CVE-2021-28171
📋 TL;DR
CVE-2021-28171 is an authentication bypass vulnerability in Vangene deltaFlow E-platform where attackers can manipulate cookie data to gain privileged permissions remotely. This affects all systems running vulnerable versions of the deltaFlow E-platform. Attackers can exploit this without authentication to compromise the platform.
💻 Affected Systems
- Vangene deltaFlow E-platform
📦 What is this software?
Deltaflow by Deltaflow Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with administrative privileges, allowing data theft, system manipulation, and further network compromise.
Likely Case
Unauthorized access to sensitive data and system functions, potentially leading to data breach or service disruption.
If Mitigated
Limited impact with proper network segmentation and monitoring, but still poses authentication bypass risk.
🎯 Exploit Status
Exploitation involves cookie manipulation which is straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Specific version not publicly documented, contact vendor for patched release.
Vendor Advisory: https://www.chtsecurity.com/news/7f0874b5-516b-4637-842d-b6fb6c335c66
Restart Required: Yes
Instructions:
1. Contact Vangene for patched version
2. Backup current configuration and data
3. Apply vendor-provided patch
4. Restart deltaFlow E-platform services
5. Verify authentication mechanisms are working properly
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to deltaFlow E-platform to trusted IPs only.
# Use firewall rules to restrict access
iptables -A INPUT -p tcp --dport [deltaFlow-port] -s [trusted-ip] -j ACCEPT
iptables -A INPUT -p tcp --dport [deltaFlow-port] -j DROP
Web Application Firewall
allDeploy WAF with cookie validation rules to detect and block manipulation attempts.
🧯 If You Can't Patch
- Isolate the deltaFlow E-platform in a segmented network with strict access controls.
- Implement additional authentication layer (2FA) and monitor for unauthorized access attempts.
🔍 How to Verify
Check if Vulnerable:
Test if cookie manipulation allows privilege escalation by modifying authentication cookies and checking for elevated access.Check Version:
Check deltaFlow E-platform version through web interface or contact vendor for version information.Verify Fix Applied:
After patching, attempt cookie manipulation and verify authentication fails properly.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful access
- Unusual cookie values or manipulation patterns in access logs
- Administrative actions from unexpected IP addresses
Network Indicators:
- HTTP requests with manipulated cookie headers
- Traffic to deltaFlow E-platform from unexpected sources
SIEM Query:
source="deltaflow" AND (cookie="*admin*" OR cookie="*privilege*" OR status=200 AND auth_failures>3)