CWE-1177 Clase Incompleto

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.

Definición

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.
Impacto en el mundo real

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

Cómo lo explotan los atacantes

Ruta del atacante paso a paso

  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.

Ejemplo de código vulnerable

Vulnerable C

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

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

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.
Señales de detección

How to detect CWE-1177

SAST High

Ejecuta análisis estático (SAST) sobre el código buscando el patrón inseguro en el flujo de datos.

DAST Moderate

Ejecuta pruebas dinámicas de seguridad de aplicaciones (DAST) contra el endpoint en vivo.

Runtime Moderate

Vigila los logs en tiempo de ejecución para detectar trazas de excepción inusuales, entradas malformadas o intentos de bypass de autorización.

Code review Moderate

Revisión de código: marca cualquier código nuevo que maneje entrada desde esta superficie sin usar los helpers validados del framework.

Auto-corrección de Plexicus

Plexicus detecta automáticamente CWE-1177 y abre un PR de corrección en menos de 60 segundos.

Codex Remedium escanea cada commit, identifica esta debilidad concreta y entrega un pull request listo para revisión con el parche. Sin tickets. Sin traspasos.

Solicitar demo Probar Plexicus gratis
Preguntas frecuentes

Frequently asked questions

¿Qué es 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.

¿Qué gravedad tiene CWE-1177?

MITRE no ha publicado una calificación de probabilidad de explotación para esta debilidad. Trátala como de impacto medio hasta que tu modelo de amenazas demuestre lo contrario.

¿Qué lenguajes o plataformas se ven afectados por CWE-1177?

MITRE no ha especificado plataformas afectadas para esta CWE — puede aplicar a la mayoría de los stacks de aplicaciones.

¿Cómo puedo prevenir 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.

¿Cómo detecta y corrige Plexicus CWE-1177?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-1177 en cada commit. Cuando hay coincidencia, nuestro agente Codex Remedium abre un PR de corrección con el código corregido, las pruebas y un resumen de una línea para el revisor.

¿Dónde puedo aprender más sobre CWE-1177?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/1177.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

Debilidades relacionadas

Weaknesses related to CWE-1177

CWE-710 Padre

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 Hermano

Use of Redundant Code

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

CWE-1044 Hermano

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 Hermano

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 Hermano

Insufficient Technical Documentation

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

CWE-1061 Hermano

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 Hermano

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 Hermano

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 Hermano

Inconsistency Between Implementation and Documented Design

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

Recursos

Further reading

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