CVE-2019-10677 in Zhone ZNID GPON 2426A EU
Summary
by MITRE
Multiple Cross-Site Scripting (XSS) issues in the web interface on DASAN Zhone ZNID GPON 2426A EU version S3.1.285 devices allow a remote attacker to execute arbitrary JavaScript via manipulation of an unsanitized GET parameter: /zhndnsdisplay.cmd (name), /wlsecrefresh.wl (wlWscCfgMethod, wl_wsc_reg).
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Analysis
by VulDB Data Team • 08/28/2024
The vulnerability CVE-2019-10677 represents a critical cross-site scripting flaw discovered in DASAN Zhone ZNID GPON 2426A EU version S3.1.285 devices, specifically affecting the web interface component of these telecommunications networking appliances. This vulnerability resides within the device's handling of unsanitized input parameters, creating a persistent security weakness that enables remote code execution through maliciously crafted web requests. The affected parameters include /zhndnsdisplay.cmd (name) and /wlsecrefresh.wl (wlWscCfgMethod, wl_wsc_reg) which are processed through GET requests without proper input validation or output encoding mechanisms.
The technical implementation of this vulnerability stems from inadequate input sanitization within the web application layer of the GPON device firmware. When the web interface processes these specific GET parameters, it fails to properly validate or escape user-supplied data before incorporating it into dynamic web content. This creates an environment where malicious JavaScript code can be injected and subsequently executed within the context of a victim's browser session. The vulnerability manifests as a classic reflected XSS attack vector, where the malicious payload is delivered via the URL parameters and executed when the victim's browser processes the response containing the unsanitized input.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform session hijacking, steal administrative credentials, and potentially gain full control over the device configuration. Attackers can craft malicious URLs that, when visited by an authenticated user, would execute arbitrary JavaScript code within the victim's browser context. This could enable unauthorized access to sensitive network configuration data, modification of device settings, or redirection to malicious websites. The remote nature of this attack vector means that exploitation does not require physical access to the device, making it particularly dangerous for network administrators who may unknowingly visit compromised links or have their devices targeted through phishing campaigns.
Security practitioners should implement immediate mitigations including network segmentation to limit access to administrative interfaces, deployment of web application firewalls to filter malicious requests, and mandatory input validation for all web parameters. The vulnerability aligns with CWE-79 which describes cross-site scripting flaws, and represents a significant risk under ATT&CK technique T1059.007 for command and scripting interpreter. Device administrators should also consider implementing strict access controls, regular firmware updates, and monitoring for suspicious network traffic patterns that might indicate exploitation attempts. The affected DASAN Zhone devices require immediate patching or network isolation until proper security controls can be implemented to prevent unauthorized access to the vulnerable web interface components.