CWE-1177 Classe Incomplet

Use of Prohibited Code

This vulnerability occurs when software incorporates a function, library, or third-party component that has been explicitly banned by the development team or the customer.

Définition

What is CWE-1177?

This vulnerability occurs when software incorporates a function, library, or third-party component that has been explicitly banned by the development team or the customer.
Development teams or clients often create lists of prohibited code for critical reasons. These bans can stem from known security flaws, components that are notoriously hard to use safely, licensing conflicts, export control restrictions, reliance on obsolete or unmaintained code, or internal plans to phase out certain technologies. Ignoring these prohibitions directly introduces the specific risks the ban was meant to prevent. Using banned functions or libraries increases security risk and maintenance costs. These components often have inherent weaknesses that can lead to exploits, and they may force developers to write complex, error-prone workarounds. Furthermore, they can create technical debt through compatibility issues, legal problems from license violations, and increased support overhead for code that the team has officially decided not to support.
Impact réel

Real-world CVEs caused by CWE-1177

  • CVE-2007-1470

    Library has multiple buffer overflows using sprintf() and strcpy()

  • CVE-2007-4004

    FTP client uses inherently insecure gets() function and is setuid root on some systems, allowing buffer overflow

Comment les attaquants l'exploitent

Parcours de l'attaquant étape par étape

  1. 1

    The code below calls the gets() function to read in data from the command line.

  2. 2

    However, gets() is inherently unsafe, because it copies all input from STDIN to the buffer without checking size. This allows the user to provide a string that is larger than the buffer size, resulting in an overflow condition.

  3. 3

    The following code attempts to create a local copy of a buffer to perform some manipulations to the data.

  4. 4

    However, the programmer does not ensure that the size of the data pointed to by string will fit in the local buffer and copies the data with the potentially dangerous strcpy() function. This may result in a buffer overflow condition if an attacker can influence the contents of the string parameter.

Exemple de code vulnérable

Vulnerable C

The code below calls the gets() function to read in data from the command line.

Vulnérable C 
char buf[24];
  	printf("Please enter your name and press <Enter>\n");
  	gets(buf);
  	...
  }
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-1177

  • Architecture Use safe-by-default frameworks and APIs that prevent the unsafe pattern from being expressible.
  • Implementation Validate input at trust boundaries; use allowlists, not denylists.
  • Implementation Apply the principle of least privilege to credentials, file paths, and runtime permissions.
  • Testing Cover this weakness in CI: SAST rules + targeted unit tests for the data flow.
  • Operation Monitor logs for the runtime signals listed in the next section.
Signaux de détection

How to detect CWE-1177

SAST High

Exécuter une analyse statique (SAST) sur le code source à la recherche du motif non sécurisé dans le flux de données.

DAST Moderate

Exécuter des tests de sécurité applicative dynamique (DAST) contre le point de terminaison en ligne.

Runtime Moderate

Surveiller les journaux runtime pour détecter des traces d'exception inhabituelles, des entrées malformées ou des tentatives de contournement d'autorisation.

Code review Moderate

Revue de code : signaler tout nouveau code qui traite les entrées de cette surface sans utiliser les helpers du framework validés.

Correction automatique Plexicus

Plexicus détecte automatiquement CWE-1177 et ouvre une PR de correction en moins de 60 secondes.

Codex Remedium analyse chaque commit, identifie cette faiblesse précise et livre une pull request prête à être relue avec le correctif. Pas de tickets. Pas de transferts.

Obtenir une démo Essayer Plexicus gratuitement
Questions fréquentes

Frequently asked questions

Qu'est-ce que CWE-1177 ?

This vulnerability occurs when software incorporates a function, library, or third-party component that has been explicitly banned by the development team or the customer.

Quelle est la gravité de CWE-1177 ?

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-1177 ?

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-1177 ?

Use safe-by-default frameworks, validate untrusted input at trust boundaries, and apply the principle of least privilege. Cover the data-flow signature in CI with SAST.

Comment Plexicus détecte et corrige CWE-1177 ?

Le moteur SAST de Plexicus reconnaît la signature de flux de données de CWE-1177 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-1177 ?

MITRE publie la définition canonique à https://cwe.mitre.org/data/definitions/1177.html. Vous pouvez également consulter la documentation OWASP et NIST pour des conseils adjacents.

Faiblesses associées

Weaknesses related to CWE-1177

CWE-710 Parent

Improper Adherence to Coding Standards

This weakness occurs when developers don't consistently follow established coding standards and best practices, which can introduce…

CWE-1041 Frère

Use of Redundant Code

This weakness occurs when a codebase contains identical or nearly identical logic duplicated across multiple functions, methods, or…

CWE-1044 Frère

Architecture with Number of Horizontal Layers Outside of Expected Range

This occurs when a software system is built with either too many or too few distinct architectural layers, falling outside a recommended…

CWE-1048 Frère

Invokable Control Element with Large Number of Outward Calls

This weakness occurs when a single function, method, or callable code block makes an excessively high number of calls to other objects or…

CWE-1059 Frère

Insufficient Technical Documentation

This weakness occurs when a software or hardware product lacks comprehensive technical documentation. Missing or incomplete details about…

CWE-1061 Frère

Insufficient Encapsulation

This weakness occurs when a software component exposes too much of its internal workings, such as data structures or implementation logic.…

CWE-1065 Frère

Runtime Resource Management Control Element in a Component Built to Run on Application Servers

This weakness occurs when an application built to run on a managed application server bypasses the server's high-level APIs and instead…

CWE-1066 Frère

Missing Serialization Control Element

This weakness occurs when a class or data structure is marked as serializable but lacks the required control methods to properly handle…

CWE-1068 Frère

Inconsistency Between Implementation and Documented Design

This weakness occurs when the actual code implementation deviates from the intended design described in its official documentation,…

Ressources

Further reading

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