CVE-2018-12980 in e!DISPLAY 762-3000
Summary
by MITRE
An issue was discovered on WAGO e!DISPLAY 762-3000 through 762-3003 devices with firmware before FW 02. The vulnerability allows an authenticated user to upload arbitrary files to the file system with the permissions of the web server.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 06/25/2024
The vulnerability identified as CVE-2018-12980 affects WAGO e!DISPLAY 762-3000 through 762-3003 devices running firmware versions prior to FW 02. This represents a critical security flaw that undermines the integrity of the device's file system security model. The affected devices are industrial display systems commonly used in manufacturing and automation environments where security is paramount. These devices are designed to operate in controlled industrial settings but lack proper input validation and access control mechanisms that would prevent unauthorized file operations.
The technical flaw manifests as an insecure file upload functionality that permits authenticated users to bypass normal file system permissions and upload arbitrary files with the privileges of the web server process. This vulnerability stems from insufficient validation of file upload requests and inadequate restriction of file system operations. The flaw allows an attacker who has already established authentication credentials to escalate their privileges through file system manipulation. This represents a classic path to privilege escalation where legitimate user access is leveraged to gain elevated system permissions.
The operational impact of this vulnerability is severe and multifaceted within industrial control environments. An authenticated attacker could potentially upload malicious executables, web shells, or other malicious payloads that would execute with web server privileges. This creates a persistent threat vector that could lead to complete system compromise, data exfiltration, or disruption of industrial processes. The vulnerability affects devices that are often deployed in critical infrastructure settings where unauthorized access could result in production downtime, safety hazards, or regulatory compliance violations. The web server context provides access to the device's file system and potentially to other network resources that the device may have access to.
Mitigation strategies for this vulnerability should focus on immediate firmware updates to version FW 02 or later, which presumably address the insecure file upload functionality. Network segmentation and access control measures should be implemented to limit the exposure of these devices to untrusted networks. Regular security audits and monitoring of file system changes should be established to detect unauthorized file uploads. The vulnerability aligns with CWE-434 which describes insecure file upload vulnerabilities, and represents a pathway for techniques described in the ATT&CK framework under privilege escalation and persistence tactics. Organizations should also implement principle of least privilege concepts for web server processes and ensure proper input validation is enforced at all levels of the application stack.