Anyquery: Local File Read (LFR) via Unrestricted SQLite Virtual Table Modules in Server Mode

Summary

Anyquery's server mode lacks input sanitization and access control over its built-in SQLite virtual table modules (e.g., csv_reader, log_reader). Unauthenticated attackers connecting to the MySQL-compatible server port can create virtual tables pointing to local files on the system (e.g., /etc/passwd, ~/.ssh/id_rsa). This allows full Local File Read (LFR) capabilities, compromising sensitive system configurations and credentials.

Details

Anyquery utilizes the hashicorp/go-getter library within its data ingestion modules. When Anyquery is launched in Server Mode (anyquery server), it binds to a TCP port and accepts MySQL protocol connections. The server handler does not restrict the usage of these virtual table modules to safe directories. An attacker can connect to the server and execute native SQLite virtual table creation queries to instantiate modules like csv_reader pointing to restricted files. Because the file read operation is initiated by the Anyquery server process, the attacker can read any file the process has access to.

PoC (Proof of Concept)

1. Start the server on the victim machine:

   anyquery server --host 0.0.0.0 --port 8070
   

2. Connect from an attacker machine:

   mysql -u root -h <VICTIM_IP> -P 8070
   

3. Execute the following payload to read /etc/passwd:

   CREATE VIRTUAL TABLE passwd USING csv_reader('/etc/passwd');
   SELECT * FROM passwd;
   

Impact

• Confidentiality: High. Complete compromise of local file system confidentiality.
• Integrity: None.
• Availability: None.
• CVSS Score: 7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Remediation

Implement a sandboxing mechanism in Server Mode (e.g., a --restrict-paths flag) to limit read_* operations to designated directories.