CVE-2019-9978 in social-warfare Plugin
Summary
by MITRE
The social-warfare plugin before 3.5.3 for WordPress has stored XSS via the wp-admin/admin-post.php?swp_debug=load_options swp_url parameter, as exploited in the wild in March 2019. This affects Social Warfare and Social Warfare Pro.
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Analysis
by VulDB Data Team • 09/09/2024
The vulnerability identified as CVE-2019-9978 represents a critical stored cross-site scripting flaw within the Social Warfare WordPress plugin ecosystem. This vulnerability specifically impacts versions prior to 3.5.3 and affects both the standard Social Warfare plugin and its premium variant Social Warfare Pro. The flaw exists within the plugin's administrative interface, specifically in the wp-admin/admin-post.php endpoint where the swp_debug parameter is processed with the load_options action. The exploitation technique leverages a maliciously crafted swp_url parameter that gets stored in the WordPress database and subsequently executed when the affected page is accessed by authenticated users.
The technical nature of this vulnerability stems from inadequate input validation and output sanitization within the plugin's debug functionality. When an administrator or privileged user accesses the maliciously crafted URL containing the swp_url parameter, the plugin fails to properly escape or validate the input before storing it in the database. This stored data then gets rendered in subsequent administrative pages without proper sanitization, creating a persistent XSS vector that can be triggered whenever the affected administrative interface is accessed. The vulnerability operates at the application layer and requires administrative privileges to exploit, though the impact extends beyond the immediate user session due to the stored nature of the payload.
The operational impact of this vulnerability is significant as it provides attackers with the ability to execute arbitrary JavaScript code within the context of an administrator's browser session. This could enable attackers to perform actions such as stealing session cookies, modifying plugin settings, accessing sensitive data, or even gaining full administrative control of the WordPress site. The vulnerability was actively exploited in the wild during March 2019, indicating that threat actors recognized its potential for privilege escalation and persistent access. The stored nature of the vulnerability means that once exploited, the malicious payload remains active until manually removed from the database, making it particularly dangerous for long-term compromise.
The vulnerability maps to CWE-79 which specifically addresses Cross-Site Scripting flaws in software applications. From an ATT&CK framework perspective, this vulnerability represents a privilege escalation technique that aligns with T1078 Valid Accounts and T1548.002 Account Manipulation, as the attacker requires administrative access to execute the payload but can then leverage the stored XSS for broader compromise. Additionally, the vulnerability demonstrates characteristics of T1213 Data from Information Repositories, as it allows for unauthorized access to administrative interfaces and potentially sensitive data stored within the WordPress environment. The exploitation requires minimal technical skill and can be automated, making it a preferred vector for automated attacks against WordPress installations. Organizations should implement immediate patching to version 3.5.3 or later, conduct thorough security audits of the affected plugin installations, and monitor for signs of compromise in their administrative interfaces.
The remediation strategy involves immediate deployment of the patched version 3.5.3 which addresses the input validation issues in the plugin's debug functionality. Security professionals should also implement monitoring for suspicious administrative activities and consider implementing additional security measures such as web application firewalls, input sanitization at the application level, and regular security scanning of WordPress installations. The vulnerability serves as a reminder of the importance of keeping third-party plugins updated and the critical need for proper input validation and output escaping in web applications to prevent XSS vulnerabilities from being exploited for privilege escalation and persistent access to administrative interfaces.