and secured. Regular security audits and network monitoring are essential to prevent exploitation of similar vulnerabilities in the future.