CWE-589 Variante Incompleto

Call to Non-ubiquitous API

This vulnerability occurs when software relies on an operating system function that isn't available on all versions of the target platform. This can cause crashes, unexpected behavior, or security…

Definição

What is CWE-589?

This vulnerability occurs when software relies on an operating system function that isn't available on all versions of the target platform. This can cause crashes, unexpected behavior, or security failures when the software runs in an environment where the API is missing.
Operating systems evolve, and security-critical APIs are not universally present. Functions introduced in newer OS versions will be absent in older ones, while deprecated functions may be removed entirely. If your application unconditionally calls these non-ubiquitous APIs, it can lead to portability issues, sudden crashes (denial of service), or inconsistent security enforcement across different user environments. To avoid this, developers should proactively check for API availability at runtime or during compilation, using feature detection or version checks. Alternatively, provide fallback mechanisms or clear minimum system requirements. Relying on deprecated security APIs is especially risky, as they are often phased out due to known weaknesses, leaving your application vulnerable even on platforms where they still exist.
Impacto no mundo real

Real-world CVEs caused by CWE-589

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

    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-589

  • Implementation Always test your code on any platform on which it is targeted to run on.
  • Testing Test your code on the newest and oldest platform on which it is targeted to run on.
  • Testing Develop a system to test for API functions that are not portable.
Sinais de deteção

How to detect CWE-589

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.)

CWE-589

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-589?

This vulnerability occurs when software relies on an operating system function that isn't available on all versions of the target platform. This can cause crashes, unexpected behavior, or security failures when the software runs in an environment where the API is missing.

Qual a gravidade do CWE-589?

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-589?

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

Como posso prevenir o CWE-589?

Always test your code on any platform on which it is targeted to run on. Test your code on the newest and oldest platform on which it is targeted to run on.

Como é que o Plexicus deteta e corrige o CWE-589?

O motor SAST do Plexicus correlaciona a assinatura de fluxo de dados do CWE-589 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-589?

A MITRE publica a definição canónica em https://cwe.mitre.org/data/definitions/589.html. Pode também consultar a documentação da OWASP e do NIST para orientações adjacentes.

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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