Attack Chain

1. An unauthenticated attacker identifies a Yot CMS 3.3.1 instance.
2. The attacker crafts a malicious SQL payload designed to extract database information. This payload is injected into either the aid or cid parameter of a GET request.
3. The attacker sends the crafted GET request to the index.php endpoint of the vulnerable Yot CMS instance. For example: index.php?aid=malicious_sql_payload or index.php?cid=malicious_sql_payload.
4. The Yot CMS application processes the GET request without properly sanitizing the aid or cid parameter.
5. The malicious SQL payload is passed directly to the database server.
6. The database server executes the injected SQL query.
7. The database server returns the results of the injected SQL query to the Yot CMS application.
8. The Yot CMS application displays the extracted database information, potentially revealing sensitive data like table names, column names, and data contained within the tables.

Impact

Successful exploitation of this SQL injection vulnerability (CVE-2018-25425) allows unauthenticated attackers to execute arbitrary SQL queries on the Yot CMS 3.3.1 database. This can lead to the disclosure of sensitive information, such as usernames, passwords, and other confidential data stored in the database. The attacker could potentially gain complete control over the database, leading to data modification, deletion, or the insertion of malicious content into the CMS.

Recommendation

• Apply appropriate input validation and sanitization techniques to all user-supplied input, especially within the aid and cid parameters of index.php, to prevent SQL injection attacks as described in CVE-2018-25425.
• Deploy the Sigma rule “Detect Yot CMS SQL Injection Attempt via GET Parameters” to detect exploitation attempts in web server logs.
• Monitor web server logs for suspicious GET requests to index.php containing SQL keywords or special characters in the aid or cid parameters.