CVE-2021-44793
📋 TL;DR
CVE-2021-44793 is an authorization bypass vulnerability in Single Connect's sc-reports-ui module that allows unauthenticated remote attackers to access device configuration pages and export sensitive data. This can lead to database credential theft and potential command execution with high privileges. Organizations using vulnerable Single Connect deployments are affected.
💻 Affected Systems
- Single Connect
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full database access, executes arbitrary commands with high privileges, and potentially compromises the entire system and connected infrastructure.
Likely Case
Attacker extracts database credentials and sensitive configuration data, leading to data breach and potential lateral movement within the network.
If Mitigated
With proper network segmentation and access controls, impact is limited to the affected Single Connect instance with no lateral movement possible.
🎯 Exploit Status
Exploitation requires only HTTP access to the vulnerable endpoint with no authentication. Simple curl commands or web requests can trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references - check vendor advisory
Vendor Advisory: https://www.usom.gov.tr/bildirim/tr-22-0093
Restart Required: Yes
Instructions:
1. Check vendor advisory for specific patched version
2. Backup current configuration
3. Apply vendor-provided patch or update
4. Restart Single Connect services
5. Verify authorization checks are now enforced
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to Single Connect administration interfaces to trusted IPs only
iptables -A INPUT -p tcp --dport [SINGLE_CONNECT_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [SINGLE_CONNECT_PORT] -j DROP
Module Disablement
allDisable the vulnerable sc-reports-ui module if not required
Check Single Connect documentation for module disablement procedure
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Single Connect from internet and untrusted networks
- Deploy web application firewall (WAF) rules to block access to sc-reports-ui endpoints
🔍 How to Verify
Check if Vulnerable:
Attempt to access /sc-reports-ui or similar endpoints without authentication. If configuration data is accessible, system is vulnerable.Check Version:
Check Single Connect administration interface or configuration files for version informationVerify Fix Applied:
After patching, attempt same unauthorized access - should receive authentication/authorization error instead of configuration data.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to /sc-reports-ui endpoints
- Configuration export requests from unauthorized users
- Database connection attempts from unexpected sources
Network Indicators:
- HTTP requests to sc-reports-ui paths without prior authentication
- Unexpected data exports from Single Connect system
SIEM Query:
source="single-connect" AND (uri="/sc-reports-ui" OR uri="*export*" OR uri="*config*") AND user="-"