Mysql Hacktricks Verified !exclusive! -
The phrase "mysql hacktricks verified" refers to the techniques and methodologies for verifying and exploiting MySQL vulnerabilities as documented in the HackTricks pentesting guide. Verification typically involves using logical operations or specific commands to confirm the presence of a security flaw before proceeding with data extraction or privilege escalation. Verification Techniques for MySQL
Logical Confirmation: Attackers confirm a vulnerability by injecting logical operations. For instance, if a URL like ?id=1 and ?id=2-1 return the same content, or if ?id=1' or 1=1 -- returns a "true" result, a SQL injection is verified.
Version Detection: Specific "verified" payloads check the database version to tailor further attacks. Using /*!80027 10*/ will only return results if the MySQL version is higher than 8.0.27.
Connection Verification: For network-level testing, researchers verify remote access to port 3306 using tools like nmap or mysql client commands (mysql -h ) before attempting brute-force attacks. Common Exploitation Paths (Verified on HackTricks)
Credential Extraction: Once access is verified, credentials can be extracted from files like /var/lib/mysql/mysql/user.MYD or via SQL queries targeting the mysql.user table.
Privilege Escalation: If MySQL runs as a high-privileged user (e.g., root), it can be used to execute system commands via User Defined Functions (UDF) using libraries like lib_mysqludf_sys.
File Access and SSRF: Vulnerabilities like LOAD_FILE() can be used to read local files or initiate network requests (SSRF), provided the secure_file_priv global variable is properly configured. Security Recommendations
To prevent these verified attack vectors, it is recommended to:
Use prepared statements or parameterized queries to neutralize input-based attacks.
Restrict network access by binding MySQL only to necessary interfaces and disabling remote root login.
Harden the server by removing anonymous accounts and the default "test" database. 3306 - Pentesting Mysql - HackTricks
The HackTricks MySQL Pentesting Guide provides a comprehensive methodology for identifying, enumerating, and exploiting MySQL services. The following sections detail the core techniques for interacting with MySQL as part of a security assessment. 1. External Enumeration & Connection
The first step is identifying the service and attempting to establish a connection. Default Port: MySQL typically listens on 3306/tcp. Local Connection: Connect as root without a password: mysql -u root. Connect with a password prompt: mysql -u root -p. Remote Connection: Connect to a specific host: mysql -h .
Some enumeration actions, such as banner grabbing or version checks, may require valid credentials. 2. Information Gathering (Internal Enumeration)
Once access is gained, use the following commands to map the database structure and privileges:
Privilege Check: Query the mysql.user table to view current users, their permissions, and password hashes. Command: SELECT * FROM mysql.user; mysql hacktricks verified
Plugin Directory: Identify where the database stores its plugins, which is crucial for advanced exploitation like UDF. Command: SHOW VARIABLES LIKE '%plugin%';
Configuration Review: Variables like secure_file_priv determine if you can read or write files to the host system. 3. SQL Injection (SQLi) Techniques
HackTricks emphasizes various SQLi methods to bypass authentication or extract data.
Detection: Confirm vulnerabilities using logical operations (e.g., ?id=1 and ?id=2-1 returning the same result) or timing-based delays.
Column Identification: Use ORDER BY or GROUP BY to determine the number of columns in the original query before attempting a UNION attack. Exploitation Types:
Union-Based: Merging your own queries with the original to fetch data.
Error-Based: Forcing the database to display data within error messages.
Blind SQLi: Using boolean or time-based (e.g., SLEEP) queries when no direct output is visible.
Automation: Tools like Sqlmap can automate these processes using techniques like --technique=BEUSTQ. 4. Privilege Escalation & RCE
If you have high-level database access (e.g., as root), you can often escalate to a system shell.
User Defined Functions (UDF): This is a classic method to execute OS commands. It involves loading a binary library (like lib_mysqludf_sys.so) into a table and then dumping it into the MySQL plugin directory to create a new function (e.g., sys_exec). File Reading/Writing:
Use LOAD_FILE() to read sensitive host files like /etc/passwd.
Use SELECT ... INTO DUMPFILE to write files to the system, which can be used to drop a web shell if a web server is present.
Service Misconfigurations: Check if the MySQL service is running as a high-privileged user (like root or SYSTEM), which directly grants those privileges upon successful shell execution.
MySQL Security Assessment and Exploitation Framework This paper outlines the core methodologies for assessing and exploiting MySQL databases, synthesized from the verified security research and techniques documented in HackTricks 1. Abstract The phrase "mysql hacktricks verified" refers to the
As one of the most widely used relational database management systems, MySQL is a frequent target for attackers. This framework details verified exploitation vectors—ranging from initial reconnaissance to advanced privilege escalation—providing security professionals with a structured approach to identifying and mitigating MySQL-specific vulnerabilities. 2. Reconnaissance and Initial Access
The first stage of a MySQL assessment involves identifying the service and potential entry points. Default Port Identification : Scanning for TCP port Banner Grabbing : Connecting via
to identify the specific version, which determines the availability of known CVEs. Authentication Testing Testing for the root user with no password (common in misconfigured dev environments). Brute-forcing credentials using tools like mysql-brute 3. Exploitation Techniques
Once access is gained, several verified "HackTricks" can be employed to deepen the compromise. A. File System Interaction secure_file_priv
variable is empty or misconfigured, attackers can interact with the host OS: Reading Files LOAD DATA INFILE '/etc/passwd' INTO TABLE temp_table; to exfiltrate system configuration files. Writing Shells
SELECT '' INTO OUTFILE '/var/www/html/shell.php'; to achieve Remote Code Execution (RCE). B. Privilege Escalation via UDF
User Defined Functions (UDF) allow the execution of shared library functions. : Uploading a malicious (Linux) or (Windows) file to the plugin directory.
