CVE-2016-20027

Vulnerability

Overview

ZKTeco ZKBioSecurity 3.0 contains multiple reflected cross-site scripting (XSS) vulnerabilities. The root cause is improper sanitization of user-supplied input passed through several parameters passed to multiple scripts, such as filter:authGroupSet.id in the /authRoleAction!getAll.action endpoint. This allows attackers to inject arbitrary HTML and JavaScript code that is reflected back to the user's browser [1][2].

Exploitation

An attacker can exploit these vulnerabilities by crafting a malicious URL containing an XSS payload in a vulnerable parameter and tricking a user into clicking it. No authentication is required to trigger the reflection, but the attack requires user interaction (e.g., clicking a link). The vulnerability is present in ZKBioSecurity version 3.3.0.1.0_R_230 and earlier versions [2][3].

Impact

Successful exploitation enables an attacker to execute arbitrary script code in the context of the affected application within the victim's browser session. This could lead to session hijacking, defacement, or theft of sensitive information displayed in the application [1][2].

Mitigation

As of the advisory publication date (July 2016), no vendor patch was available. Users should apply input validation and output encoding as a workaround, or upgrade to a patched version if one becomes available. The vulnerability is publicly documented and has been assigned CVE-2016-20027 [2][3].