CVE-2017-15618 in WVR
Summary
by MITRE
TP-Link WVR, WAR and ER devices allow remote authenticated administrators to execute arbitrary commands via command injection in the new-enable variable in the pptp_client.lua file.
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Analysis
by VulDB Data Team • 12/22/2019
The vulnerability identified as CVE-2017-15618 affects TP-Link WVR, WAR, and ER series network devices, representing a critical command injection flaw that enables remote authenticated administrators to execute arbitrary code on affected systems. This vulnerability exists within the pptp_client.lua file where the new-enable variable is processed without proper input validation or sanitization. The flaw allows an attacker with administrative credentials to inject malicious commands that are then executed by the underlying operating system, potentially leading to complete system compromise and unauthorized access to network resources.
From a technical perspective, this vulnerability demonstrates a classic command injection vulnerability classified under CWE-77, which occurs when user-supplied input is directly incorporated into system commands without adequate sanitization. The affected devices process the new-enable parameter in the pptp_client.lua file, where the input is concatenated directly into shell commands without proper escaping or validation mechanisms. This creates an opportunity for attackers to manipulate the command execution flow by injecting malicious shell commands through the vulnerable parameter, effectively bypassing authentication mechanisms and gaining elevated privileges within the device's operating environment.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with persistent access to network infrastructure that could be leveraged for further lateral movement within the network. Once exploited, the compromised device can serve as a pivot point for attacking other systems, potentially enabling man-in-the-middle attacks, data exfiltration, or disruption of network services. The vulnerability affects multiple TP-Link device models including WVR, WAR, and ER series, which are commonly deployed in enterprise and small office environments, making the potential attack surface substantial and the impact significant for organizations relying on these devices for network connectivity and security.
Security practitioners should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the techniques related to command and control, privilege escalation, and persistence. The vulnerability aligns with ATT&CK technique T1059.001 for command and script interpreter, where adversaries use legitimate system tools to execute malicious code. Organizations should implement immediate mitigations including firmware updates from TP-Link, network segmentation to limit administrative access, and monitoring for suspicious command execution patterns. Additionally, the vulnerability underscores the importance of input validation and secure coding practices, with organizations needing to review their own code for similar injection vulnerabilities and implement proper parameter sanitization mechanisms to prevent similar issues in their applications and systems.