: Executing system commands with the privileges of the user running the MySQL service (often C. Exploiting the "Old Passwords" Vulnerability
In legacy environments, MySQL may use the older, weaker 16-byte hashing algorithm, which is highly susceptible to fast offline cracking. 4. Bypassing Authentication (CVE-2012-2122)
On certain Linux distributions, a verified vulnerability allowed attackers to bypass authentication by repeatedly attempting to log in with an incorrect password. Due to a casting error, there was a 1 in 256 chance the server would accept the wrong password as correct. 5. Post-Exploitation and Lateral Movement Enumerating Users : Extracting hashes from mysql.user Sensitive Data Discovery
: Automated scripts to search for "API", "password", or "key" across all schemas. Stealing SSH Keys LOAD_FILE() to check default locations like /root/.ssh/id_rsa 6. Conclusion and Remediation Securing MySQL requires a multi-layered approach: Strict File Permissions : Configuring secure_file_priv to a dedicated, non-web-accessible directory. Principle of Least Privilege : Disabling the privileges for application users. Network Isolation
: Ensuring the database is only accessible via local sockets or a VPN, never exposed directly to the internet. exploitation steps or mitigation configurations
The MySQL HackTricks verified methodology is a comprehensive framework used by penetration testers to identify, enumerate, and exploit MySQL database vulnerabilities. By following a structured approach—from initial connection testing to advanced SQL injection—security professionals can uncover misconfigurations and data exposure risks. 1. Initial Connection and Enumeration
Before attempting exploitation, testers must gather basic information about the MySQL instance.
Standard Connection: Checking for weak or default credentials. Connect as root without a password: mysql -u root. Connect with a prompt: mysql -u root -p. Limitation: File must be readable by mysql OS
Scanning with Nmap: Automating the identification of the MySQL service (default port 3306) and running audit scripts. nmap -sV -p 3306 --script mysql-audit.
Basic Commands: Once connected, use built-in commands to map the database structure: show databases; use show tables; describe . 2. Verified MySQL Injection Techniques
HackTricks highlights several "verified" injection vectors that allow attackers to bypass standard web protections.
Union-Based Injection: Used to retrieve data by appending a UNION SELECT statement to the original query.
Error-Based Injection: Triggering specific database errors (e.g., using HAVING or GROUP BY) to reveal column names or version info. Blind Injection (Boolean & Time-Based):
Boolean: Testing true/false conditions like substr(database(),1,1)='r' to infer data one character at a time.
Time-Based: Using SLEEP() or BENCHMARK() functions to detect vulnerabilities by measuring the server's response time. WAF Bypass Tricks:
Version Comments: Using /*! 40110 and 1=0*/ to fingerprint versions or hide code from simple filters.
Hex Encoding: Replacing strings with hex values (e.g., 0x4125 for A%) to avoid single quote filters. 3. Advanced Post-Exploitation
If the database user has sufficient privileges (e.g., FILE privilege), further system-level access is possible.
Arbitrary File Read: Using LOAD DATA LOCAL INFILE to read files from the server's filesystem.
Webshell Upload: Utilizing SELECT ... INTO OUTFILE to write a malicious PHP shell directly into the webroot.
SSRF Exploitation: Triggering Server-Side Request Forgery through specific MySQL functions to scan internal networks. 4. Security Best Practices (Mitigation)
Securing a MySQL instance requires a "full-stack" approach to block these HackTricks-verified methods. Pentesting Mysql - MK/hacktricks - Gitee
5. Defensive Validation: Why “Verified” Matters
For blue teams and defenders, the “HackTricks verified” label serves as a checklist for hardening. Each verified technique should trigger a specific control:
| Attack Vector | Verified HackTricks Technique | Defensive Mitigation |
|---------------|-------------------------------|----------------------|
| Credential brute‑force | hydra -l root -P wordlist.txt mysql://target | Enforce account lockout, use strong passwords, restrict network access to 3306 |
| UDF privilege escalation | Uploading udf.so to plugin directory | Set secure_file_priv = "" or a specific safe directory; run MySQL as non‑root user |
| File read via LOAD_FILE | SELECT LOAD_FILE('/etc/shadow') | Disable FILE privilege unless absolutely necessary; use SELinux/apparmor |
| Writing web shell | INTO OUTFILE to webroot | Set secure_file_priv to a directory not accessible by the web server; use prepared statements against SQLi |
Defenders are encouraged to run the verified attacks in a sandboxed environment to understand their own risk exposure.
Read Arbitrary Files
SELECT LOAD_FILE('/etc/passwd');
SELECT LOAD_FILE('/var/www/html/config.php');
- Limitation: File must be readable by
mysqlOS user, absolute path required.
4.2 Error-Based Injection (Extract Data via Errors)
SELECT 1 AND EXTRACTVALUE(1, CONCAT(0x7e, database(), 0x7e));