CVE-2017-17739 in Digital Signage
Summary
by MITRE
The BrightSign Digital Signage (4k242) device (Firmware 6.2.63 and below) has directory traversal via the /storage.html rp parameter, allowing an attacker to read or write to files.
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Analysis
by VulDB Data Team • 08/18/2024
The BrightSign Digital Signage device running firmware versions 6.2.63 and below contains a critical directory traversal vulnerability in the /storage.html web interface component. This flaw exists within the rp parameter processing mechanism where user input is not properly sanitized or validated before being used to construct file paths. The vulnerability allows remote attackers to manipulate the rp parameter to access arbitrary files on the device filesystem, potentially enabling both information disclosure and arbitrary file write operations.
This directory traversal vulnerability represents a significant security weakness that directly violates the principle of least privilege and proper input validation. The flaw enables attackers to bypass normal access controls and navigate the filesystem beyond intended boundaries. According to CWE-22, this vulnerability maps to the classic directory traversal or path traversal attack pattern where insufficient input sanitization allows attackers to access files outside the intended directory structure. The attack vector is particularly concerning as it operates over the network interface without requiring authentication, making it accessible to any remote attacker.
The operational impact of this vulnerability extends beyond simple file access, as it provides potential attackers with the ability to modify critical system files, inject malicious code, or extract sensitive configuration data. Attackers could leverage this vulnerability to gain persistent access to the device, potentially compromising entire digital signage networks that rely on BrightSign appliances. The exposure of system files may reveal credentials, configuration parameters, or other sensitive information that could be used for further attacks within the network infrastructure.
Mitigation strategies should include immediate firmware updates to versions that address this directory traversal vulnerability, as BrightSign has released patches for affected devices. Network segmentation and firewall rules should be implemented to restrict access to the device's web interface to trusted networks only. Additionally, administrators should conduct thorough security assessments of all digital signage deployments to identify similar vulnerabilities in other devices within the network. The ATT&CK framework categorizes this type of vulnerability under T1059 Command and Scripting Interpreter and T1083 File and Directory Discovery, indicating the potential for both command execution and reconnaissance activities. Regular security monitoring and vulnerability scanning should be implemented to detect similar issues in other networked devices and prevent exploitation of similar weaknesses in the broader digital signage ecosystem.