Cross-site request forgery (CSRF) vulnerability in the twimp-wp plugin for WordPress allows remote attackers to hijack the authentication of administrators for requests that conduct cross-site scripting (XSS) attacks via the message_format parameter in the twimp-wp.php page to wp-admin/options-general.php.
Attackers can exploit a cross-site request forgery (CSRF) vulnerability in the twimp-wp WordPress plugin to hijack administrator accounts and inject malicious cross-site scripting (XSS) payloads. This allows for complete site compromise, including data theft, defacement, and potential server control. The vulnerability leverages the message_format parameter to execute arbitrary code within the context of an authenticated administrator's session.
Step 1: Craft Malicious Payload: The attacker crafts a malicious JavaScript payload designed to exploit the XSS vulnerability. This payload could be designed to steal cookies, redirect users, or perform other malicious actions.
Step 2: CSRF Attack Vector: The attacker creates a malicious link or embeds the malicious code within a webpage, email, or other medium. This link contains a crafted URL that, when accessed by an administrator, will trigger the vulnerability.
Step 3: Administrator Interaction: An authenticated WordPress administrator visits the attacker's crafted link or webpage. This action triggers the malicious request.
Step 4: Request Execution: Because the plugin lacks CSRF protection, the administrator's browser sends the crafted request to wp-admin/options-general.php with the malicious message_format parameter.
Step 5: XSS Injection: The plugin processes the request and saves the malicious JavaScript payload within its settings. This payload is then executed whenever the plugin's settings are displayed or when the plugin's functionality is used.
Step 6: Payload Execution: When the plugin's settings are accessed or its functionality is used, the injected JavaScript payload executes within the administrator's browser, allowing the attacker to perform actions on behalf of the administrator.
The vulnerability stems from a combination of a CSRF flaw and improper input validation within the twimp-wp plugin. The plugin fails to adequately validate the message_format parameter when processing requests to wp-admin/options-general.php. This allows an attacker to craft a malicious request that, when executed by an authenticated administrator (e.g., through a social engineering attack), injects arbitrary JavaScript code into the plugin's settings. The lack of CSRF protection allows an attacker to trick a logged-in administrator into making a request that modifies the plugin's configuration, leading to XSS. The root cause is the absence of a CSRF token check and insufficient input sanitization of the message_format parameter, enabling the injection of malicious JavaScript.