CVE-2023-2333 in Ninja Forms Google Sheet Connector Plugin
Summary
by MITRE • 07/04/2023
The Ninja Forms Google Sheet Connector WordPress plugin before 1.2.7, gsheetconnector-ninja-forms-pro WordPress plugin through 1.2.7 does not escape a parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
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Analysis
by VulDB Data Team • 07/13/2023
The vulnerability identified as CVE-2023-2333 affects the Ninja Forms Google Sheet Connector WordPress plugin and its related gsheetconnector-ninja-forms-pro plugin versions prior to 1.2.7. This issue represents a critical security flaw that arises from improper input sanitization within the plugin's codebase, creating a reflected cross-site scripting vulnerability that poses significant risks to administrative users. The vulnerability occurs when the plugin fails to properly escape a parameter before incorporating it into an HTML attribute, thereby allowing malicious actors to inject harmful scripts into the plugin's output. The reflected nature of this XSS vulnerability means that an attacker can craft a malicious URL containing crafted script code that, when executed by an administrator's browser, will execute the injected payload in the context of the admin session.
The technical flaw stems from the plugin's handling of user-supplied parameters within its output generation logic. When a parameter is received from user input and subsequently included in an HTML attribute without proper sanitization or escaping, it creates an opening for attackers to inject malicious JavaScript code. This type of vulnerability is classified under CWE-79 as "Cross-site Scripting" and specifically represents a reflected XSS variant where the malicious script is reflected off the web server rather than being stored. The vulnerability's impact is amplified when considering that it can be exploited against high-privilege users such as administrators, whose sessions would provide full access to the WordPress installation and potentially compromise the entire web application environment. The attack typically requires social engineering to get an administrator to click on a maliciously crafted link that contains the XSS payload, which is then executed in their browser when they interact with the vulnerable plugin.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the potential to hijack administrator sessions, modify plugin configurations, access sensitive data, and ultimately gain full control over the WordPress installation. Attackers could leverage this vulnerability to perform actions such as creating new administrator accounts, modifying existing user permissions, accessing confidential form submissions, or even deploying malware through the compromised admin interface. The reflected nature of the vulnerability means that attackers do not need to store malicious payloads on the server, making detection more difficult and the attack more ephemeral. This vulnerability directly maps to several ATT&CK techniques including T1566.001 for initial access through spearphishing attachments and T1078 for valid accounts, as well as T1547.001 for persistence through registry modification if the attacker gains sufficient privileges. The attack vector typically involves crafting a malicious URL that includes JavaScript code designed to exploit the XSS vulnerability when accessed by an administrator, making it particularly dangerous in environments where administrators frequently interact with external links or email communications.
The recommended mitigation strategy involves immediately updating the affected plugins to version 1.2.7 or later, which contains the necessary patches to properly escape user-supplied parameters before outputting them in HTML attributes. Organizations should also implement additional security measures such as input validation, output encoding, and Content Security Policy (CSP) headers to provide defense-in-depth against similar vulnerabilities. Regular security audits and vulnerability assessments should be conducted to identify and remediate similar issues in other plugins and themes. Network monitoring should be enhanced to detect suspicious activities related to XSS attempts, and administrators should be trained to recognize potential phishing attempts that could exploit this vulnerability. The vulnerability demonstrates the critical importance of proper input sanitization and output escaping in web applications, particularly in administrative interfaces where elevated privileges can be leveraged to cause maximum damage. Organizations should also consider implementing web application firewalls to detect and block known XSS attack patterns, while maintaining up-to-date security patches across all WordPress installations to prevent similar vulnerabilities from being exploited.