WordPress Events Plugin SQL Injection Exploit Analysis

What this paper is

This paper, published by Red-D3v1L in 2010, describes a SQL injection vulnerability found in the "Events Calendar" plugin for WordPress. The vulnerability allows an attacker to inject malicious SQL code into the event_id parameter of the plugin's URL, potentially leading to unauthorized access to or manipulation of the WordPress database.

Simple technical breakdown

The vulnerability lies in how the WordPress Events Calendar plugin handles user input for the event_id parameter. When a user requests an event, the plugin uses the event_id from the URL to query the database. If the plugin doesn't properly sanitize or validate this input, an attacker can insert SQL commands instead of a valid event ID. This can trick the database into executing the attacker's commands, which could reveal sensitive information or alter data.

Complete code and payload walkthrough

The provided paper does not contain any executable code or specific payload bytes. It only presents a conceptual exploit string and information about the vulnerability.

• Conceptual Exploit String: http://server/[Plugins]/?event_id=[inj3ct C0dE]
  • http://server/: This represents the base URL of the vulnerable WordPress installation.
  • [Plugins]: This is a placeholder for the directory where the Events Calendar plugin is installed. In a typical WordPress setup, this would be wp-content/plugins/events-calendar/.
  • ?event_id=: This is the vulnerable parameter. The plugin likely uses the value provided here to fetch event details from the database.
  • [inj3ct C0dE]: This is the placeholder for the malicious SQL injection payload. An attacker would replace this with actual SQL commands.

Explanation of the conceptual exploit:

The core idea is to manipulate the event_id parameter. Instead of a legitimate numerical ID, an attacker would insert SQL syntax. For example, a common SQL injection technique is to append a single quote (') to break out of the intended SQL query string, followed by a logical condition that is always true (like OR 1=1), and then potentially a comment character (-- or #) to discard the rest of the original query.

Example of a potential injected payload (not provided in the paper, but illustrative):

If the plugin's backend code was something like:
$sql = "SELECT * FROM events WHERE id = " . $_GET['event_id'];

An attacker might send a request like:
http://server/wp-content/plugins/events-calendar/?event_id=1' OR '1'='1

This would result in the executed SQL query becoming:
SELECT * FROM events WHERE id = 1' OR '1'='1

The OR '1'='1' condition would cause the query to return all rows from the events table, as '1'='1' is always true.

Mapping list:

• http://server/[Plugins]/?event_id=[inj3ct C0dE] -> Conceptual representation of a vulnerable URL structure and parameter for SQL injection.

Shellcode/payload segments:

No shellcode or specific payload bytes are present in the provided source. The paper focuses on the vulnerability type and how to exploit it conceptually.

Practical details for offensive operations teams

• Required Access Level: No elevated access is required to exploit this vulnerability. It is a remote, unauthenticated vulnerability.
• Lab Preconditions:
  • A WordPress installation.
  • The "Events Calendar" plugin installed and activated. The specific version is crucial, as later versions likely patched this. Based on the publication date (2010), older versions are the target.
  • A web server capable of running PHP.
• Tooling Assumptions:
  • Web browser for manual testing.
  • Web proxy (e.g., Burp Suite, OWASP ZAP) for intercepting and modifying requests.
  • SQL injection tools (e.g., sqlmap) could automate the discovery and exploitation once the vulnerable parameter is identified.
• Execution Pitfalls:
  • Version Specificity: The vulnerability is highly dependent on the exact version of the Events Calendar plugin. Older versions are vulnerable; newer ones are likely patched.
  • Web Application Firewalls (WAFs): Modern WAFs can detect and block common SQL injection patterns, requiring evasion techniques.
  • Database Errors: Malformed SQL injections might lead to database errors that reveal information but don't achieve the intended payload execution.
  • Incorrect Plugin Path: The [Plugins] placeholder needs to be correctly identified for the specific WordPress installation.
  • Limited Impact: The impact of the SQL injection depends on the database schema and the attacker's ability to craft effective queries. It might not always lead to full database compromise.
• Tradecraft Considerations:
  • Reconnaissance: Identify the WordPress version and installed plugins, specifically looking for the "Events Calendar" plugin and its version. This is critical.
  • Payload Crafting: Develop SQL injection payloads tailored to the specific database system (e.g., MySQL, PostgreSQL) and the plugin's query structure. This might involve UNION-based attacks, error-based attacks, or blind SQL injection.
  • Data Exfiltration: Plan how to exfiltrate data once access is gained. This could involve extracting user credentials, sensitive event details, or other database content.
  • Stealth: Avoid noisy, brute-force SQL injection attempts that might trigger WAFs or logging. Use techniques like time-based blind SQL injection for stealth.

