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yaklang/cors-cross-origin-misconfiguration

Manual de testes de má configuração de CORS. Use ao analisar confiança entre origens, leitura autenticada pelo navegador, reflexão de origem, falhas de política de preflight e acesso baseado em navegador a APIs autenticadas.

O que é cors-cross-origin-misconfiguration?

Esta skill fornece um manual prático para testar e identificar configurações incorretas de CORS (Cross-Origin Resource Sharing) em aplicações web. Ela ajuda desenvolvedores e profissionais de segurança a analisar vulnerabilidades como confiança excessiva entre origens, leitura de dados autenticados pelo navegador de origens diferentes, reflexão de cabeçalho Origin na resposta, bugs na política de requisições preflight e acesso não autorizado a APIs autenticadas via navegador. A skill é compatível com ferramentas como o Claude Code e o Codex, funcionando como um playbook passo a passo. Ao usar esta skill, o agente pode gerar testes e verificações para cada tipo de falha de CORS, ajudando o usuário a compreender os riscos e as correções necessárias.

Funciona com~Claude Code~Codex CLI~Cursor
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Documentação

O que cors-cross-origin-misconfiguration faz?

Manual de testes de má configuração de CORS. Use ao analisar confiança entre origens, leitura autenticada pelo navegador, reflexão de origem, falhas de política de preflight e acesso baseado em navegador a APIs autenticadas.

Tópicos Abordados

  • Confiança entre origens: Verifique se origens não confiáveis têm permissão para acessar recursos.
  • Leitura autenticada pelo navegador: Teste se requisições com credenciais (cookies, tokens) podem ser feitas de origens externas.
  • Reflexão de origem: Identifique se o cabeçalho Access-Control-Allow-Origin reflete dinamicamente o valor do cabeçalho Origin da requisição.
  • Falhas de política de preflight: Teste se a resposta para requisições OPTIONS permite métodos, cabeçalhos ou origens inseguras.
  • Acesso a APIs autenticadas: Verifique se APIs que exigem autenticação podem ser acessadas indevidamente via navegador.

Como Usar

  1. Identifique endpoints que podem estar vulneráveis a má configuração de CORS.
  2. Utilize um proxy interceptador (como Burp Suite) ou ferramentas de linha de comando (como curl) para enviar requisições com cabeçalhos Origin personalizados.
  3. Analise as respostas do servidor para verificar a presença e os valores dos cabeçalhos Access-Control-Allow-Origin, Access-Control-Allow-Credentials, Access-Control-Allow-Methods e Access-Control-Allow-Headers.
  4. Aplique os testes descritos neste manual para cada cenário.

Exemplos de Testes

Teste de Reflexão de Origem

curl -H "Origin: https://evil.com" -H "User-Agent: Mozilla/5.0" --verbose https://api.exemplo.com/recurso
  • Verifique se a resposta contém Access-Control-Allow-Origin: https://evil.com. Caso sim, a configuração está vulnerável.

Teste de Credenciais

curl -H "Origin: https://evil.com" -H "Cookie: session=abc123" --verbose https://api.exemplo.com/dados-sensiveis
  • Se a resposta incluir Access-Control-Allow-Credentials: true e Access-Control-Allow-Origin: https://evil.com, o servidor permite leitura autenticada de origens não confiáveis.

Referências

Nota: Este manual é destinado a fins educacionais e testes autorizados. Use com responsabilidade.

Individual skills in this repo

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

yaklang/401-403-bypass-techniques

401/403 bypass playbook. Use when encountering access-denied responses on admin panels, API endpoints, or restricted paths. Covers path manipulation, HTTP method tampering, header injection, protocol downgrade, and automated bypass tools.

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.

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