CVE-2017-6443 in TMNet WebConfig
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in EPSON TMNet WebConfig 1.00 allows remote attackers to inject arbitrary web script or HTML via the W_AD1 parameter to Forms/oadmin_1.
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Analysis
by VulDB Data Team • 08/25/2024
The vulnerability identified as CVE-2017-6443 represents a critical cross-site scripting flaw within EPSON TMNet WebConfig version 1.00, specifically affecting the web-based administration interface used for configuring EPSON thermal printers and related network equipment. This issue resides in the Forms/oadmin_1 endpoint where the W_AD1 parameter fails to properly sanitize user input, creating an avenue for remote attackers to execute malicious scripts within the context of authenticated users' browsers. The vulnerability demonstrates characteristics consistent with CWE-79, which defines the classic cross-site scripting weakness where untrusted data is incorporated into web page content without proper validation or encoding mechanisms. The attack vector requires minimal privileges as the vulnerability is accessible through the web interface without requiring authentication, making it particularly dangerous for environments where the printer management interface is exposed to untrusted networks.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script code and submits it through the W_AD1 parameter in the Forms/oadmin_1 form. The web application fails to implement proper input validation or output encoding, allowing the malicious payload to be stored and subsequently executed whenever the affected page is rendered. This type of vulnerability falls under the ATT&CK technique T1059.001, where adversaries leverage web-based scripting to execute malicious code in the victim's browser context. The impact extends beyond simple script execution as the attacker can potentially steal session cookies, perform unauthorized actions on behalf of authenticated users, or redirect victims to malicious sites. Given that this affects printer management interfaces, the exploitation could lead to broader network compromise if the printer is connected to sensitive internal systems or if the attacker uses the compromised interface as a foothold for further reconnaissance.
The operational impact of CVE-2017-6443 significantly affects organizations utilizing EPSON TMNet WebConfig systems, particularly those with exposed printer management interfaces or those that do not properly segment their network infrastructure. The vulnerability's remote exploitability means that attackers can target these systems from outside the organization's network perimeter, potentially leading to unauthorized access to printer configurations, data exfiltration, or use of the compromised system as a pivot point for lateral movement. Organizations with multiple EPSON printers configured with web interfaces become especially vulnerable as a single compromised device can provide attackers with access to the entire printer management domain. The vulnerability's persistence through session management and the potential for cookie theft aligns with ATT&CK technique T1539, where adversaries harvest credentials and session information from compromised systems. Network administrators should consider the implications of this vulnerability in environments where printer interfaces are accessible to untrusted users or where the printer management systems are integrated with sensitive network resources.
Mitigation strategies for CVE-2017-6443 should prioritize immediate patching of affected EPSON TMNet WebConfig systems, as the vendor has released updates addressing this specific vulnerability. Network segmentation should be implemented to isolate printer management interfaces from general network traffic, particularly ensuring that these interfaces are not directly accessible from external networks. Input validation and output encoding mechanisms should be strengthened throughout the web application, with all user-supplied data being properly sanitized before being processed or displayed. Regular security assessments should include verification of web application configurations and input handling mechanisms to prevent similar vulnerabilities from being introduced. Organizations should also implement monitoring solutions that can detect anomalous behavior in printer management interfaces and establish incident response procedures specifically addressing web application compromises. The vulnerability serves as a reminder of the importance of secure coding practices and proper input validation in web applications, particularly those managing networked devices where exposure to external threats is common.