CVE-2022-29441 in Private Messages Plugin
Summary
by MITRE • 06/15/2022
Cross-Site Request Forgery (CSRF) vulnerability in Private Messages For WordPress plugin <= 2.1.10 at WordPress allows attackers to send messages.
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Analysis
by VulDB Data Team • 06/16/2022
The CVE-2022-29441 vulnerability represents a critical cross-site request forgery flaw discovered in the Private Messages For WordPress plugin version 2.1.10 and earlier. This vulnerability resides within the WordPress ecosystem and specifically targets the private messaging functionality of the plugin. The issue allows unauthenticated attackers to manipulate the plugin's message sending capabilities through crafted requests, potentially enabling them to send unauthorized messages on behalf of legitimate users. The vulnerability stems from the plugin's failure to implement proper CSRF protection mechanisms, leaving the message submission endpoints vulnerable to exploitation.
The technical implementation of this CSRF vulnerability occurs at the plugin's message handling endpoints where user input is processed without adequate validation of the request origin or authenticity. Attackers can craft malicious requests that appear to originate from legitimate users, exploiting the absence of anti-CSRF tokens or similar protective measures. This flaw falls under the CWE-352 category, which specifically addresses Cross-Site Request Forgery vulnerabilities, and aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments or links. The vulnerability is particularly concerning because it directly impacts the integrity of user communications within the WordPress platform, potentially allowing attackers to send spam messages, phishing attempts, or malicious content to other users.
The operational impact of this vulnerability extends beyond simple message manipulation, as it can serve as a vector for more sophisticated attacks within the WordPress environment. An attacker could leverage this vulnerability to establish persistent communication channels with compromised users, potentially using the private messaging system as a covert command and control mechanism. The vulnerability affects all WordPress installations using the affected plugin version, creating widespread exposure across numerous websites and potentially enabling large-scale spam campaigns or social engineering attacks. Organizations using this plugin without proper patching or mitigation measures face significant risk of unauthorized message propagation and potential user trust compromise.
Mitigation strategies for CVE-2022-29441 should prioritize immediate plugin updates to version 2.1.11 or later, which contains the necessary CSRF protection patches. Administrators should also implement additional security measures such as monitoring for unusual message patterns, restricting message sending capabilities to verified users only, and deploying web application firewalls to detect and block suspicious requests. The vulnerability demonstrates the importance of proper input validation and authentication mechanisms, particularly for plugins that handle sensitive user communications. Organizations should conduct comprehensive security audits of their WordPress installations to identify other potential CSRF vulnerabilities, as this flaw highlights the critical need for robust anti-CSRF protections in web applications. Security teams should also consider implementing rate limiting for message sending functions and establishing proper logging mechanisms to detect unauthorized message activity. The incident underscores the necessity of regular security updates and the implementation of defense-in-depth strategies to protect against such exploitation vectors.