CVE-2022-0874 in WP Social Buttons Plugin
Summary
by MITRE • 05/09/2022
The WP Social Buttons WordPress plugin through 2.1 does not sanitise and escape 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 WP Social Buttons WordPress plugin version 2.1 and earlier contains a critical cross-site scripting vulnerability that undermines the security model of WordPress installations. This vulnerability specifically affects the plugin's handling of user settings and configuration parameters, creating a persistent security flaw that can be exploited by users with administrative privileges or higher. The issue stems from the plugin's failure to properly sanitize and escape user input within its settings interface, allowing malicious code to be injected and subsequently executed in the context of other users' browsers. The vulnerability is particularly concerning because it can be exploited even when the WordPress installation has restricted the unfiltered_html capability, which is a standard security measure designed to prevent XSS attacks by limiting raw HTML input to privileged users only. This failure to implement proper input validation and output escaping creates a vector for attackers to bypass WordPress's built-in security controls.
The technical flaw manifests in the plugin's settings handling mechanism where configuration values are stored without adequate sanitization before being rendered back to users or processed within the application's interface. When administrators configure social button settings or modify plugin parameters, the raw input data is not properly escaped or validated, creating opportunities for malicious payloads to be stored and subsequently executed. This vulnerability operates under CWE-79 which specifically addresses cross-site scripting flaws, and it aligns with ATT&CK technique T1566.001 which covers spearphishing through social media. The flaw represents a classic case of insufficient output escaping where data flows from user input through the application's processing layers without proper encoding or validation, allowing script code to persist in the application's data store and execute when rendered to other users.
The operational impact of this vulnerability extends beyond simple XSS exploitation, as it provides attackers with the ability to escalate privileges and perform actions that would normally be restricted to legitimate administrators. An attacker with administrative access can inject malicious scripts that can steal session cookies, redirect users to malicious sites, or even modify plugin functionality to create backdoors within the WordPress installation. The vulnerability is particularly dangerous in multi-user environments where administrators might be tricked into visiting compromised pages or where attackers can leverage the stored XSS to maintain persistence within the application. The attack surface is broad as the malicious scripts can execute in the context of any user who accesses the plugin settings or views pages where the malicious code is rendered, potentially affecting all users with access to the compromised WordPress installation. This makes the vulnerability especially dangerous in enterprise environments where WordPress is used for content management and where administrators might not be fully aware of the security implications of the plugin's configuration interface.
Organizations should immediately update to the latest version of the WP Social Buttons plugin where this vulnerability has been patched, as the fix typically involves implementing proper input sanitization and output escaping mechanisms. System administrators should also conduct thorough security audits of their WordPress installations to identify any other plugins that might be vulnerable to similar issues, as the presence of one vulnerable plugin often indicates broader security gaps in the overall WordPress ecosystem. The mitigation strategy should include implementing proper input validation at multiple layers, ensuring that all user-supplied data is properly escaped before being stored or rendered, and regularly monitoring plugin repositories for security updates. Additionally, organizations should consider implementing web application firewalls and content security policies to provide additional layers of protection against XSS attacks. The vulnerability demonstrates the critical importance of proper security practices in WordPress plugin development, particularly around input sanitization and output escaping, as these are fundamental requirements for maintaining application security in web environments.