NPM IP Package v2.0.1 SSRF Bypass Vulnerability Analysis (CVE-2021-43859)

Critical Vulnerability Information Vulnerability Overview CVE ID: CVE-2021-43859 Product: NPM IP Package v2.0.1 Affected Versions: 2.0.1 (v2.0.1 is Current Latest) Vulnerability Type: Multiple SSRF Bypass Vulnerabilities CVSS Score: 9.8 (Critical) Vulnerability Details Primary Bypass Techniques: 1. Null Route Bypass: -> localhost:8080 2. Octal Localhost Bypass: -> localhost:8080 Affected Functions: - : Used to check if an IP is private - : Already patched, but not fully resolved Root Cause Analysis Logical flaws in the and functions when processing IP addresses allow bypassing SSRF protections. Impact Assessment Severity: CRITICAL (CVSS 9.8) Primary Impacts: - SSRF: Attackers can exploit SSRF structures to launch attacks - Internal Network Access: Access to internal resources and APIs - Data Leakage: Exposure of sensitive data and configurations - Service Disruption: Causes service unavailability or functional degradation Secondary Impacts: - Privilege Escalation: Access to protected backend resources - Authentication Bypass: Access to authenticated APIs - Global Module Access: Access to globally installed NPM packages - Network Tracking: Attackers may track via log records Mitigation Recommendations Immediate Actions: - Update the function to properly handle all IP addresses - Fully fix the function - Special handling: Address edge cases involving routing and DNS servers Timeline September 1, 2021: Vulnerability discovered and reported September 2, 2021: Developer confirmed September 3, 2021: Documentation created September 5, 2021: Patch potentially released (exact date pending) September 6, 2021: CVE assignment request submitted

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NPM IP Package v2.0.1 SSRF Bypass Vulnerability Analysis (CVE-2021-43859)