CVE-2022-3357 in Smart Slider 3 Plugin
Summary
by MITRE • 10/31/2022
The Smart Slider 3 WordPress plugin before 3.5.1.11 unserialises the content of an imported file, which could lead to PHP object injection issues when a user import (intentionally or not) a malicious file, and a suitable gadget chain is present on the site.
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Analysis
by VulDB Data Team • 05/07/2025
The Smart Slider 3 WordPress plugin vulnerability identified as CVE-2022-3357 represents a critical security flaw that exposes WordPress installations to remote code execution through improper input validation and unsafe deserialization practices. This vulnerability specifically affects versions prior to 3.5.1.11 and stems from the plugin's failure to properly sanitize imported data during the import process. When users import slider configurations or other content through the plugin's import functionality, the system attempts to unserialize data without adequate security controls, creating an avenue for malicious actors to inject PHP objects that can be executed within the target environment. The vulnerability operates under the principle that when a user imports a maliciously crafted file, the plugin's unserialization process can trigger arbitrary code execution if suitable gadget chains exist within the target system. This flaw directly relates to CWE-502 which classifies unsafe deserialization as a significant security risk, particularly when object instantiation occurs without proper validation of the serialized data structure. The attack vector is particularly concerning because it can be triggered through social engineering or by exploiting the plugin's legitimate import functionality, making it difficult to distinguish between legitimate and malicious imports.
The technical exploitation of this vulnerability requires that an attacker first crafts a malicious serialized PHP object containing a gadget chain that can be executed within the context of the WordPress installation. This process typically involves identifying classes and methods within the target system that can be leveraged to perform malicious operations such as file manipulation, command execution, or data exfiltration. The vulnerability's impact is amplified by the fact that many WordPress installations run with sufficient privileges to allow the execution of dangerous operations through the imported objects. The attack surface extends beyond the immediate plugin functionality because the deserialization process can interact with various system components, potentially allowing an attacker to escalate privileges or gain persistent access to the compromised system. The vulnerability's classification under the ATT&CK framework would include techniques such as T1566 for social engineering to induce the import of malicious files and T1059 for command and scripting interpreter usage, as the executed code can leverage various system interfaces.
The operational impact of CVE-2022-3357 extends far beyond simple data compromise, as successful exploitation can result in complete system takeover and persistent backdoor installation. WordPress administrators who import slider configurations from untrusted sources or who are tricked into importing malicious files face the risk of unauthorized access to their entire website infrastructure, potentially including databases, user accounts, and server resources. The vulnerability's exploitation can lead to website defacement, data theft, and the use of compromised systems for further attacks against other targets. Organizations that rely on WordPress for their digital presence face significant business risks including reputation damage, regulatory compliance violations, and potential legal consequences. The vulnerability's persistence is particularly concerning as attackers can establish backdoors that survive system reboots and continue to operate undetected, making it difficult to maintain long-term security posture. Additionally, the impact extends to the broader WordPress ecosystem since the vulnerability can be leveraged to attack other plugins or themes that might share similar deserialization patterns, creating a cascading effect across multiple systems.
Mitigation strategies for CVE-2022-3357 must address both immediate remediation and long-term security improvements. The primary recommendation involves upgrading to Smart Slider 3 plugin version 3.5.1.11 or later, which includes proper input validation and secure deserialization practices. Administrators should implement strict file import controls, including verification of file integrity and source authentication before allowing any import operations. The implementation of web application firewalls and security monitoring systems can help detect suspicious import activities and prevent exploitation attempts. Security hardening measures such as disabling unnecessary import functionality, restricting file upload permissions, and implementing proper access controls should be enforced. Regular security audits of installed plugins and themes are essential to identify similar vulnerabilities that may exist in other components of the WordPress ecosystem. Organizations should also consider implementing automated patch management processes to ensure timely updates of all WordPress components and maintain comprehensive backup strategies to facilitate recovery in case of successful exploitation attempts. The vulnerability highlights the importance of following secure coding practices and the principle of least privilege when handling user-supplied data in web applications.