CVE-2019-25500
📋 TL;DR
Simple Job Script contains an unauthenticated SQL injection vulnerability in the register-recruiters endpoint via the employerid parameter. Attackers can execute arbitrary SQL commands to extract sensitive data or modify database contents. Any system running Simple Job Script with the vulnerable endpoint exposed is affected.
💻 Affected Systems
- Simple Job Script
📦 What is this software?
Simplejobscript by Simplejobscript
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including extraction of all user data, credentials, and administrative access, potentially leading to full system takeover.
Likely Case
Data exfiltration of sensitive information like user credentials, personal data, and job application details.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection.
🎯 Exploit Status
Exploit requires only HTTP POST requests with SQL injection payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown specific version
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Update to latest version of Simple Job Script. 2. Apply input validation and parameterized queries to employerid parameter. 3. Sanitize all user inputs before database queries.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy WAF with SQL injection rules to block malicious requests.
Endpoint Restriction
linuxRestrict access to register-recruiters endpoint to trusted IPs only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries in application code.
- Disable or remove the register-recruiters endpoint if not required.
🔍 How to Verify
Check if Vulnerable:
Send POST request to /register-recruiters with employerid parameter containing SQL injection payload like ' OR '1'='1 and observe database response.Check Version:
Check application version in admin panel or configuration files.Verify Fix Applied:
Test with same SQL injection payloads and verify they are rejected or sanitized without executing.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /register-recruiters with SQL keywords in parameters
- Multiple failed login attempts from single IP
Network Indicators:
- HTTP POST requests containing SQL injection patterns like UNION, SELECT, OR 1=1
SIEM Query:
source="web_logs" AND uri_path="/register-recruiters" AND (request_body CONTAINS "UNION" OR request_body CONTAINS "SELECT" OR request_body CONTAINS "OR 1=1")