CVE-2023-33481
📋 TL;DR
RemoteClinic 2.0 contains a time-based blind SQL injection vulnerability in the patients/index.php 'start' parameter that allows attackers to extract database information through timing delays. This affects all organizations using RemoteClinic 2.0 with the vulnerable component exposed. Attackers can potentially access sensitive patient data and system information.
💻 Affected Systems
- RemoteClinic
📦 What is this software?
Remote Clinic by Remoteclinic
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to exposure of all patient records, administrative credentials, and potential remote code execution on the underlying server.
Likely Case
Extraction of sensitive patient data, user credentials, and system configuration information through automated SQL injection attacks.
If Mitigated
Limited information disclosure if database permissions are properly restricted and input validation is implemented.
🎯 Exploit Status
Time-based blind SQL injection requires automated tools but is well-documented and easily weaponized. The GitHub issue contains technical details that facilitate exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://github.com/remoteclinic/RemoteClinic/issues/25
Restart Required: No
Instructions:
1. Check GitHub repository for updated version. 2. Apply parameterized queries to the 'start' parameter in patients/index.php. 3. Implement proper input validation and sanitization.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allImplement WAF rules to block SQL injection patterns in the 'start' parameter
# Example ModSecurity rule: SecRule ARGS:start "@detectSQLi" "id:1001,phase:2,deny,status:403"
Input Validation Filter
allAdd input validation to only accept numeric values for the 'start' parameter
# PHP example: if(!is_numeric($_GET['start'])) { die('Invalid input'); }
🧯 If You Can't Patch
- Block external access to patients/index.php using network ACLs or firewall rules
- Implement rate limiting and monitoring for suspicious requests to the vulnerable endpoint
🔍 How to Verify
Check if Vulnerable:
Test the patients/index.php endpoint with payloads like: patients/index.php?start=1' AND SLEEP(5)--Check Version:
Check RemoteClinic version in configuration files or admin interfaceVerify Fix Applied:
Verify that parameterized queries are implemented and test with SQL injection payloads to confirm they are blocked📡 Detection & Monitoring
Log Indicators:
- Multiple requests with SQL keywords in 'start' parameter
- Unusually long response times for patients/index.php requests
- Patterns of SLEEP(), BENCHMARK(), or WAITFOR DELAY in query strings
Network Indicators:
- SQL injection payloads in HTTP GET parameters
- Repeated requests with incremental timing delays
SIEM Query:
source="web_logs" AND (uri="*patients/index.php*" AND query="*start=*SLEEP*" OR query="*start=*WAITFOR*" OR query="*start=*BENCHMARK*")