CVE-2022-1338 in Easily Generate Rest API Url Plugin
Summary
by MITRE • 05/09/2022
The Easily Generate Rest API Url WordPress plugin through 1.0.0 does not escape some of its settings, allowing high privilege users such as admin to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed
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Analysis
by VulDB Data Team • 05/12/2022
The CVE-2022-1338 vulnerability affects the Easily Generate Rest API Url WordPress plugin version 1.0.0 and earlier, representing a critical cross-site scripting flaw that undermines the security model of WordPress installations. This vulnerability specifically targets the plugin's handling of user settings and configuration data, creating a pathway for malicious actors to inject malicious scripts into the WordPress admin interface. The flaw exists because the plugin fails to properly sanitize and escape output when rendering its settings pages, allowing attackers with administrative privileges to execute XSS payloads within the context of the admin session. The vulnerability is particularly concerning because it operates even when the unfiltered_html capability has been restricted, which is a standard security practice that prevents unauthorized users from injecting raw HTML content into WordPress posts and pages.
The technical implementation of this vulnerability stems from the plugin's inadequate input validation and output escaping mechanisms within its administrative interfaces. When administrators access the plugin's settings page, the plugin renders configuration values without proper HTML escaping, creating an XSS vector that can be exploited by attackers who have already gained administrative access to the WordPress installation. The vulnerability is classified under CWE-79 as a Cross-Site Scripting flaw, specifically manifesting as a reflected XSS attack that occurs when the plugin's settings are displayed in the browser. This type of vulnerability allows attackers to execute scripts in the context of the victim's browser session, potentially enabling them to steal session cookies, modify content, or perform actions on behalf of the administrator. The attack vector operates through the WordPress admin interface where the plugin's settings are rendered, making it particularly dangerous for high-privilege users who can leverage this vulnerability to escalate their access within the WordPress environment.
The operational impact of CVE-2022-1338 extends beyond simple script execution, as it can be leveraged to compromise entire WordPress installations through persistent XSS attacks. Attackers can craft malicious payloads that remain stored within the plugin's configuration settings, causing the XSS to persist across multiple page loads and user sessions. This persistent nature means that any administrator who accesses the affected plugin's settings page will be vulnerable to the stored XSS attack, potentially allowing attackers to maintain long-term access to the WordPress administrative interface. The vulnerability can be exploited to steal administrator session cookies, which would enable attackers to impersonate the administrator and gain full control over the WordPress installation. Additionally, the XSS can be used to modify plugin settings, inject malicious code into the WordPress admin interface, or redirect administrators to malicious sites, making this vulnerability particularly dangerous for WordPress sites that rely on the plugin for REST API functionality. The attack can be executed through the standard WordPress admin interface, making it difficult to detect and mitigate without proper input sanitization.
Mitigation strategies for CVE-2022-1338 require immediate action from WordPress administrators and security teams to address the XSS vulnerability within the affected plugin. The primary recommendation is to upgrade to the latest version of the Easily Generate Rest API Url plugin where the vulnerability has been patched and proper output escaping has been implemented. Administrators should also implement additional security measures such as restricting access to the WordPress admin interface through IP whitelisting, implementing multi-factor authentication, and monitoring for suspicious activities within the admin interface. The vulnerability highlights the importance of proper input validation and output escaping practices, which align with the OWASP Top Ten security principles and the ATT&CK framework's mitigation strategies for web application vulnerabilities. Organizations should also consider implementing Content Security Policy (CSP) headers to limit the execution of unauthorized scripts within the WordPress admin environment. Regular security audits and vulnerability assessments should be conducted to identify similar issues in other plugins and themes, as this vulnerability demonstrates the critical need for proper sanitization of user-provided data within WordPress administrative interfaces. The security community should also be aware that this vulnerability may be exploited in combination with other WordPress vulnerabilities to create more sophisticated attack vectors that could compromise entire WordPress installations.