CWE-589 Variante Incomplet

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…

Définition

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.
Impact réel

Real-world CVEs caused by CWE-589

Aucune référence CVE publique n'est liée à ce CWE dans le catalogue MITRE pour le moment.

Comment les attaquants l'exploitent

Parcours de l'attaquant étape par étape

  1. 1

    Identifier un chemin de code qui traite des entrées non fiables sans validation.

  2. 2

    Élaborer une charge utile qui exploite le comportement non sécurisé — injection, traversal, débordement ou abus de logique.

  3. 3

    Délivrer la charge utile via une requête normale et observer la réaction de l'application.

  4. 4

    Itérer jusqu'à ce que la réponse divulgue des données, exécute le code de l'attaquant ou élève les privilèges.

Exemple de code vulnérable

Vulnerable pseudo

MITRE n'a pas publié d'exemple de code pour ce CWE. Le motif ci-dessous est illustratif — voir Ressources pour les références canoniques.

Vulnérable pseudo
// Example pattern — see MITRE for the canonical references.
function handleRequest(input) {
  // Untrusted input flows directly into the sensitive sink.
  return executeUnsafe(input);
}
Exemple de code sécurisé

Secure pseudo

Sécurisé 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.
Liste de contrôle de prévention

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.
Signaux de détection

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.

Questions fréquentes

Frequently asked questions

Qu'est-ce que 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.

Quelle est la gravité de CWE-589 ?

MITRE n'a pas publié de note de probabilité d'exploitation pour cette faiblesse. Traitez-la comme un impact moyen jusqu'à ce que votre modèle de menace prouve le contraire.

Quels langages ou plateformes sont affectés par CWE-589 ?

MITRE n'a pas spécifié les plateformes affectées pour ce CWE — il peut s'appliquer à la plupart des stacks applicatives.

Comment puis-je prévenir 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.

Comment Plexicus détecte et corrige CWE-589 ?

Le moteur SAST de Plexicus reconnaît la signature de flux de données de CWE-589 à chaque commit. Lorsqu'une correspondance est trouvée, notre agent Codex Remedium ouvre une PR de correction avec le code corrigé, les tests et un résumé d'une ligne pour le relecteur.

Où puis-je en savoir plus sur CWE-589 ?

MITRE publie la définition canonique à https://cwe.mitre.org/data/definitions/589.html. Vous pouvez également consulter la documentation OWASP et NIST pour des conseils adjacents.

Prêt à valider l'essentiel ?

Prêt à valider ce qui compte.

Plexicus est Proof-Driven AppSec : findings validés, compréhension contextuelle et remédiation relue — ancrée dans la preuve, scopée avec vous.

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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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