CVE-2022-0633 in UpdraftPlus Plugin
Summary
by MITRE • 02/17/2022
The UpdraftPlus WordPress plugin Free before 1.22.3 and Premium before 2.22.3 do not properly validate a user has the required privileges to access a backup's nonce identifier, which may allow any users with an account on the site (such as subscriber) to download the most recent site & database backup.
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Analysis
by VulDB Data Team • 02/19/2022
The CVE-2022-0633 vulnerability affects the UpdraftPlus WordPress plugin, specifically targeting both the free and premium versions prior to their respective 1.22.3 and 2.22.3 releases. This security flaw represents a critical authorization bypass issue that undermines the plugin's access control mechanisms. The vulnerability stems from insufficient validation of user privileges when accessing backup nonce identifiers, creating a path for unauthorized users to exploit the system's backup functionality. The affected plugin is widely used for WordPress site backup and restoration operations, making this vulnerability particularly concerning for website administrators and security professionals. The flaw exists within the plugin's core authorization logic, where it fails to properly verify that users possess the necessary administrative privileges before granting access to backup operations. This type of vulnerability falls under the CWE-285 category, which encompasses improper authorization issues in software systems.
The technical implementation of this vulnerability allows any authenticated user account on the WordPress site to potentially access backup files without proper authorization. Attackers with subscriber-level accounts or lower can exploit this weakness to download the most recent site and database backups, which typically contain sensitive information including user credentials, database schemas, and potentially proprietary content. The nonce identifier validation mechanism, which should serve as a security token to verify user authorization, is bypassed due to inadequate privilege checks. This weakness creates a direct path for privilege escalation and information disclosure attacks, as the backup files often contain comprehensive site data that could be leveraged for further attacks. The vulnerability operates at the application layer and specifically targets the plugin's API endpoints that handle backup access requests, making it particularly dangerous for sites with multiple user roles and varying permission levels.
The operational impact of this vulnerability extends beyond simple data exposure, as backup files often contain sensitive information that could be used for advanced persistent threat campaigns. Attackers could potentially use the downloaded backup files to reconstruct site configurations, identify vulnerabilities in other systems, or extract user credentials that might be reused across different platforms. The exposure of database backups particularly increases the risk of credential theft, as these files often contain hashed passwords, session tokens, and other authentication-related data. Organizations running WordPress sites with the vulnerable UpdraftPlus plugin face significant risk of data breaches, regulatory compliance violations, and potential legal consequences. The vulnerability also undermines the security posture of entire WordPress installations, as backup files typically represent the most comprehensive view of a site's data and configuration that attackers can obtain. This weakness demonstrates poor security design principles and highlights the importance of proper access control implementation in web applications.
Mitigation strategies for CVE-2022-0633 primarily involve immediate plugin updates to versions 1.22.3 or later for the free version and 2.22.3 or later for the premium version. System administrators should also implement additional security measures including monitoring for unauthorized backup access attempts, reviewing user roles and permissions regularly, and ensuring that backup files are stored securely with appropriate access controls. The vulnerability aligns with ATT&CK technique T1213.002, which involves data from information repositories, and represents a clear example of insufficient authorization controls in web applications. Organizations should conduct comprehensive security assessments of their WordPress installations, verify that all plugins are updated to secure versions, and implement network segmentation to limit access to backup files. Security teams should also consider implementing automated monitoring solutions that can detect unusual backup access patterns and alert administrators to potential exploitation attempts. Regular security audits of WordPress plugins and themes remain essential for maintaining robust security postures against such authorization bypass vulnerabilities.