CWE-913 Classe Incompleto

Improper Control of Dynamically-Managed Code Resources

This vulnerability occurs when an application fails to properly secure access to code resources that can be created or altered at runtime, such as variables, functions, or objects.

Definição

What is CWE-913?

This vulnerability occurs when an application fails to properly secure access to code resources that can be created or altered at runtime, such as variables, functions, or objects.
Many modern programming languages provide powerful features for dynamic code manipulation, allowing developers to generate or modify code, objects, and functions while the application is running. While these capabilities offer great flexibility and can speed up development, they introduce significant risk if an attacker can influence what gets created or changed. Without strict controls, an attacker could inject malicious logic, alter critical data structures, or bypass security checks by manipulating these dynamic resources. To prevent this, developers must implement strong validation, enforce strict access controls, and avoid using user input directly in dynamic code operations.
Impacto no mundo real

Real-world CVEs caused by CWE-913

  • CVE-2022-2054

    Python compiler uses eval() to execute malicious strings as Python code.

  • CVE-2018-1000613

    Cryptography API uses unsafe reflection when deserializing a private key

  • CVE-2015-8103

    Deserialization issue in commonly-used Java library allows remote execution.

  • CVE-2006-7079

    Chain: extract used for register_globals compatibility layer, enables path traversal (CWE-22)

  • CVE-2012-2055

    Source version control product allows modification of trusted key using mass assignment.

Como os atacantes a exploram

Trajeto do atacante passo a passo

  1. 1

    Identificar um caminho de código que trata input não confiável sem validação.

  2. 2

    Criar um payload que explora o comportamento inseguro — injeção, traversal, overflow ou abuso de lógica.

  3. 3

    Entregar o payload através de um pedido normal e observar a reação da aplicação.

  4. 4

    Iterar até que a resposta exponha dados, execute código do atacante ou escale privilégios.

Exemplo de código vulnerável

Vulnerable pseudo

A MITRE não publicou um exemplo de código para este CWE. O padrão abaixo é ilustrativo — consulte os Recursos para referências canónicas.

Vulnerável pseudo 
// Example pattern — see MITRE for the canonical references.
function handleRequest(input) {
  // Untrusted input flows directly into the sensitive sink.
  return executeUnsafe(input);
}
Exemplo de código seguro

Secure pseudo

Seguro pseudo 
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}
What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Lista de verificação de prevenção

How to prevent CWE-913

  • Implementation For any externally-influenced input, check the input against an allowlist of acceptable values.
  • Implementation / Architecture and Design Refactor the code so that it does not need to be dynamically managed.
Sinais de deteção

How to detect CWE-913

Fuzzing High

Fuzz testing (fuzzing) is a powerful technique for generating large numbers of diverse inputs - either randomly or algorithmically - and dynamically invoking the code with those inputs. Even with random inputs, it is often capable of generating unexpected results such as crashes, memory corruption, or resource consumption. Fuzzing effectively produces repeatable test cases that clearly indicate bugs, which helps developers to diagnose the issues.

Correção automática do Plexicus

O Plexicus deteta automaticamente o CWE-913 e abre um PR de correção em menos de 60 segundos.

O Codex Remedium analisa cada commit, identifica esta fraqueza exata e entrega um pull request pronto para revisão com o patch. Sem tickets. Sem transferências.

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Perguntas frequentes

Frequently asked questions

O que é o CWE-913?

This vulnerability occurs when an application fails to properly secure access to code resources that can be created or altered at runtime, such as variables, functions, or objects.

Qual a gravidade do CWE-913?

A MITRE não publicou uma classificação de probabilidade de exploração para esta fraqueza. Trate-a como impacto médio até o seu modelo de ameaças provar o contrário.

Que linguagens ou plataformas são afetadas pelo CWE-913?

A MITRE não especificou as plataformas afetadas por este CWE — pode aplicar-se à maioria das stacks de aplicações.

Como posso prevenir o CWE-913?

For any externally-influenced input, check the input against an allowlist of acceptable values. Refactor the code so that it does not need to be dynamically managed.

Como é que o Plexicus deteta e corrige o CWE-913?

O motor SAST do Plexicus correlaciona a assinatura de fluxo de dados do CWE-913 em cada commit. Quando é encontrada uma correspondência, o nosso agente Codex Remedium abre um PR de correção com o código corrigido, testes e um resumo de uma linha para o revisor.

Onde posso saber mais sobre o CWE-913?

A MITRE publica a definição canónica em https://cwe.mitre.org/data/definitions/913.html. Pode também consultar a documentação da OWASP e do NIST para orientações adjacentes.

Fraquezas relacionadas

Weaknesses related to CWE-913

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Reliance on Component That is Not Updateable

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Information Loss or Omission

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Uncontrolled Resource Consumption

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Improper Resource Shutdown or Release

This vulnerability occurs when a program fails to properly close or release a system resource—like a file handle, database connection, or…

Recursos

Further reading

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