CVE-2022-1683 in amtyThumb Plugin
Summary
by MITRE • 06/08/2022
The amtyThumb WordPress plugin through 4.2.0 does not sanitise and escape a parameter before using it in a SQL statement via its shortcode, leading to an SQL injection and is exploitable by any authenticated user (and not just Author+ like the original advisory mention) due to the fact that they can execute shortcodes via an AJAX action
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Analysis
by VulDB Data Team • 06/10/2022
The CVE-2022-1683 vulnerability resides within the amtyThumb WordPress plugin version 4.2.0 and earlier, representing a critical SQL injection flaw that undermines database security. This vulnerability manifests through the plugin's shortcode functionality, where user-supplied parameters are inadequately sanitized and escaped before being incorporated into SQL queries. The flaw allows attackers to manipulate database operations through crafted input, potentially enabling unauthorized data access, modification, or deletion. The vulnerability's exploitation scope extends beyond the originally reported privilege levels, as authenticated users can leverage AJAX actions to execute shortcodes, thereby bypassing the typical author-level restrictions.
The technical implementation of this vulnerability follows a classic SQL injection pattern where the plugin fails to properly validate input parameters before their integration into database queries. The amtyThumb plugin's shortcode handler processes user-provided data without adequate sanitization measures, creating an entry point for malicious SQL commands. This weakness directly maps to CWE-89, which categorizes improper neutralization of special elements in SQL commands, and aligns with ATT&CK technique T1071.004 for application layer protocol manipulation. The vulnerability's exploitation requires minimal privileges since any authenticated user can trigger the affected shortcode functionality through AJAX endpoints, making it particularly dangerous in multi-user environments where users may have varying permission levels.
The operational impact of CVE-2022-1683 extends significantly beyond simple data theft, as successful exploitation can lead to complete database compromise and potential lateral movement within affected systems. Attackers can leverage this vulnerability to extract sensitive information including user credentials, personal data, and system configurations. The vulnerability's accessibility through AJAX actions means that even users with basic account privileges can potentially cause significant damage, making it a prime target for privilege escalation attacks. Additionally, the SQL injection could enable attackers to modify or delete database records, potentially corrupting the WordPress installation and affecting website availability. The vulnerability's persistence in the plugin's core functionality makes it particularly challenging to remediate without immediate patching or mitigation.
Mitigation strategies for CVE-2022-1683 should prioritize immediate plugin updates to versions that address the sanitization issues, as this represents the most effective long-term solution. Organizations should implement strict input validation and parameterized queries within the plugin's shortcode handlers to prevent similar vulnerabilities from emerging. Network-based protections such as web application firewalls can provide temporary defense while patches are deployed, though these solutions may not be foolproof against sophisticated attacks. Regular security audits should verify that all WordPress plugins follow proper input sanitization practices, and administrators should enforce principle of least privilege to minimize the impact of potential exploitation. The vulnerability highlights the critical importance of proper data validation and the need for security-conscious development practices, particularly when handling user-supplied input in database operations. Organizations should also consider implementing database activity monitoring to detect potential exploitation attempts and establish incident response procedures specifically addressing SQL injection vulnerabilities.