performing-authenticated-vulnerability-scan

name	performing-authenticated-vulnerability-scan
description	Plan and run authenticated (credentialed) vulnerability scans with scanners such as Nessus, Qualys, OpenVAS, or Rapid7 InsightVM, using SSH, SMB, WinRM, or SNMPv3 credentials to inspect installed software, patches, and configurations on Linux, Windows, and network devices. Use when a scan must catch vulnerabilities unauthenticated scanning misses, or when choosing and managing credential types for a credentialed scan.
domain	cybersecurity
subdomain	vulnerability-management
tags	["vulnerability-management","cve","authenticated-scanning","credentials","nessus","qualys","risk"]
version	1.0
author	mahipal
license	Apache-2.0
nist_csf	["ID.RA-01","ID.RA-02","ID.IM-02","ID.RA-06"]
mitre_attack	["T1190","T1203","T1068","T1003","T1110"]

Performing Authenticated Vulnerability Scan

Overview

Authenticated (credentialed) vulnerability scanning uses valid system credentials to log into target hosts and perform deep inspection of installed software, patches, configurations, and security settings. Compared to unauthenticated scanning, credentialed scans detect 45-60% more vulnerabilities with significantly fewer false positives because they can directly query installed packages, registry keys, and file system contents.

When to Use

• When conducting security assessments that involve performing authenticated vulnerability scan
• When following incident response procedures for related security events
• When performing scheduled security testing or auditing activities
• When validating security controls through hands-on testing

Prerequisites

• Vulnerability scanner (Nessus, Qualys, OpenVAS, Rapid7 InsightVM)
• Service accounts with appropriate privileges on target systems
• Secure credential storage (vault integration preferred)
• Network access from scanner to target management ports
• Written authorization from system owners

Core Concepts

Why Authenticated Scanning

Unauthenticated scanning can only assess externally visible services and banners, often leading to:

• Missed vulnerabilities in locally installed software
• Inaccurate version detection from banner changes
• Inability to check patch levels, configurations, or local policies
• Higher false positive rates due to inference-based detection

Authenticated scanning resolves these by directly querying the target OS.

Credential Types by Platform

Linux/Unix Systems

• SSH Key Authentication: RSA/Ed25519 key pairs (recommended)
• SSH Username/Password: Fallback for systems without key-based auth
• Sudo/Su Elevation: Non-root user with sudo privileges
• Certificate-based SSH: X.509 certificates for enterprise environments

Windows Systems

• SMB (Windows): Domain or local admin credentials
• WMI: Windows Management Instrumentation queries
• WinRM: Windows Remote Management (HTTPS preferred)
• Kerberos: Domain authentication with service tickets

Network Devices

• SNMP v3: USM with authentication and privacy (AES-256)