CVE-2017-18576 in event-notifier Plugin
Summary
by MITRE
The event-notifier plugin before 1.2.1 for WordPress has XSS via the loading animation.
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Analysis
by VulDB Data Team • 12/01/2023
The vulnerability identified as CVE-2017-18576 represents a cross-site scripting flaw within the event-notifier plugin for WordPress systems. This security weakness affects versions prior to 1.2.1 and specifically targets the plugin's handling of loading animation parameters. The issue arises from insufficient input validation and output sanitization mechanisms that fail to properly escape or filter user-controllable data before rendering it within the web interface. The vulnerability exists in the plugin's user interface components where loading animation elements are dynamically generated, creating an opportunity for malicious actors to inject malicious scripts into the affected WordPress environment.
The technical implementation of this vulnerability stems from improper handling of user-supplied parameters within the plugin's loading animation functionality. When the plugin processes animation settings or parameters, it fails to adequately sanitize these inputs before incorporating them into the HTML output. This creates a classic XSS attack vector where an attacker can craft malicious payloads that execute within the context of a victim's browser session. The vulnerability is particularly concerning because it operates within a WordPress plugin environment where administrators often have elevated privileges, potentially allowing attackers to execute malicious code with administrative rights. The flaw aligns with CWE-79 which categorizes cross-site scripting vulnerabilities as weaknesses in input validation and output encoding.
From an operational perspective, this vulnerability poses significant risks to WordPress installations using the affected event-notifier plugin. Attackers can exploit this weakness to inject malicious JavaScript code that can steal cookies, session tokens, or perform unauthorized administrative actions on behalf of legitimate users. The impact extends beyond simple data theft as the vulnerability could enable full compromise of the WordPress installation, particularly if administrators interact with the vulnerable plugin interface. The attack surface is broad since any user who can influence the loading animation parameters or access the plugin configuration interface could potentially exploit this vulnerability. This weakness can be leveraged to establish persistent access to the compromised WordPress site, making it a critical concern for organizations relying on WordPress for their web presence.
The remediation approach for CVE-2017-18576 requires immediate upgrading of the event-notifier plugin to version 1.2.1 or later, which contains the necessary patches to address the XSS vulnerability. Organizations should also implement comprehensive input validation measures and output encoding practices to prevent similar issues in other custom plugins or themes. Security monitoring should include regular scanning for outdated plugins and themes that may contain known vulnerabilities. The fix typically involves implementing proper sanitization of user inputs before rendering them in HTML contexts, utilizing WordPress's built-in escaping functions such as esc_attr and esc_html, and ensuring that all dynamic content is properly encoded. This vulnerability demonstrates the importance of maintaining up-to-date WordPress plugins and following secure coding practices, as highlighted in the ATT&CK framework's application of techniques related to credential access and privilege escalation through web application vulnerabilities. Organizations should also consider implementing web application firewalls and content security policies as additional defensive measures to mitigate the risk of similar XSS vulnerabilities in their WordPress environments.