Authenticated scanning on Azure VMs using Tenable with credentialed checks — validating patch levels, local security policy, and installed software beyond what network-only scans reveal.
Scripted remediation with rollback capability, staged deployment (one host first), and independent verification through rescan — not self-attestation.
Quantified risk reduction (80% vulnerability decrease), KPI tracking, and transition to recurring scan cadence with SLA-driven follow-up.
Targets use intentionally weakened configurations — outdated software, legacy protocols enabled, misconfigured permissions — to generate realistic scan findings. This creates a genuine remediation backlog rather than scanning a hardened system and claiming zero vulnerabilities.
Unauthenticated (network) scans see what an external attacker sees. Authenticated scans log into the target and inspect installed patches, local group membership, registry settings, file permissions, and service configurations. The difference is often 3-5x more findings — and the additional findings are typically the ones that matter most for local privilege escalation and lateral movement.
Raw scan results were triaged into remediation rounds using this priority order — attack surface reduction first, then defense hardening, then patching. This sequence maximizes risk reduction per hour of effort.
| Priority | Category | Rationale |
|---|---|---|
| P1 | Attack Surface Removal | Remove unnecessary software (Wireshark, outdated Firefox) — eliminates entire vulnerability classes |
| P2 | Cryptographic Hardening | Disable legacy protocols (SSL 2.0/3.0, TLS 1.0/1.1) and enforce strong cipher suites |
| P3 | Privilege & Access Fixes | Remove guest from Administrators, disable guest account, fix file permissions |
| P4 | OS & Software Patching | Apply OS updates, upgrade OpenSSL, address remaining CVEs |
Finding: Third-party tools installed on servers where they serve no operational purpose. Outdated versions contain known CVEs exploitable for local privilege escalation or remote code execution.
Risk: Every unnecessary application expands the attack surface. An outdated Wireshark on a server is a privilege escalation vector that exists purely because no one removed it.
Finding: Legacy SSL/TLS protocols (SSL 2.0, SSL 3.0, TLS 1.0, TLS 1.1) and weak cipher suites enabled. SMBv1 active on endpoints.
Risk: Weak cryptographic protocols enable man-in-the-middle attacks and are targeted by tools like POODLE (SSL 3.0) and BEAST (TLS 1.0). SMBv1 is the attack surface for EternalBlue (MS17-010).
Finding: Guest account active and added to local Administrators group. Linux file permissions
on /etc/shadow and /etc/passwd set to world-readable/writable (777).
Risk: Guest-in-Administrators is a textbook privilege escalation path — any user can authenticate as Guest and inherit full admin rights. World-writable shadow files allow any local user to modify password hashes.
Finding: OS patch level stale, OpenSSL vulnerable to known CVEs, WinVerifyTrust signature validation bypass (CVE-2013-3900) unpatched.
Risk: Known vulnerabilities with public exploits remain active. CVE-2013-3900 allows attackers to modify signed executables without invalidating the signature — a defense evasion technique used in real-world supply chain attacks.
PowerShell Requires Admin
PowerShell Requires Admin
Bash Requires Root
Bash Requires Root
Each script in the library maps to a specific Tenable Plugin ID and CVE. The naming convention
(remediation-{component}.{ext}) enables rapid lookup during remediation sprints.
Toggle scripts allow both vulnerability creation (for lab reset) and remediation, supporting
repeatable testing cycles.
| Round | Category | Findings Resolved | Method |
|---|---|---|---|
| R1 | Software Removal | Wireshark + Firefox findings cleared | Silent uninstall scripts |
| R2 | Crypto Hardening | SSL/TLS + cipher + SMBv1 findings cleared | Registry toggles + feature disable |
| R3 | Privilege Fixes | Guest/admin + file permission findings cleared | Group policy + chmod scripts |
| R4 | Patching | CVE + OS update findings cleared | Registry fix, apt upgrade, OpenSSL build |
Scheduled authenticated scans on a recurring cycle (weekly for critical assets, monthly for standard). Each scan generates a diff report against the previous baseline, highlighting new findings, recurring issues, and successfully maintained remediations.
| MTTR | Mean Time to Remediate — by severity |
| SLA Compliance | % of findings remediated within SLA window |
| Recurrence Rate | Previously fixed findings that reappear |
| Patch Compliance | % of systems at current patch baseline |
| Exception Tracking | Accepted risks with defined expiry dates |
| Tool | Role | Category |
|---|---|---|
| Tenable VM | Cloud vulnerability management console — scan orchestration and reporting | Scanner |
| Nessus (Azure VM) | Distributed scan engine — credentialed scanning of targets | Scanner |
| Microsoft Azure | Cloud infrastructure — scan engine and target VM hosting | Infrastructure |
| Windows Server 2019 | Target OS — intentionally misconfigured for scan findings | Target |
| Ubuntu Linux | Target OS — file permission and service vulnerabilities | Target |
| PowerShell 5.1 | Windows remediation scripting — registry, services, features | Remediation |
| Bash | Linux remediation scripting — permissions, packages, services | Remediation |
The gap between credentialed and non-credentialed scan results was substantial. Local privilege issues, file permission weaknesses, and registry misconfigurations are invisible to network-only scans — yet these are often the findings that matter most for lateral movement.
Without rescan verification, "remediated" just means "we ran a script and hope it worked." Two of four remediation rounds required follow-up adjustments that would have been missed without independent validation.
Removing two unnecessary applications in Round 1 eliminated more findings than the full OS patching cycle in Round 4. Attack surface reduction is the highest-leverage remediation category — and it requires no patching windows or change control risk.
A remediation that works once on one host has limited value. Scripted, parameterized remediations with toggle capability can be deployed across hundreds of systems in a maintenance window — and reversed if something breaks.
AUTOMATION
Integrate Tenable API exports with a remediation orchestration pipeline — automatically map new findings to existing scripts and generate deployment packages.
COMPLIANCE
Map scan findings to CIS Benchmark controls and NIST 800-53 requirements to demonstrate compliance posture alongside vulnerability status.
REPORTING
Build an automated dashboard using Tenable API data — trend lines for MTTR, SLA compliance tracking, and executive-ready risk reduction visualizations.
EXPANSION
Extend the remediation library to cover Linux-specific hardening (SSH configuration, kernel parameters, auditd rules) and cloud-native misconfiguration findings.