WordPress External Login Plugin SQL Injection Vulnerability

A SQL injection vulnerability has been identified in the External Login plugin for WordPress, affecting all versions through 1.11.2. The issue arises from inadequate escaping of user-supplied data in the 'log' parameter, allowing unauthenticated attackers to inject additional SQL queries. This vulnerability is particularly concerning when PostgreSQL or MSSQL databases are used for external authentication, as it could lead to unauthorized access to sensitive database information.

Impact

Exploitation of this vulnerability allows for SQL injection, where attackers can manipulate SQL queries to extract sensitive information from the database.

Reproduction

To reproduce this vulnerability, send a request to the WordPress site with the 'log' parameter. The injected SQL code can be appended to the original SQL query handling the 'log' parameter, taking advantage of the insufficient escaping to manipulate the query execution. This can be done by crafting a payload that exploits the SQL query construction in the plugin's database authentication process.

Remediation

No known patch is available. It is recommended to uninstall the affected plugin and find a replacement.