Where this was used and when

• Context: This vulnerability was relevant to WordPress websites using older versions of the "Events Calendar" plugin.
• Approximate Years/Dates: The exploit paper was published on January 2, 2010. Therefore, the vulnerability was likely actively exploited or discoverable in the period leading up to and shortly after 2010. It's a classic example of a vulnerability from the early days of widespread WordPress adoption.

Defensive lessons for modern teams

• Input Validation and Sanitization: Always validate and sanitize all user-supplied input, especially data used in database queries. Use parameterized queries or prepared statements to prevent SQL injection.
• Keep Software Updated: Regularly update WordPress core, themes, and plugins to patch known vulnerabilities.
• Web Application Firewalls (WAFs): Deploy and configure WAFs to detect and block common attack patterns, including SQL injection.
• Least Privilege: Ensure the database user account used by WordPress has only the necessary permissions. Avoid using administrative accounts for routine operations.
• Security Audits and Code Reviews: Conduct regular security audits and code reviews of custom plugins and themes to identify and fix vulnerabilities before they are exploited.
• Logging and Monitoring: Implement robust logging and monitoring to detect suspicious database activity or web requests.

ASCII visual (if applicable)

This vulnerability is primarily about a web request and its interaction with a backend script and database. An ASCII visual can illustrate this flow.

+-----------------+      +-----------------+      +-----------------+
| Attacker's      |----->| Web Browser/    |----->| WordPress       |
| Machine         |      | Proxy           |      | Server          |
+-----------------+      +-----------------+      +-------+---------+
                                                          |
                                                          | (HTTP Request with
                                                          |  malicious event_id)
                                                          v
                                                 +-----------------+
                                                 | PHP Script      |
                                                 | (Events Plugin) |
                                                 +-------+---------+
                                                         |
                                                         | (Constructs SQL Query)
                                                         v
                                                 +-----------------+
                                                 | Database Server |
                                                 +-----------------+
                                                         ^
                                                         | (Returns Data or Error)
                                                         |
                                                 +-----------------+
                                                 | WordPress       |
                                                 | Server          |
                                                 +-----------------+
                                                          |
                                                          | (HTTP Response)
                                                          v
+-----------------+      +-----------------+      +-----------------+
| Attacker's      |      | Web Browser/    |<-----| WordPress       |
| Machine         |      | Proxy           |      | Server          |
+-----------------+      +-----------------+      +-----------------+

Explanation:

1. The attacker crafts a malicious HTTP request targeting the WordPress server.
2. This request, containing the injected event_id, is sent to the WordPress server.
3. The Events Calendar plugin's PHP script receives the request.
4. The script attempts to build a SQL query using the event_id directly.
5. The malicious SQL injection causes the database to execute unintended commands (e.g., return all data, error out, or perform other actions).
6. The database responds to the WordPress script.
7. The WordPress server sends a response back to the attacker, potentially revealing sensitive data or causing an error.

Source references

• Paper ID: 10929
• Paper Title: WordPress Plugin Events - SQL Injection
• Author: Red-D3v1L
• Published: 2010-01-02
• Paper URL: https://www.exploit-db.com/papers/10929
• Raw URL: https://www.exploit-db.com/raw/10929

Original Exploit-DB Content (Verbatim)

+===================================================================================+
            ./SEC-R1Z   _ __ _  _ _ _ ___ _ _ _ _   __  _ _ _ _ _           
            / /_ _ _ _ /   _ _\/   _ _ /\        \<   |/_ _ _ _ / 
            \ \_ _ _ _/  /___ /  /   __  |  |)   / |  |   /   /
             \_ _ _ _/  /___ /  /  | __ ||      /  |  |  /   /
              _______\  \_ _ \  \2_0_0_9 |      \  |  | /   /____
            /_ _ _ _ _\ _ _ _/\ _ _ _ /  |__|\ __\ |__|/_ _ _ _ _\ R.I.P MichaelJackson !!!!!
+===================================================================================+

        [?] ~ Note : sEc-r1z CrEw# r0x !
==============================================================================
        [?] Wordpress script <== x.x.x (Events Plugins)SQL Injection Vulnerability
==============================================================================
    [?] My home:              [ http://sec-r1z.com ]
    [?] Script:               [ Wordpress Script All Versi0n ]
    [?] Language:             [ PHP ]
    [?] Vendor                [http://wordpress.org/extend/plugins/events-calendar/ ]
    [?] Founder:              [ ./Red-D3v1L ]
    [?] Gr44tz to:            [ sec-r1z# Crew - Hackteach Team - My L0ve ~A~ ]
    [?] Fuck To :             [ Zombie_KsA << big big big L4m3r ] 
########################################################################
  
===[ Exploit SQL ]===
  
[»]SQL : http://server/[Plugins]/?event_id=[inj3ct C0dE]
 

==============================================================================

#sEc-r1z.com Str1kEz y0u !