Comprehensive Technical Analysis of CVE-2023-2713

CVE ID: CVE-2023-2713 CVSS Score: 9.8 (Critical) Vulnerability Type: Authorization Bypass Through User-Controlled Key (CWE-639) Affected Component: Rental Module (Third-Party Add-on for Ideasoft E-commerce Platform)

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1. Vulnerability Assessment & Severity Evaluation

Vulnerability Classification

CVE-2023-2713 is classified as an Authorization Bypass Through User-Controlled Key vulnerability (CWE-639), a subset of Insecure Direct Object Reference (IDOR) flaws. This occurs when an application uses user-supplied input (e.g., a key, ID, or token) to access data or perform actions without proper authorization checks.

Severity Justification (CVSS 9.8 - Critical)

The CVSS v3.1 scoring breakdown is as follows:

Metric	Score	Justification
Attack Vector (AV)	Network	Exploitable remotely over HTTP/HTTPS.
Attack Complexity (AC)	Low	No specialized conditions required.
Privileges Required (PR)	None	No authentication needed.
User Interaction (UI)	None	Exploitable without user interaction.
Scope (S)	Unchanged	Affects the vulnerable component only.
Confidentiality (C)	High	Unauthorized access to sensitive data.
Integrity (I)	High	Unauthorized modifications possible.
Availability (A)	High	Potential denial of service or data corruption.

Impact: The vulnerability allows unauthenticated attackers to bypass authentication and authorization mechanisms, leading to full system compromise (data theft, privilege escalation, or service disruption).

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2. Potential Attack Vectors & Exploitation Methods

Exploitation Mechanism

The vulnerability likely stems from improper validation of user-controlled keys in the Rental Module’s authentication or session management logic. Possible exploitation scenarios include:

A. Authentication Bypass via Manipulated Session Tokens

• The application may use predictable or user-controlled session identifiers (e.g., user_id, session_token, rental_id) to grant access.
• An attacker could modify these values in API requests, cookies, or hidden form fields to impersonate other users.
• Example Attack:

  GET /api/rental/view?rental_id=123 HTTP/1.1
  Host: vulnerable-ecommerce-site.com
  Cookie: session_token=MALICIOUS_USER_TOKEN
  

  If the backend does not validate ownership, the attacker gains access to rental_id=123 without proper authorization.

B. Direct Object Reference (IDOR) Exploitation

• The module may expose RESTful endpoints or database queries that rely on user-supplied IDs.
• An attacker could enumerate IDs (e.g., 1, 2, 3...) to access other users' rental records, payment details, or administrative functions.
• Example Attack:

  POST /api/rental/update HTTP/1.1
  Host: vulnerable-ecommerce-site.com
  Content-Type: application/json
  
  {
    "rental_id": "VICTIM_RENTAL_ID",
    "status": "cancelled",
    "payment_method": "attacker_credit_card"
  }
  

C. Privilege Escalation via Role Manipulation

• If the module uses user-controlled role identifiers (e.g., role=admin), an attacker could escalate privileges by modifying them.
• Example Attack:

  GET /api/user/profile?user_id=ATTACKER_ID&role=admin HTTP/1.1
  Host: vulnerable-ecommerce-site.com
  

Exploitation Requirements

• No authentication required (CVSS: PR:None).
• No user interaction needed (CVSS: UI:None).
• Network access to the vulnerable e-commerce platform (CVSS: AV:N).

Proof-of-Concept (PoC) Considerations

• Reconnaissance: Identify vulnerable endpoints via:
  • Burp Suite / OWASP ZAP (intercepting requests).
  • Fuzzing (e.g., ffuf, wfuzz) to test for IDOR.
• Exploitation:
  • Modify rental_id, user_id, or session_token in requests.
  • Use session fixation or token manipulation to hijack accounts.

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3. Affected Systems & Software Versions

Vulnerable Component

• Rental Module (Third-party add-on for Ideasoft E-commerce Platform).
• Affected Versions: All versions before 23.05.15.

Ideasoft E-commerce Platform Context

• Primary Use Case: Turkish e-commerce websites (common in retail, rental services).
• Deployment: Typically hosted on Linux/Windows servers with PHP/MySQL or Java-based backends.
• Integration: The Rental Module is likely a plugin with its own authentication and authorization logic.

Indicators of Compromise (IoCs)

• Unusual API requests with manipulated rental_id or user_id parameters.
• Unauthorized access logs to sensitive endpoints (e.g., /api/rental/admin).
• Session token anomalies (e.g., tokens not matching expected formats).

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4. Recommended Mitigation Strategies

Immediate Actions (Patch & Workarounds)

Mitigation	Details	Effectiveness
Apply Vendor Patch	Upgrade Rental Module to v23.05.15 or later.	High (Eliminates root cause)
Disable Rental Module	Temporarily disable the module if patching is delayed.	Medium (Disrupts business)
WAF Rules	Deploy ModSecurity or Cloudflare WAF to block IDOR attempts.	Medium (Partial protection)
Input Validation	Enforce strict whitelisting for rental_id, user_id, etc.	Medium (Reduces attack surface)
Rate Limiting	Limit API requests to prevent brute-force IDOR attacks.	Low (Does not fix root cause)

Long-Term Security Hardening

1. Implement Proper Authorization Checks

   • Use server-side validation to ensure users can only access their own data.
   • Example (Pseudocode):

     if ($current_user_id !== $request->get('user_id')) {
         throw new AuthorizationException("Unauthorized access");
     }
     

2. Adopt Indirect Object References

   • Replace direct IDs (e.g., rental_id=123) with opaque tokens (e.g., UUIDs or hashed values).
   • Example:

     GET /api/rental/view?token=abc123-xyz456
     

3. Enforce Least Privilege

   • Restrict API endpoints to authenticated users only.
   • Use role-based access control (RBAC) for sensitive operations.

