CVE-2018-6893 in FineCMS
Summary
by MITRE
controllers/member/Api.php in dayrui FineCms 5.2.0 has SQL Injection: a request with s=member,c=api,m=checktitle, and the parameter 'module' with a SQL statement, lacks effective filtering.
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Analysis
by VulDB Data Team • 01/04/2020
The vulnerability identified as CVE-2018-6893 resides within the dayrui FineCms content management system version 5.2.0, specifically in the member controller's API component. This flaw represents a classic SQL injection vulnerability that allows authenticated attackers with member privileges to execute arbitrary SQL commands against the underlying database. The vulnerability manifests when processing requests with specific parameters including s=member, c=api, and m=checktitle, where the module parameter is susceptible to SQL injection attacks without proper input validation or sanitization.
The technical implementation of this vulnerability stems from inadequate parameter filtering within the Api.php controller file. When the system processes the module parameter through the checktitle method, it directly incorporates user-supplied input into SQL query construction without proper sanitization or parameter binding mechanisms. This design flaw aligns with CWE-89, which categorizes SQL injection as a critical weakness in software systems where untrusted data is concatenated into SQL commands without adequate protection measures. The vulnerability specifically targets the SQL query execution flow that validates title uniqueness in the member module, creating an attack surface where malicious SQL payloads can be injected and executed with the privileges of the database user.
The operational impact of this vulnerability extends beyond simple data theft, as it provides attackers with the capability to perform comprehensive database enumeration, data modification, and potential privilege escalation. An attacker with member-level access can exploit this vulnerability to extract sensitive user information, modify database records, or even gain access to administrative functions. The attack requires minimal privileges since the vulnerability is accessible through the member API endpoint, making it particularly dangerous in environments where member accounts are commonly created or where social engineering attacks might compromise user credentials. This vulnerability also aligns with ATT&CK technique T1071.005, which covers application layer protocol usage for command and control, as the SQL injection can be used to establish persistent access or exfiltrate data through database queries.
Mitigation strategies for CVE-2018-6893 should focus on implementing proper input validation and parameterized queries throughout the FineCms codebase. The most effective immediate solution involves updating to a patched version of dayrui FineCms that properly sanitizes user input before incorporating it into SQL queries. Organizations should implement proper parameter binding or prepared statements to ensure that user-supplied data cannot be interpreted as SQL commands. Additionally, input validation should be enforced at multiple layers including application-level filtering and database-level access controls. Security measures should include regular code reviews to identify similar patterns in other controller files, implementation of web application firewalls to detect and block suspicious SQL injection patterns, and comprehensive monitoring of database access logs for anomalous query patterns. The vulnerability demonstrates the critical importance of following secure coding practices and implementing defense-in-depth strategies to protect against common injection vulnerabilities that can compromise entire database systems.