UCStats 1.1 SQL Injection: A Historical Exploit Deep Dive

What this paper is

This paper, published by Sora in 2010, details a remote SQL injection vulnerability found in UCStats version 1.1. UCStats was a web-based statistics tracking application for games. The vulnerability allows an attacker to manipulate database queries by injecting malicious SQL code through a specific parameter in the stats.php script.

Simple technical breakdown

Web applications often use databases to store information. When a user requests data, the application constructs a query to fetch it from the database. If the application doesn't properly sanitize user input before including it in the query, an attacker can insert special characters and commands that alter the intended query. This is SQL injection. In this case, UCStats 1.1 failed to properly handle the page parameter in stats.php, allowing for SQL injection.

Complete code and payload walkthrough

The provided "Code/Proof of Concept (PoC)" is a URL, not executable code in the traditional sense. It demonstrates how to trigger the vulnerability.

URL Breakdown:

• http://server/stats.php: This is the target script within the UCStats application.
• ?game=cstrike: This parameter likely specifies the game for which statistics are being requested (e.g., Counter-Strike).
• &q=players: This parameter might indicate the type of statistics being requested (e.g., player data).
• &page=4'&sort=online&dir=asc: This is the crucial part.
  • page=4': Here, the single quote (') is injected. In SQL, a single quote is often used to delimit string literals. By closing the intended string literal for the page parameter prematurely, the attacker can then append their own SQL commands.
  • &sort=online&dir=asc: These are likely legitimate parameters that follow the injected part, and the attacker might leverage them or simply include them to make the request appear more normal.

Mapping:

• http://server/stats.php?game=cstrike&q=players&page=4'&sort=online&dir=asc -> Practical Purpose: This URL is the exploit itself. It's a crafted HTTP GET request designed to trigger the SQL injection vulnerability in stats.php by injecting a single quote into the page parameter.

Payload Explanation:

The "payload" in this context is not shellcode but rather the crafted URL that manipulates the SQL query. The injected single quote (') is the core of the payload.

• Stage 1: Injection of the single quote.

  • Purpose: To break out of the intended string context for the page parameter in the SQL query.
  • Behavior: When stats.php processes this request, it likely constructs a query like SELECT ... FROM ... WHERE page = '4' .... The injected quote changes this to SELECT ... FROM ... WHERE page = '4' ... (where the ... after the quote represents the attacker's injected SQL).
  • Output: The database receives a malformed or altered SQL query.

• Subsequent SQL Commands (Implicit): The paper doesn't explicitly show what SQL commands are appended after the injected quote. However, typical SQL injection attacks aim to:

  • Extract data: Using UNION SELECT to retrieve sensitive information from other tables.
  • Modify data: Using UPDATE or INSERT.
  • Gain unauthorized access: By bypassing authentication or dumping credentials.
  • Cause denial of service: By injecting commands that overload the database.

Unknowns: The paper does not specify the exact SQL query that stats.php constructs, nor does it provide the specific SQL commands the attacker would append after the injected quote to achieve a particular goal. This would depend on the database schema and the attacker's objective.

Practical details for offensive operations teams

• Required Access Level: Unauthenticated (remote). This vulnerability can be triggered by any user with access to the web server hosting UCStats.
• Lab Preconditions:
  • A vulnerable instance of UCStats v1.1 installed on a web server.
  • A web server (e.g., Apache, Nginx) and a compatible database (e.g., MySQL) running.
  • Network connectivity to the target web server.
• Tooling Assumptions:
  • A web browser for manual testing or crafting requests.
  • An HTTP proxy (e.g., Burp Suite, OWASP ZAP) to intercept and modify requests.
  • SQL injection tools (e.g., sqlmap) could potentially be used if the injection point is correctly identified and the tool is configured for this specific application.
• Execution Pitfalls:
  • WAF/IDS Evasion: Modern Web Application Firewalls (WAFs) and Intrusion Detection Systems (IDS) are likely to flag simple SQL injection patterns like this. Obfuscation of the injected SQL might be necessary.
  • Database Specifics: The exact payload will depend on the underlying database system (MySQL, PostgreSQL, etc.) and its version. The paper doesn't specify this.
  • Application Logic: The stats.php script might have internal checks or logic that could prevent the injection from being successful or lead to unexpected application behavior.
  • Error Handling: If the application has robust error handling that doesn't reveal database errors, it can make exploitation harder.
• Tradecraft Considerations:
  • Reconnaissance: Use Google Dorking as suggested ("Powered by UCStats version 1.1") to identify potential targets.
  • Enumeration: Understand the application's parameters and how they are used.
  • Payload Crafting: Develop specific SQL payloads to achieve objectives (e.g., data exfiltration, authentication bypass) based on the target database and schema.
  • Stealth: Avoid overly noisy injection attempts that could trigger alerts.

