CVE-2018-0635 in HC100RC
Summary
by MITRE
Aterm HC100RC Ver1.0.1 and earlier allows attacker with administrator rights to execute arbitrary OS commands via filename parameter.
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Analysis
by VulDB Data Team • 04/27/2020
The vulnerability identified as CVE-2018-0635 affects Aterm HC100RC devices running firmware version 1.0.1 and earlier, representing a critical command injection flaw that enables authenticated attackers to execute arbitrary operating system commands. This vulnerability resides within the device's web interface handling of filename parameters, where insufficient input validation allows maliciously crafted parameters to be interpreted as executable commands rather than simple file names. The flaw specifically manifests when administrators interact with the device's management interface, creating an attack surface that can be exploited by individuals who have already gained administrative credentials.
The technical implementation of this vulnerability stems from improper sanitization of user-supplied input within the filename parameter processing logic. When administrators submit requests containing filename parameters, the system fails to properly validate or escape special characters that could be interpreted by the underlying operating system. This represents a classic command injection vulnerability categorized under CWE-77, which specifically addresses improper neutralization of special elements used in command execution. The vulnerability allows an attacker with administrative privileges to bypass normal access controls and execute arbitrary code on the device, potentially leading to complete system compromise and unauthorized access to network resources.
The operational impact of this vulnerability extends beyond simple command execution, as it provides attackers with the ability to manipulate the device's operating environment, install malicious software, modify system configurations, or establish persistent access points. The attack requires only administrative credentials, which makes the vulnerability particularly dangerous as it can be exploited by insiders or compromised administrators. Once exploited, the attacker can leverage the device as a foothold for further network exploration, potentially accessing other connected systems or using the compromised device as a pivot point for lateral movement within the network infrastructure.
Security professionals should implement immediate mitigations including firmware updates to versions that address the command injection vulnerability, network segmentation to limit access to administrative interfaces, and strict access control measures to prevent unauthorized administrative privilege escalation. The vulnerability also aligns with ATT&CK technique T1059.001, which covers command and scripting interpreter execution, and T1566, which addresses credential harvesting and privilege escalation. Organizations should conduct thorough vulnerability assessments to identify all affected devices and ensure proper patch management protocols are in place to prevent exploitation. Additional defensive measures include implementing web application firewalls to monitor for suspicious parameter patterns and establishing robust logging and monitoring capabilities to detect potential exploitation attempts.