CVE-2024-25927: Jmash Postmash SQL Injection Vulnerability

CVE-2024-25927 Overview

CVE-2024-25927 is a SQL Injection vulnerability affecting the postMash – custom post order WordPress plugin developed by Joel Starnes. This vulnerability allows attackers to manipulate SQL queries through improper neutralization of special elements, potentially leading to unauthorized database access, data exfiltration, and complete site compromise.

Critical Impact

This SQL Injection vulnerability enables unauthenticated attackers to execute arbitrary SQL commands against the WordPress database, potentially exposing sensitive user data, credentials, and allowing full database manipulation.

Affected Products

• postMash – custom post order plugin versions from n/a through 1.2.0
• WordPress installations using the vulnerable postMash plugin
• jmash postmash (cpe:2.3:a:jmash:postmash::::::wordpress::*)

Discovery Timeline

• 2024-02-28 - CVE-2024-25927 published to NVD
• 2025-03-04 - Last updated in NVD database

Technical Details for CVE-2024-25927

Vulnerability Analysis

This vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). The postMash plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries executed against the WordPress database. This oversight allows attackers to inject malicious SQL code that gets executed with the same privileges as the database user configured for WordPress.

The network-accessible attack vector means exploitation can occur remotely without requiring any user interaction or authentication. Successful exploitation could result in complete compromise of the WordPress database, including access to user credentials, post content, configuration data, and potentially administrative access to the WordPress installation.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and lack of parameterized queries within the postMash plugin's codebase. When processing user input related to custom post ordering functionality, the plugin constructs SQL queries by directly concatenating user-controlled data without proper escaping or prepared statements. This fundamental coding flaw allows specially crafted input to break out of the intended query context and execute arbitrary SQL commands.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity. An attacker can craft malicious HTTP requests containing SQL injection payloads targeting the vulnerable parameters in the postMash plugin. Since no privileges or user interaction are required, this vulnerability can be exploited by any remote attacker who can reach the WordPress installation.

The attack flow typically involves identifying endpoints that interact with the postMash plugin's post ordering functionality, then injecting SQL payloads through vulnerable parameters. Successful injection can be leveraged for data extraction using UNION-based or blind SQL injection techniques, or for modifying database contents.

For detailed technical information about the exploitation mechanism, refer to the Patchstack Security Advisory.

Detection Methods for CVE-2024-25927

Indicators of Compromise

• Unusual or malformed HTTP requests targeting postMash plugin endpoints containing SQL syntax characters such as single quotes, double dashes, or UNION keywords
• Database error messages appearing in web server logs indicating SQL syntax errors
• Unexpected database queries in MySQL slow query logs or general query logs originating from WordPress
• Evidence of data exfiltration or unauthorized database modifications in WordPress tables

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in requests to WordPress plugin endpoints
• Monitor web server access logs for requests containing encoded SQL injection payloads targeting the postMash plugin paths
• Implement database activity monitoring to detect anomalous query patterns such as UNION SELECT statements or excessive data extraction
• Use WordPress security plugins that scan for known vulnerable plugin versions

Monitoring Recommendations

• Enable detailed logging on the WordPress installation and web server to capture full request parameters
• Configure alerts for database errors that may indicate failed injection attempts
• Establish baseline database query patterns to identify anomalous SQL activity
• Monitor for changes to WordPress user tables or option tables that could indicate successful exploitation

How to Mitigate CVE-2024-25927

Immediate Actions Required

• Immediately disable or uninstall the postMash – custom post order plugin if running version 1.2.0 or earlier
• Audit WordPress database for signs of unauthorized access or data modification
• Review web server logs for evidence of exploitation attempts
• Change all WordPress user passwords and database credentials if compromise is suspected

Patch Information

Organizations should check for an updated version of the postMash plugin that addresses this SQL injection vulnerability. If no patched version is available, consider using alternative plugins that provide similar post ordering functionality with proper security controls. Monitor the Patchstack vulnerability database for updates regarding fixes.

Workarounds

• Remove or deactivate the postMash plugin entirely until a security patch is available
• Implement WAF rules to block requests containing SQL injection patterns to WordPress plugin endpoints
• Restrict access to WordPress admin and plugin functionality to trusted IP addresses only
• Apply the principle of least privilege to the WordPress database user account to limit potential damage from SQL injection

# Disable postMash plugin via WP-CLI
wp plugin deactivate postmash

# Or remove the plugin entirely
wp plugin uninstall postmash

# Verify plugin status
wp plugin list --status=active