CVE-2020-28360
📋 TL;DR
CVE-2020-28360 is a Server-Side Request Forgery (SSRF) vulnerability in the private-ip npm package versions 1.0.5 and below. The insufficient regular expression filtering allows attackers to bypass IP address restrictions and make requests to reserved IP ranges, potentially accessing internal resources or executing arbitrary code. This affects any application using the vulnerable private-ip package for IP validation.
💻 Affected Systems
- private-ip npm package
📦 What is this software?
Private Ip by Private Ip Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on affected servers, complete compromise of internal network resources, and data exfiltration through SSRF attacks.
Likely Case
Unauthorized access to internal services, data leakage from internal APIs, and potential lateral movement within the network.
If Mitigated
Limited impact with proper network segmentation, egress filtering, and input validation controls in place.
🎯 Exploit Status
SSRF exploitation is well-documented and tools exist to automate attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.6
Vendor Advisory: https://github.com/frenchbread/private-ip
Restart Required: No
Instructions:
1. Update package.json to specify 'private-ip': '^1.0.6'. 2. Run 'npm update private-ip'. 3. Test application functionality.
🔧 Temporary Workarounds
Implement additional IP validation
allAdd custom IP validation logic to supplement private-ip filtering
Network egress filtering
allRestrict outbound connections from application servers to only necessary destinations
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy web application firewall with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Check package.json or package-lock.json for private-ip version <=1.0.5Check Version:
npm list private-ipVerify Fix Applied:
Verify private-ip version is 1.0.6 or higher in package.json and node_modules📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from application servers
- Requests to internal IP ranges from external sources
Network Indicators:
- HTTP requests to reserved IP ranges (RFC 1918, etc.)
- Unexpected traffic patterns from application servers
SIEM Query:
source_ip=application_server AND dest_ip IN (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 127.0.0.0/8)