4. Logging & Monitoring

   • Log all authentication/authorization attempts (successful & failed).
   • Alert on suspicious activity (e.g., rapid ID enumeration).

5. Security Testing

   • Conduct penetration testing (focus on IDOR, broken access control).
   • Use static/dynamic analysis tools (e.g., SonarQube, Burp Scanner).

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5. Impact on Cybersecurity Landscape

Business & Operational Risks

• Data Breaches: Unauthorized access to customer PII, payment data, rental records.
• Financial Fraud: Attackers could modify rental agreements, cancel bookings, or redirect payments.
• Reputation Damage: Loss of customer trust, regulatory fines (e.g., GDPR, KVKK in Turkey).
• Operational Disruption: Potential DoS via mass cancellation of rentals.

Broader Implications

• Supply Chain Risk: Third-party modules (like this Rental Module) are high-risk vectors for e-commerce platforms.
• Regulatory Scrutiny: Organizations may face compliance audits (e.g., PCI DSS, ISO 27001) if breached.
• Exploit Proliferation: Public PoCs could lead to widespread attacks on unpatched systems.

Threat Actor Motivations

Actor Type	Likely Motivation
Cybercriminals	Financial gain (fraud, ransomware).
Hacktivists	Disruption of e-commerce services.
Competitors	Corporate espionage, sabotage.
Script Kiddies	Bragging rights, low-effort attacks.

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6. Technical Details for Security Professionals

Root Cause Analysis

The vulnerability likely arises from one or more of the following flaws:

1. Missing Authorization Checks

   • The Rental Module does not verify if a user has permission to access/modify a resource.
   • Example (Vulnerable Code):

     $rental = Rental::find($_GET['rental_id']); // No ownership check
     echo $rental->customer_data;
     

2. Predictable or User-Controlled Keys

   • The application uses sequential IDs (e.g., 1, 2, 3...) or user-supplied tokens without validation.
   • Example (Vulnerable API):

     GET /api/rental?user_id=123 HTTP/1.1
     

     An attacker changes user_id=123 to user_id=1 to access an admin account.

3. Insecure Session Management

   • Session tokens or cookies are not bound to user identity.
   • Example:

     Cookie: session_token=USER_CONTROLLED_VALUE
     

Exploitation Flow

1. Reconnaissance:

   • Identify vulnerable endpoints (e.g., /api/rental, /user/profile).
   • Enumerate IDs via brute-force or error messages.

2. Exploitation:

   • Modify rental_id, user_id, or session_token in requests.
   • Example (Burp Suite Request):

     POST /api/rental/update HTTP/1.1
     Host: target.com
     Content-Type: application/json
     
     {
       "rental_id": "VICTIM_ID",
       "status": "cancelled",
       "refund_method": "attacker_account"
     }
     

3. Post-Exploitation:

   • Data Exfiltration: Steal customer records, payment details.
   • Privilege Escalation: Gain admin access via role manipulation.
   • Persistence: Install backdoors (e.g., web shells).

Detection & Forensics

• Log Analysis:
  • Look for unusual rental_id or user_id values in access logs.
  • Check for failed authorization attempts followed by successful access.
• Network Traffic:
  • Monitor for repeated API calls with incrementing IDs.
• Endpoint Detection:
  • Use EDR/XDR (e.g., CrowdStrike, SentinelOne) to detect anomalous process execution.

Advanced Mitigation Techniques

• JWT/OAuth2 Hardening:
  • Use short-lived tokens with strong signing (e.g., RS256).
  • Implement token binding to user sessions.
• Database-Level Security:
  • Enforce row-level security (RLS) in PostgreSQL.
  • Use stored procedures to abstract direct table access.
• Zero Trust Architecture:
  • Microsegmentation to limit lateral movement.
  • Continuous authentication (e.g., behavioral biometrics).

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Conclusion & Recommendations

CVE-2023-2713 represents a critical authorization bypass in a widely used e-commerce module, posing severe risks to affected organizations. Given its CVSS 9.8 score, immediate patching is essential, followed by comprehensive security hardening.

Key Takeaways for Security Teams

✅ Patch Immediately: Upgrade to Rental Module v23.05.15+. ✅ Audit Access Controls: Ensure all endpoints enforce proper authorization. ✅ Monitor for Exploitation: Deploy SIEM rules to detect IDOR attempts. ✅ Educate Developers: Train teams on secure coding practices (OWASP Top 10). ✅ Third-Party Risk Management: Assess all plugins/modules for similar flaws.

Further Reading

• OWASP: Insecure Direct Object Reference (IDOR)
• CWE-639: Authorization Bypass Through User-Controlled Key
• NIST SP 800-53: Access Control (AC) Family

Final Note: Given the public disclosure and high exploitability, organizations should treat this as a priority 1 vulnerability and respond accordingly.