CVE-2019-18859 in AnywhereUSB
Summary
by MITRE
Digi AnywhereUSB 14 allows XSS via a link for the Digi Page.
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Analysis
by VulDB Data Team • 08/17/2025
The Digi AnywhereUSB 14 device presents a cross-site scripting vulnerability that arises from improper input validation within its web interface. This vulnerability specifically affects the Digi Page component which handles user-provided links and data inputs. The flaw exists in the device's web server implementation where user-supplied parameters are not adequately sanitized before being rendered in web responses. When a user clicks on a maliciously crafted link containing XSS payloads, the device fails to properly escape or filter the input data, allowing attackers to inject malicious scripts into the web interface. This vulnerability falls under CWE-79 which categorizes cross-site scripting flaws as weaknesses in web applications that fail to properly validate or escape user inputs. The attack vector is particularly concerning as it leverages social engineering techniques where users might be tricked into clicking malicious links that appear legitimate.
The technical exploitation of this vulnerability requires an attacker to craft a malicious URL containing XSS payload that targets the Digi Page functionality. The vulnerability is classified as a reflected XSS attack since the malicious script is reflected off the web server in response to user input. The device's web interface does not implement proper output encoding or content security policies to prevent script execution. This allows attackers to execute arbitrary JavaScript code in the context of a victim's browser session, potentially enabling session hijacking, credential theft, or redirection to malicious sites. The attack typically involves constructing a URL with malicious parameters that when processed by the device's web server, get embedded directly into the HTML response without proper sanitization. The vulnerability is particularly dangerous because it operates at the application layer and can be exploited without requiring authentication or physical access to the device.
The operational impact of this vulnerability extends beyond simple script execution as it compromises the integrity of the device's web interface and potentially the entire network infrastructure it manages. An attacker could use this vulnerability to establish persistent access to the device by stealing session cookies or injecting malicious scripts that maintain access even after initial exploitation. The Digi AnywhereUSB 14 serves as a network access point for remote devices, making this vulnerability a potential gateway for broader network compromise. When combined with other attack techniques, this XSS vulnerability could enable an attacker to escalate privileges or gain unauthorized access to connected devices. The vulnerability also impacts the device's ability to maintain secure communications as the web interface becomes a potential attack surface for man-in-the-middle scenarios. The attack could be executed through various means including email phishing, malicious websites, or compromised third-party services that might redirect users to malicious links.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and output encoding mechanisms within the device's web server. The most effective immediate solution involves applying input sanitization filters that remove or escape potentially dangerous characters from user-supplied data before processing. Implementing a content security policy that restricts script execution and prevents inline JavaScript from being executed would significantly reduce the risk. Network segmentation and access control measures should be implemented to limit the potential impact of successful exploitation attempts. Regular security updates and patches should be deployed to address this vulnerability and prevent attackers from leveraging known exploits. Organizations should also implement web application firewalls that can detect and block suspicious requests containing XSS payloads. The implementation of secure coding practices and regular security testing should be enforced to prevent similar vulnerabilities from being introduced in future versions of the device software. Additionally, user education regarding the risks of clicking suspicious links and the importance of verifying URL authenticity can help reduce the success rate of social engineering attacks targeting this vulnerability. This approach aligns with the ATT&CK framework's tactics for initial access and persistence, emphasizing the need for both technical controls and user awareness training to address such web application vulnerabilities effectively.