Where this was used and when

• Usage Context: This vulnerability was relevant for web applications using UCStats version 1.1 for game statistics tracking.
• Approximate Years/Dates: The paper was published in January 2010. Vulnerabilities of this nature are often discovered and exploited shortly after their release or when the software is widely adopted. Therefore, exploitation likely occurred around 2010 and potentially for a few years afterward until the software was patched or retired.

Defensive lessons for modern teams

• Input Validation and Sanitization: This is the cornerstone of preventing SQL injection. All user-supplied input, especially data used in database queries, must be rigorously validated and sanitized.
  • Parameterized Queries/Prepared Statements: Use these whenever interacting with a database. They separate SQL code from data, preventing malicious input from being interpreted as code.
  • Whitelisting: Only allow known-good characters or patterns for specific input fields.
• Least Privilege: Database accounts used by web applications should have only the minimum necessary permissions. This limits the damage an attacker can do even if they achieve SQL injection.
• Web Application Firewalls (WAFs): While not a silver bullet, WAFs can provide a layer of defense by detecting and blocking common attack patterns, including SQL injection attempts.
• Regular Patching and Updates: Keep all web applications and their dependencies updated to the latest secure versions.
• Secure Coding Practices: Train developers on secure coding principles, including common vulnerabilities like SQL injection.
• Database Error Hiding: Configure the web server and application to not display detailed database error messages to end-users, as these can provide valuable information to attackers.

ASCII visual (if applicable)

This is applicable. A simple diagram can illustrate the flow of a request with SQL injection.

+-----------------+      +-----------------+      +-----------------+      +-----------------+
| Attacker's      |----->| Web Server      |----->| stats.php       |----->| Database        |
| Browser         |      | (UCStats v1.1)  |      | (Vulnerable)    |      | (Target)        |
+-----------------+      +-----------------+      +-----------------+      +-----------------+
       |                                                   |
       | HTTP GET Request                                  | SQL Query
       | (with injected ')                                 | (malformed)
       | e.g., ?page=4'                                    |
       |                                                   |
       +---------------------------------------------------+
                                                           |
                                                           v
                                                 +-----------------+
                                                 | Attacker's      |
                                                 | Objective       |
                                                 | (e.g., Data     |
                                                 | Exfiltration)   |
                                                 +-----------------+

Source references

• Paper ID: 10891
• Paper Title: UCStats 1.1 - SQL Injection
• Author: Sora
• Published: 2010-01-01
• Keywords: PHP, webapps
• Paper URL: https://www.exploit-db.com/papers/10891
• Raw URL: https://www.exploit-db.com/raw/10891

Original Exploit-DB Content (Verbatim)

> UCStats 1.1 Remote SQL Injection Vulnerability
> Author: Sora
> Contact: vhr95zw [at] hotmail [dot] com
> Website: http://greyhathackers.wordpress.com/
> Google Dork: "Powered by UCStats version 1.1"

# Vulnerability Description:
UCStats version 1.1 suffers a remote SQL injection vulnerability in stats.php.

# Code/Proof of Concept (PoC):
http://server/stats.php?game=cstrike&q=players&page=4'&sort=online&dir=asc