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yaklang/401-403-bypass-techniques

Manuel de contournement 401/403. À utiliser lorsque vous rencontrez des réponses d'accès refusé sur des panneaux d'administration, des points de terminaison API ou des chemins restreints. Couvre la manipulation de chemins, la falsification de méthodes HTTP, l'injection d'en-têtes, la rétrogradation de protocole et les outils de contournement automatisés.

Qu'est-ce que 401-403-bypass-techniques ?

Ce playbook (`yaklang/401-403-bypass-techniques`) est conçu pour les développeurs et professionnels de la sécurité qui rencontrent des réponses d'accès refusé (codes 401/403) lors de tests sur des panneaux d'administration, des API ou des chemins restreints. Il offre un ensemble structuré de techniques de contournement, allant de la manipulation de chemins (ex: `..;`, `//`, encodage URL) à la falsification de méthodes HTTP (ex: changer GET en POST), en passant par l'injection d'en-têtes (ex: `X-Forwarded-For`, `X-Original-URL`), la rétrogradation de protocole (HTTP/1.0), et l'utilisation d'outils automatisés (ex: ffuf, Burp Suite). Chaque technique est expliquée avec des exemples concrets en curl ou en requêtes brutes, facilitant la reproduction des tests. Utile pour les pentesters et ingénieurs DevOps qui souhaitent identifier des failles de contrôle d'accès dans divers environnements (applications web, API REST, microservices). Le playbook prend en charge l'exécution via des scripts Yaklang pour une intégration automatisée dans les workflows de sécurité.

Compatible avec~Claude Code~Codex CLI~Cursor
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Documentation

Que fait 401-403-bypass-techniques ?

Manuel de contournement 401/403. À utiliser lorsque vous rencontrez des réponses d'accès refusé sur des panneaux d'administration, des points de terminaison API ou des chemins restreints. Couvre la manipulation de chemins, la falsification de méthodes HTTP, l'injection d'en-têtes, la rétrogradation de protocole et les outils de contournement automatisés.

Techniques de contournement

1. Manipulation de chemins

  • Encodage URL : %2e%2e%2f pour ../, %23 pour #
  • Doublons de slash : //admin, ///admin
  • Séquences de points : ..;/, ..//
  • Paramètres de requête : ?, #, ; pour tronquer le chemin

2. Falsification de méthodes HTTP

  • GET → POST, PUT, DELETE, PATCH
  • OPTIONS pour découvrir les méthodes autorisées
  • Utiliser X-HTTP-Method-Override

3. Injection d'en-têtes

  • X-Forwarded-For: 127.0.0.1
  • X-Originating-IP: 127.0.0.1
  • X-Remote-IP: 127.0.0.1
  • X-Client-IP: 127.0.0.1
  • X-Original-URL: /admin
  • X-Rewrite-URL: /admin

4. Rétrogradation de protocole

  • Utiliser HTTP/1.0 au lieu de HTTP/1.1
  • Exemple : curl --http1.0

5. Outils automatisés

  • ffuf avec listes de chemins : ffuf -w /path/to/wordlist -u http://target.com/FUZZ -fc 401,403
  • Burp Suite avec Intruder pour tester les en-têtes
  • yak avec scripts Yaklang pour automatiser les tests

Exemples de commandes

# Manipulation de chemins
curl -v http://target.com/admin/
curl -v http://target.com/./admin/
curl -v http://target.com//admin/
curl -v "http://target.com/%2e%2e/admin/"

# Injection d'en-têtes
curl -v -H "X-Forwarded-For: 127.0.0.1" http://target.com/admin
curl -v -H "X-Original-URL: /admin" http://target.com/

# Rétrogradation de protocole
curl --http1.0 -v http://target.com/admin

Références

Individual skills in this repo

This repo contains 20 individual skills — each has its own dedicated page.

yaklang/active-directory-acl-abuse

Active Directory ACL abuse playbook. Use when exploiting misconfigured AD permissions including GenericAll, WriteDACL, DCSync rights, shadow credentials, LAPS reading, GPO abuse, and BloodHound-guided attack paths.

