Payloads & Wordlists
Relevant source files
The following files were used as context for generating this wiki page:
OWASP Nettacker utilizes a modular architecture where payloads and wordlists serve as the core data components for automated penetration testing activities. These assets enable the framework to perform reconnaissance, vulnerability assessments, and credential brute-force testing across various protocols and platforms.
The system supports both built-in static assets, such as common password lists and browser user agents, and dynamic payload generation defined within YAML-based vulnerability modules. This allows for flexible targeting of specific vulnerabilities (CVEs) or general misconfigurations like HTTP CORS issues or directory traversal.
Sources: README.md:27-40, nettacker/lib/payloads/readme.md:3-12
Payload Architecture and Integration
Payloads in Nettacker are primarily integrated through modular YAML definitions that specify the logic for vulnerability detection. Each module defines its own set of payloads, often utilizing a "fuzzer" component to inject variables such as target IPs, schemas, and ports into request templates.
Dynamic Payload Generation
Modules use the nettacker_fuzzer to construct complex payloads dynamically. This involves defining input_format strings and providing sets of data (like schemas or ports) that the engine iterates through during execution. Some modules also utilize interceptors to transform data before transmission, such as generating MD5 hashes for specific request parameters.
The diagram shows how a YAML module definition flows through the fuzzer to create final requests.
Sources: nettacker/modules/vuln/wp_plugin_cve_2021_38314.yaml:21-45, nettacker/modules/vuln/http_cors.yaml:15-38
Wordlists and Static Assets
Static wordlists are stored within the lib/payloads/ directory and are categorized by their intended use case. These wordlists provide the basis for brute-force attacks and service discovery.
Key Wordlist Categories
| Category | Description | Primary Sources |
|---|---|---|
| Passwords | Lists of common credentials used for brute-forcing services like SSH, FTP, and HTTP Auth. | SecLists (10-million-password-list-top-1000) |
| User-Agents | Browser strings used to evade detection or simulate specific client environments. | Web Browser User agents |
| Directory | Wordlists specifically for discovering hidden paths and sensitive files on web servers. | dir_wordlist.txt |
| User-defined | Custom wordlists provided by the user via CLI or Web UI. | User input via -L or --passwords |
Sources: nettacker/lib/payloads/readme.md:3-12, nettacker/locale/en.yaml:122-125, nettacker/web/static/index.html:255-265
Module Payload Logic
Vulnerability modules define payloads as distinct "steps." Each step includes the HTTP method, headers, and the specific payload to be delivered.
CVE-Specific Payloads
For specific vulnerabilities like CVE-2025-55182 (React2Shell), the payload involves complex multipart/form-data structures designed to exploit server-side deserialization.
Sources: nettacker/modules/vuln/nextjs_cve_2025_55182.yaml:31-62
Fuzzing and Interceptors
Interceptors allow the payload engine to modify input data on the fly. For instance, in wp_plugin_cve_2021_38314.yaml, the generate_and_replace_md5 interceptor takes a target URL and converts it into an MD5 hash required by the vulnerable endpoint.
Sources: nettacker/modules/vuln/wp_plugin_cve_2021_38314.yaml:33-40
User Configuration and Input
The Web UI and CLI provide interfaces for users to override default wordlists or provide custom payload data.
Web UI Payload Selection
In the "Advanced" scan options of the Web UI, users can manually input:
- Usernames: Separated by commas or new lines.
- Passwords: Specific credentials for the current scan session.
- HTTP Headers: Custom headers (e.g.,
Header: Value) to be included in all outgoing requests.
Sources: nettacker/web/static/index.html:245-265
Engine Logic for Input
The framework validates these inputs to ensure they meet technical requirements (e.g., ports must be integers) before they are passed to the module's execution thread.
Sources: nettacker/locale/en.yaml:45-50, nettacker/locale/en.yaml:94-96
Summary
Payloads and Wordlists in OWASP Nettacker represent a hybrid system of static reference files and dynamic, logic-driven fuzzer templates. This combination allows the tool to remain versatile, supporting generic reconnaissance through extensive wordlists while enabling surgical exploitation of specific vulnerabilities via modular YAML definitions. User-defined inputs further extend this flexibility, allowing for targeted testing against authenticated environments.