> 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-management-of-exceptional-entries.md).
# Gerenciamento inconsistente de entradas excepcionais
Notas sobre gerenciamento inconsistente de entradas excepcionais 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 fraca das entradas do usuário no processo de registro. Essa falha lógica permite acesso a recursos administrativos normalmente reservados a funcionários. / Objetivo: acessar o painel de administração e excluir usuário **carlos**.
**Observação inicial**
Após o registro, um e-mail de validação é enviado para o endereço fornecido. / O servidor em operação recebe \*\*todos os e-mails\*\* associados ao domínio e aos 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 um número muito grande de caracteres antes do `@` símbolo, descobrimos que o campo \*\*
{% code overflow="wrap" %}
```bash
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
{% endcode %}
Esse limite causa uma inconsistência entre o valor realmente armazenado e o exibido ou usado em verificações de segurança.
**Funcionamento da falha**
O objetivo é forçar a truncagem para que o e-mail cadastrado termine exatamente com o `dontwannacry.com` área de confiança.
Verificação de comprimento:
{% code overflow="wrap" %}
```bash
eecho -n "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@dontwannacry.com" | wc -c
```
{% endcode %}
Quando os 255 caracteres são alcançados, o endereço final é construído desta forma:
{% code overflow="wrap" %}
```bash
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@dontwannacry.com.exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
{% endcode %}
O servidor em operação recebe o e-mail normalmente, 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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