An expert playbook for identifying and exploiting CRLF injection vulnerabilities.
Install
mkdir -p .claude/skills/crlf-injection && curl -L -o skill.zip "https://agentskills.codes/api/skills/download/17048" && unzip -o skill.zip -d .claude/skills/crlf-injection && rm skill.zipInstalls to .claude/skills/crlf-injection
Activation
This is the description your AI agent reads to decide when to run this skill — the better it matches your request, the more reliably it fires.
>-Key capabilities
- →Detect CRLF injection using basic probes
- →Identify response body injection via double CRLF
- →Exploit session fixation through Set-Cookie injection
- →Achieve XSS via response body injection
- →Perform cache poisoning by injecting headers/body
How it works
The skill identifies vulnerabilities where unsanitized user input containing CRLF characters can split HTTP headers or inject content into the response body.
Inputs & outputs
When to use crlf-injection
- →Test for CRLF injection
- →Check for HTTP response splitting
- →Validate header input sanitation
- →Assess cache poisoning risks
About crlf-injection
Details the process of identifying CRLF injection, including how to probe for header splitting and body injection. It provides guidance on detection techniques and exploitation scenarios like session fixation and cache poisoning.
>-
When not to use it
- →When user input does not reach HTTP response headers, Location redirects, Set-Cookie values, or log files
- →When carriage-return/line-feed characters cannot split or inject content
Limitations
- →The skill relies on user input being reflected in specific HTTP contexts
- →The skill's effectiveness depends on the server's handling of CRLF characters
- →The skill does not bypass all filtering mechanisms
How it compares
This skill provides a structured playbook for detecting and exploiting CRLF injection, unlike general vulnerability scanning.
Compared to similar skills
crlf-injection side by side with the closest alternatives in the catalog.
| Skill | Installs | Updated | Safety | Difficulty |
|---|---|---|---|---|
| crlf-injection (this skill) | 0 | 5mo | No flags | Advanced |
| reverse-engineering-tools | 73 | 5mo | No flags | Advanced |
| game-hacking-techniques | 42 | 4mo | No flags | Advanced |
| solidity-security | 15 | 4mo | No flags | Intermediate |
Try saying
Example prompts that trigger this skill in your AI assistant.
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