CWE-912 Classe Incompleto

Hidden Functionality

Hidden functionality refers to undocumented features, commands, or code within a product that are not part of its official specification and are not obvious to users or administrators.

Definição

What is CWE-912?

Hidden functionality refers to undocumented features, commands, or code within a product that are not part of its official specification and are not obvious to users or administrators.
This hidden code can take many forms, from seemingly harmless developer shortcuts like hard-coded backdoor accounts to intentionally malicious logic or non-essential 'Easter eggs.' Regardless of intent, this undocumented behavior creates a security blind spot, as it is not accounted for during standard security reviews, testing, or user training. From an attack perspective, hidden functionality expands the product's attack surface, exposing potential weaknesses that attackers can discover and exploit. Even if not easily accessible through normal use, attackers can often trigger this code by manipulating the application's control flow, leading to unauthorized access, data breaches, or system compromise.
Impacto no mundo real

Real-world CVEs caused by CWE-912

  • Chain: a digital asset management program has an undisclosed backdoor in the legacy version of a PHP script (CWE-912) that could allow an unauthenticated user to export metadata (CWE-306)

  • A wireless access point manual specifies that the only method of configuration is via web interface (CWE-1059), but there is an undisclosed telnet server that was activated by default (CWE-912).

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-912

  • Installation Always verify the integrity of the product that is being installed.
  • Testing Conduct a code coverage analysis using live testing, then closely inspect any code that is not covered.
Sinais de deteção

How to detect CWE-912

SAST High

Executar análise estática (SAST) na base de código à procura do padrão inseguro no fluxo de dados.

DAST Moderate

Executar testes dinâmicos de segurança de aplicações (DAST) contra o endpoint em execução.

Runtime Moderate

Monitorizar os registos em tempo de execução para traços de exceção invulgares, input malformado ou tentativas de contornar a autorização.

Code review Moderate

Revisão de código: sinalizar qualquer novo código que trate input desta superfície sem usar os ajudantes validados do framework.

CWE-912

Don't catalog this weakness. Prove it's reachable.

Plexicus turns CWE catalogs into evidence: every CWE-pattern is matched against your real code graph, reach is proven on a sandbox clone, and verified findings ship as reviewed PRs.

Perguntas frequentes

Frequently asked questions

O que é o CWE-912?

Hidden functionality refers to undocumented features, commands, or code within a product that are not part of its official specification and are not obvious to users or administrators.

Qual a gravidade do CWE-912?

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-912?

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

Como posso prevenir o CWE-912?

Always verify the integrity of the product that is being installed. Conduct a code coverage analysis using live testing, then closely inspect any code that is not covered.

Como é que o Plexicus deteta e corrige o CWE-912?

O motor SAST do Plexicus correlaciona a assinatura de fluxo de dados do CWE-912 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-912?

A MITRE publica a definição canónica em https://cwe.mitre.org/data/definitions/912.html. Pode também consultar a documentação da OWASP e do NIST para orientações adjacentes.

Fraquezas relacionadas

Weaknesses related to CWE-912

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Expected Behavior Violation

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UI Discrepancy for Security Feature

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CWE-451 Irmão

User Interface (UI) Misrepresentation of Critical Information

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CWE-1242 Filho

Inclusion of Undocumented Features or Chicken Bits

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Embedded Malicious Code

This vulnerability occurs when an application or codebase contains intentionally harmful code inserted by a developer or third party.

Pronto para validar o que importa?

Pronto para validar o que importa.

O Plexicus é Proof-Driven AppSec: achados validados, compreensão contextual e remediação revisada — ancorada em evidência, escopada com você.

Qualificação

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SAMPLE HANDOVER · ILLUSTRATIVE

Sample evidence handover

A trimmed view of what your team receives at the end of an AI Swarm Pentest engagement. Real engagements include full technical evidence, executive narrative, and a remediation plan.

VALIDATED FINDING Evidence attached

Server-Side Request Forgery in webhooks/receiver

demo-project/sample-app · src/webhooks/receiver.py:42

SeverityHigh CVSS 3.18.6 Priority79 Confirmedvia replay

Untrusted caller-supplied URLs reach an internal egress without an allowlist. Replayed in a sandbox against a fresh authorized target — the same control was validated to fail twice.

REVIEWER-READY REMEDIATION Merge-ready PR

Validate the target URL against an allowlist of permitted hostnames. Reject private/internal IP ranges. Enforce HTTPS only.

plexicus/remediation/webhooks-ssrf 3 changed · 0 new files
42resp = requests.get(target_url)
42+if not is_allowed_host(target_url):
43+  raise WebhookRejected(target_url)
44+resp = requests.get(target_url, timeout=5)
Every engagement hands over:
  • Executive briefing
  • Validated findings list
  • Merge-ready PRs
  • Compliance mapping (NIS2 · DORA · CRA)
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