CWE-15 Base Incompleto

External Control of System or Configuration Setting

This vulnerability occurs when an application allows users to directly modify critical system settings or configuration values from an external source.

Definição

What is CWE-15?

This vulnerability occurs when an application allows users to directly modify critical system settings or configuration values from an external source.
When system settings like file paths, feature flags, or environment variables can be controlled by an external user, it breaks the fundamental trust between the application and its configuration. Attackers can exploit this to disrupt services, bypass security controls, or force the application to execute unintended and potentially malicious actions, leading to data loss or system compromise. Preventing this requires rigorous validation of all configuration inputs and enforcing strict separation between user data and system controls. While SAST tools can catch the pattern, Plexicus uses AI to analyze the data flow and suggest the precise code fix—such as implementing allowlists or moving configurations to secure, internal sources—saving hours of manual remediation work across your codebase.
Impacto no mundo real

Real-world CVEs caused by CWE-15

Ainda não há referências CVE públicas associadas a este CWE no catálogo da MITRE.

Como os atacantes a exploram

Trajeto do atacante passo a passo

  1. 1

    The following C code accepts a number as one of its command line parameters and sets it as the host ID of the current machine.

  2. 2

    Although a process must be privileged to successfully invoke sethostid(), unprivileged users may be able to invoke the program. The code in this example allows user input to directly control the value of a system setting. If an attacker provides a malicious value for host ID, the attacker can misidentify the affected machine on the network or cause other unintended behavior.

  3. 3

    The following Java code snippet reads a string from an HttpServletRequest and sets it as the active catalog for a database Connection.

  4. 4

    In this example, an attacker could cause an error by providing a nonexistent catalog name or connect to an unauthorized portion of the database.

Exemplo de código vulnerável

Vulnerable C

The following C code accepts a number as one of its command line parameters and sets it as the host ID of the current machine.

Vulnerável C 
...
  sethostid(argv[1]);
  ...
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-15

  • Architecture and Design Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
  • Implementation / Architecture and Design Because setting manipulation covers a diverse set of functions, any attempt at illustrating it will inevitably be incomplete. Rather than searching for a tight-knit relationship between the functions addressed in the setting manipulation category, take a step back and consider the sorts of system values that an attacker should not be allowed to control.
  • Implementation / Architecture and Design In general, do not allow user-provided or otherwise untrusted data to control sensitive values. The leverage that an attacker gains by controlling these values is not always immediately obvious, but do not underestimate the creativity of the attacker.
Sinais de deteção

How to detect CWE-15

Automated Static Analysis High

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

Correção automática do Plexicus

O Plexicus deteta automaticamente o CWE-15 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-15?

This vulnerability occurs when an application allows users to directly modify critical system settings or configuration values from an external source.

Qual a gravidade do CWE-15?

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-15?

MITRE lists the following affected platforms: Not Technology-Specific, ICS/OT.

Como posso prevenir o CWE-15?

Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to…

Como é que o Plexicus deteta e corrige o CWE-15?

O motor SAST do Plexicus correlaciona a assinatura de fluxo de dados do CWE-15 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-15?

A MITRE publica a definição canónica em https://cwe.mitre.org/data/definitions/15.html. Pode também consultar a documentação da OWASP e do NIST para orientações adjacentes.

Fraquezas relacionadas

Weaknesses related to CWE-15

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External Control of File Name or Path

This vulnerability occurs when an application uses unvalidated user input to construct file or directory paths for filesystem operations.

Recursos

Further reading

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