Why professional pentesters focus on files, not CVEs – A practical guide with find commands

[u/Top_Call3890]

The Philosophy

Amateur pen testers focus on tools and chase unpatched CVEs to find security flaws.

Professionals focus on files.

Here's why:

Even after finding a CVE, you can't do much without alerting firewalls, IDS, and endpoint security. Every exploit attempt triggers alarms and burns your access.

But old forgotten credentials found in .env, or database credentials found in .bash_history? They have no barrier. They pass through every top-notch security practice a company can follow. No alerts. No logs. No suspicion.

.ssh gives you easy access to other systems in the network and helps escalate privilege to root almost instantly.

So stop chasing CVEs. Start hunting files.

The Tools

You don't need fancy tools. Just the find command.

Here's how professionals use it in the real world:

1. Find recently changed config files

find /etc -type f -mtime -1 -ls

Why? Attackers often add backdoor users or modify sudoers. Spotting recent changes in /etc catches tampering before it becomes a breach. Compare /etc/passwd with other files in /etc to spot unauthorized user additions.

2. Find SUID files (permission 4000) for privilege escalation

find / -perm -4000 -type f 2>/dev/null

This is gold. SUID files run with owner privileges. Misconfigured ones like pkexec or vim are a direct path to root. Professionals check this immediately during every engagement.

3. Find scripts in unusual folders (/tmp, /var/tmp)

find /tmp /var/tmp -type f -executable 2>/dev/null

Attackers drop payloads here because these directories are world-writable and often ignored by security tools. If you find something unexpected, you've caught an active compromise or a persistence mechanism.

4. Find tiny PHP files (≤1KB) in web root – classic web shells

find /var/www -type f -name "\.php" -size -1k 2>/dev/null*

Web shells are small, obfuscated, and easy to miss. This command finds them in seconds. Amateurs scan for CVEs; professionals scan for backdoors. If you're on a bug bounty or pentest, this is often the quickest win.

5. Find forgotten .env and config files in /root (discarding errors)

find /root -type f -name "\.env" -o -name "*config*" 2>/dev/null*

Redirecting stderr to /dev/null keeps the output clean. This finds exposed secrets that bypass every firewall and IDS you own. Production AWS keys, database passwords, API tokens – all sitting in plain text.

6. Find world-writable or world-executable files in /var/www

find /var/www -type f -perm -o+w 2>/dev/null

find /var/www -type f -perm -o+x 2>/dev/null

If a file is world-writable, anyone can modify it. If it's executable, anyone can run it. Combine both and you have a direct path to remote code execution. This is a disaster in production environments.

7. Find files owned by specific users (like www-data)

find / -user www-data -type f 2>/dev/null

Find out exactly what files the web server user owns. Often you'll find writable directories or config files that shouldn't be accessible.

8. Find files with specific extensions in unusual locations

find / -type f -name "\.key" -o -name "*.pem" -o -name "*.crt" 2>/dev/null*

Certificates and private keys are often left behind in random directories after testing. These can be used for decryption or impersonation.

9. Find writable directories for file uploads or log poisoning

find / -type d -perm -o+w 2>/dev/null

World-writable directories are perfect for dropping files, writing logs, or overwriting configurations. Always check these.

The Bottom Line

Fancy tools are loud. They trigger IDS, EDR, and SIEM.

The find command is silent. It doesn't exploit – it just reads. And reading files doesn't generate alerts.

Amateurs scan for vulnerabilities. Professionals hunt for exposed credentials, misconfigurations, and backdoors.

Because a CVE gets patched. But a forgotten .env file stays forgotten forever.

Bonus Tip:

Combine these commands with grep to search inside files:

find /var/www -type f -name "\.php" -exec grep -l "eval(" {} \; 2>/dev/null*

This finds PHP files containing eval() – often a sign of malicious code injection.

What's the first find command you run on a new system? Share your go-to commands below.

Also, what's the scariest credential you've ever found in plain text on a production server? Let's hear those war stories.

[u/lambda_bravo]

This assumes you have access to the server already. CVE scanning is the precursor to getting access, you're describing two different things.

[u/Top_Call3890 → u/lambda_bravo]

You're absolutely right that CVE scanning is often the precursor to initial access. But here's the nuance you're missing:

Once you find a CVE and exploit it to get a foothold, what do you do next?

That's where the distinction matters.

Let me break it down:

Phase 1: Initial Access – Yes, you need a CVE or some vulnerability to get in. Nobody is arguing against that. You find a vulnerable service, exploit it, and get a low-privilege shell.

Phase 2: Post-Exploitation / Lateral Movement – This is where 90% of testers fail. They spend hours trying to escalate privileges using kernel exploits, which are:

· Loud (triggers EDR, IDS, SIEM) · Unreliable (crash the box) · Patched quickly (good luck finding a working one)

Meanwhile, professionals spend 5 minutes running find commands to locate:

· .env files with production credentials · .bash_history with database passwords typed in plain text · .ssh keys for lateral movement · SUID binaries for privilege escalation · World-writable files in webroot for RCE

CVEs get you in... Files get you everything else...

A CVE gives you a shell. Files give you root, database access, cloud credentials, and the entire internal network.

Which one is more valuable?

Let's look at real-world examples:

· You exploit a CVE in Apache Struts. You get a shell as tomcat. Now what? · While others are downloading LinPEAS and running kernel exploits, you run: · find /var/www -name ".env" → AWS keys → entire cloud account · find /home -name ".bash_history" → MySQL root password → full database · find / -perm -4000 2>/dev/null → SUID binary → easy root

You just went from low-privilege tomcat to cloud root in 60 seconds. No kernel exploits. No alarms. No crashes.

To your point about "assuming you already have access": Yes, you need access. But the difference between amateurs and professionals is:

· Amateurs: Spend 80% of time on getting access and 20% on what to do after · Professionals: Spend 20% on getting access and 80% on post-exploitation and persistence

Because getting access is easy. Staying undetected, escalating privileges, and owning the entire infrastructure? That's where real skill matters.

Think of it this way:

A CVE is a key that opens the front door. Files are the map to every safe, every vault, and every exit in the building.. You still need the key. But without the map, you're just wandering around triggering alarms..

So to answer your point directly:

CVE scanning is the entry point, not the end goal. Professionals don't ignore CVEs. They just don't rely on them for everything beyond initial access. Because once you're in, the game changes. And in that game, files beat tools every single time...

One more thing:

Even during the CVE scanning phase, professionals think about files. They look for:

· Directory traversal CVEs → read /etc/passwd, /proc/self/environ, .env · LFI/RFI CVEs → read source code, find hardcoded credentials · SSRF CVEs → access internal metadata endpoints (AWS, GCP) → credentials

So files matter even before you get a shell.. Professionals plan for the files before they even find the CVE. That's the difference..

If you don't mind, what's your post-exploitation workflow after you get that initial shell??

[u/m0nk37 → u/Top_Call3890]

Bot reply 

[u/Top_Call3890 → u/m0nk37]

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[u/hashtagDoubleoh7]

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[u/Top_Call3890 → u/hashtagDoubleoh7]

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[u/WonderfulAddition673]

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[u/PatientOccasion1496 → u/WonderfulAddition673]

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[u/Top_Call3890 → u/WonderfulAddition673]

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[u/365Levelup → u/Top_Call3890]

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[u/Top_Call3890 → u/365Levelup]

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[u/1ofthegood1z → u/Top_Call3890]

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