> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/pt-br/web/business-logic/inconsistent-handling-of-exceptional-input.md).
# Tratamento inconsistente de entrada excepcional
Notas sobre tratamento inconsistente de entrada excepcional para os laboratórios do PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payload, validação no Burp Suite e contexto de remediação.
### Tratamento inconsistente de entrada excepcional
**Descrição do laboratório**
Este laboratório mostra uma validação deficiente das entradas do usuário no processo de registro. Essa falha lógica permite acesso a recursos administrativos normalmente reservados aos funcionários. / Objetivo: acessar o painel de administração e excluir usuário **carlos**.
**Observação inicial**
Ao se registrar, um e-mail de validação é enviado para o endereço fornecido. / O servidor operacional recebe \*\*todos os e-mails\*\* associados ao domínio e a seus subdomínios:
```bash
@exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
Assim, qualquer endereço criado com esse domínio ou seus subdomínios é admissível.
**Comportamento anormal identificado**
Ao criar um endereço de e-mail contendo uma quantidade muito grande de caracteres antes do `@` símbolo, constatamos que o campo \*\*
{% code overflow="wrap" %}
```bash
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
{% endcode %}
Essa limitação causa uma inconsistência entre o valor realmente armazenado e o exibido ou usado para verificações de segurança.
**Funcionamento da falha**
O objetivo é forçar a truncagem para que o e-mail registrado termine exatamente com o `dontwannacry.com` área de confiança.
Verificação de comprimento:
{% code overflow="wrap" %}
```bash
eecho -n "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@dontwannacry.com" | wc -c
```
{% endcode %}
Uma vez alcançados os 255 caracteres, o endereço final é construído desta forma:
{% code overflow="wrap" %}
```bash
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@dontwannacry.com.exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
{% endcode %}
O servidor operacional recebe o e-mail sem problemas, pois aceita todos os subdomínios.
A aplicação, após a truncagem, interpreta o endereço como pertencente ao `dontwannacry.com` domínio.
A conta é considerada interna ou confiável. / Uma vez conectado, o acesso ao **Painel de Administração** é permitido sem controle adicional.
---
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