yaklang/active-directory-certificate-services

AD Certificate Services attack playbook. Use when targeting misconfigured AD CS for privilege escalation via ESC1-ESC13 template abuse, NTLM relay to enrollment, CA officer abuse, and certificate-based persistence.

yaklang/active-directory-kerberos-attacks

Kerberos attack playbook for Active Directory. Use when targeting AD authentication via AS-REP roasting, Kerberoasting, golden/silver/diamond tickets, delegation abuse, or pass-the-ticket attacks.

yaklang/ai-ml-security

AI/ML security playbook. Use when assessing model supply chain attacks (pickle RCE, poisoned weights), adversarial examples, model poisoning, model stealing, data privacy attacks (membership inference, model inversion), and autonomous agent security risks.

yaklang/android-pentesting-tricks

Android pentesting playbook. Use when testing Android applications for SSL pinning bypass, exported component abuse, WebView vulnerabilities, intent redirection, root detection bypass, tapjacking, and backup extraction during authorized mobile security assessments.

yaklang/anti-debugging-techniques

Anti-debugging detection and bypass playbook. Use when reversing protected binaries that detect debuggers via ptrace, PEB flags, timing checks, or signal/exception handlers on Linux and Windows.

yaklang/api-auth-and-jwt-abuse

API authentication and JWT abuse playbook. Use when testing bearer tokens, API keys, claim trust, header spoofing, rate limits, and API auth boundary weaknesses.

yaklang/api-authorization-and-bola

API authorization and BOLA testing playbook. Use when APIs expose object identifiers, nested resources, hidden writable fields, or weak function-level authorization.

yaklang/api-recon-and-docs

API reconnaissance and documentation review playbook. Use when discovering endpoints, schemas, versions, OpenAPI specs, hidden docs, and surface area for API testing.

yaklang/api-sec

Entry P1 category router for API security. Use when choosing between API recon, authorization, token abuse, and hidden-parameter workflows before any deeper API topic skill.

yaklang/arbitrary-write-to-rce

Arbitrary write to RCE playbook. Use when you have an arbitrary write primitive (from heap exploitation, format string, or OOB write) and need to convert it into code execution by targeting GOT, hooks, _IO_FILE vtable, exit_funcs, TLS_dtor_list, modprobe_path, .fini_array, or C++ vtables.

yaklang/authbypass-authentication-flaws

Authentication bypass testing playbook. Use when assessing login flows, password reset logic, account recovery, MFA bypass, token predictability, brute-force resistance, and session boundary flaws.

yaklang/auth-sec

Entry P1 category router for authentication and authorization. Use when testing login flows, sessions, object authorization, JWT, OAuth, CORS, CSRF, and enterprise SSO weaknesses before any deeper auth topic skill.

yaklang/binary-protection-bypass

Binary protection bypass playbook. Use when identifying and bypassing ASLR, PIE, NX/DEP, stack canary, RELRO, FORTIFY_SOURCE, CET, and MTE protections in ELF binaries to enable exploitation.

yaklang/browser-exploitation-v8

Browser and V8 exploitation playbook. Use when exploiting JavaScript engine vulnerabilities including JIT type confusion, incorrect bounds elimination, and V8 sandbox bypass to achieve renderer RCE and sandbox escape in Chrome/Chromium.

yaklang/business-logic-vuln

Entry P1 category router for business logic testing. Use when workflow abuse, race conditions, pricing flaws, or multi-step state attacks matter more than parser-level input injection.

yaklang/business-logic-vulnerabilities

Business logic vulnerability playbook. Use when reasoning about workflows, race conditions, price manipulation, coupon abuse, state machines, and multi-step authorization gaps.

yaklang/classical-cipher-analysis

Classical cipher analysis playbook. Use when encountering substitution ciphers, Vigenere, transposition, XOR, or encoded text in CTF challenges that requires frequency analysis, Kasiski examination, or known-plaintext cryptanalysis.

yaklang/clickjacking

Clickjacking playbook. Use when testing whether target pages can be framed, whether X-Frame-Options or CSP frame-ancestors are properly configured, and whether UI redress attacks can trigger sensitive actions.

yaklang/cmdi-command-injection

Command injection playbook. Use when user input may reach shell commands, process execution, converters, import pipelines, or blind out-of-band command sinks.

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