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-552 Base Borrador
Files or Directories Accessible to External Parties
This vulnerability occurs when an application exposes files or directories to users who shouldn't have access to them.
Definición
What is CWE-552?
This vulnerability occurs when an application exposes files or directories to users who shouldn't have access to them.
This commonly happens in web servers, FTP servers, or similar systems where files are stored under a publicly accessible root directory. If the application doesn't implement proper access controls, sensitive files placed in or under this directory can be requested and retrieved by unauthorized users. The same risk applies when applications package files into archives (like ZIP or tar files) without first filtering out confidential documents from the included directories.
In modern cloud and container environments, this flaw often appears as misconfigured storage buckets or file shares that are open to public or anonymous access. Managing this at scale is difficult; an ASPM like Plexicus can help you track and remediate these configuration flaws across your entire stack, from code to cloud.
Cómo lo explotan los atacantes
Ruta del atacante paso a paso
- 1
The following Azure command updates the settings for a storage account:
- 2
However, "Allow Blob Public Access" is set to true, meaning that anonymous/public users can access blobs.
- 3
The command could be modified to disable "Allow Blob Public Access" by setting it to false.
- 4
The following Google Cloud Storage command gets the settings for a storage account named 'BUCKET_NAME':
- 5
Suppose the command returns the following result:
Ejemplo de código vulnerable
Vulnerable Shell
The following Azure command updates the settings for a storage account:
az storage account update --name <storage-account> --resource-group <resource-group> --allow-blob-public-access true Ejemplo de código seguro
Secure Shell
The command could be modified to disable "Allow Blob Public Access" by setting it to false.
az storage account update --name <storage-account> --resource-group <resource-group> --allow-blob-public-access false 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-552
- Implementation / System Configuration / Operation When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to disable public access.
Señales de detección
How to detect CWE-552
Plexicus detecta automáticamente CWE-552 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.
Preguntas frecuentes ¿Qué es CWE-552?
¿Qué gravedad tiene CWE-552?
¿Qué lenguajes o plataformas se ven afectados por CWE-552?
¿Cómo puedo prevenir CWE-552?
¿Cómo detecta y corrige Plexicus CWE-552?
¿Dónde puedo aprender más sobre CWE-552?
Frequently asked questions
¿Qué es CWE-552?
This vulnerability occurs when an application exposes files or directories to users who shouldn't have access to them.
¿Qué gravedad tiene CWE-552?
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-552?
MITRE lists the following affected platforms: Not Technology-Specific, Cloud Computing.
¿Cómo puedo prevenir CWE-552?
When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to disable public access.
¿Cómo detecta y corrige Plexicus CWE-552?
El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-552 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-552?
MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/552.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.
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Recursos
Further reading
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