CWE-1327 Base Incomplete

Binding to an Unrestricted IP Address

This vulnerability occurs when software or a service is configured to bind to the IP address 0.0.0.0 (or :: in IPv6), which acts as a wildcard, accepting connections from any network interface on…

Definition

What is CWE-1327?

This vulnerability occurs when software or a service is configured to bind to the IP address 0.0.0.0 (or :: in IPv6), which acts as a wildcard, accepting connections from any network interface on the host system.

Binding to 0.0.0.0 tells the server to listen for connections on all available network interfaces—including public, private, and localhost addresses. While this is sometimes necessary for development or specific services, it often unintentionally exposes the service to networks it shouldn't be accessible from, like the public internet, when only a specific internal or management network was intended. This creates a significant security gap by bypassing network segmentation and firewall controls. An attacker who can reach any of the host's interfaces can potentially connect to the service. Developers should explicitly bind to specific, intended IP addresses (like 127.0.0.1 for local-only or a specific internal IP) to enforce the principle of least privilege and reduce the system's attack surface.

Auswirkungen in der Praxis

Real-world CVEs caused by CWE-1327

CVE-2022-21947

Desktop manager for Kubernetes and container management binds a service to 0.0.0.0, allowing users on the network to make requests to a dashboard API.

Wie Angreifer es ausnutzen

Angreiferpfad Schritt für Schritt

1
Identifiziere einen Codepfad, der nicht vertrauenswürdige Eingaben ohne Validierung verarbeitet.
2
Erzeuge eine Payload, die das unsichere Verhalten auslöst — Injection, Traversal, Overflow oder Logik-Missbrauch.
3
Liefere die Payload über einen normalen Request aus und beobachte die Reaktion der Anwendung.
4
Iteriere, bis die Antwort Daten preisgibt, Angreifer-Code ausführt oder Berechtigungen eskaliert.

Verwundbares Codebeispiel

Vulnerable Other

The following code snippet uses 0.0.0.0 in a Puppet script.

Verwundbar Other

signingserver::instance {

```
   "nightly-key-signing-server": 
  	 listenaddr => "0.0.0.0",
  	 port => "9100",
  	 code_tag => "SIGNING_SERVER",
   }

Sicheres Codebeispiel

Secure Other

The Puppet code snippet is used to provision a signing server that will use 0.0.0.0 to accept traffic. However, as 0.0.0.0 is unrestricted, malicious users may use this IP address to launch frequent requests and cause denial of service attacks.

Sicher Other

signingserver::instance {

```
   "nightly-key-signing-server": 
  	 listenaddr => "127.0.0.1",
  	 port => "9100",
  	 code_tag => "SIGNING_SERVER",
   }

What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.

Präventions-Checkliste

How to prevent CWE-1327

System Configuration Assign IP addresses that are not 0.0.0.0.
System Configuration Unwanted connections to the configured server may be denied through a firewall or other packet filtering measures.

Erkennungssignale

How to detect CWE-1327

SAST High

Führe statische Analyse (SAST) auf der Codebasis aus und suche im Datenfluss nach dem unsicheren Muster.

DAST Moderate

Führe dynamische Application-Security-Tests gegen den Live-Endpoint aus.

Runtime Moderate

Beobachte Runtime-Logs auf ungewöhnliche Exception-Traces, fehlerhafte Eingaben oder Versuche, Autorisierung zu umgehen.

Code review Moderate

Code Review: Markiere jeden neuen Code, der Eingaben von dieser Oberfläche ohne validierte Framework-Helper verarbeitet.

Plexicus Auto-Fix

Plexicus erkennt CWE-1327 automatisch und öffnet in unter 60 Sekunden einen Fix-PR.

Codex Remedium scannt jeden Commit, identifiziert genau diese Schwachstelle und liefert einen reviewer-ready Pull Request mit dem Patch. Keine Tickets. Keine Hand-offs.

Demo anfordern Plexicus kostenlos testen

Häufig gestellte Fragen

Frequently asked questions

Was ist CWE-1327?

Wie gravierend ist CWE-1327?

MITRE hat für diese Schwachstelle keine Exploit-Wahrscheinlichkeit veröffentlicht. Behandle sie als mittlere Auswirkung, bis dein Threat Model anderes belegt.

Welche Sprachen oder Plattformen sind von CWE-1327 betroffen?

MITRE lists the following affected platforms: Other, Not OS-Specific, Not Architecture-Specific, Web Server, Client Server, Cloud Computing.

Wie kann ich CWE-1327 verhindern?

Assign IP addresses that are not 0.0.0.0. Unwanted connections to the configured server may be denied through a firewall or other packet filtering measures.

Wie erkennt und behebt Plexicus CWE-1327?

Die SAST-Engine von Plexicus erkennt die Datenfluss-Signatur von CWE-1327 bei jedem Commit. Bei einem Treffer öffnet unser Codex-Remedium-Agent einen Fix-PR mit korrigiertem Code, Tests und einer einzeiligen Zusammenfassung für den Reviewer.

Wo erfahre ich mehr über CWE-1327?

MITRE veröffentlicht die kanonische Definition unter https://cwe.mitre.org/data/definitions/1327.html. Für ergänzende Hinweise kannst du auch die OWASP- und NIST-Dokumentation heranziehen.

Verwandte Schwachstellen

Weaknesses related to CWE-1327

CWE-668 Parent

Exposure of Resource to Wrong Sphere

This vulnerability occurs when an application unintentionally makes a resource accessible to users or systems that should not have…

CWE-1189 Sibling

Improper Isolation of Shared Resources on System-on-a-Chip (SoC)

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CWE-1282 Sibling

Assumed-Immutable Data is Stored in Writable Memory

This vulnerability occurs when data that should be permanent and unchangeable—like a bootloader, device IDs, or one-time configuration…

CWE-1331 Sibling

Improper Isolation of Shared Resources in Network On Chip (NoC)

This vulnerability occurs when a Network on Chip (NoC) fails to properly separate its internal, shared resources—like buffers, switches,…

CWE-134 Sibling

Use of Externally-Controlled Format String

This vulnerability occurs when a program uses a format string from an untrusted, external source (like user input, a network packet, or a…

CWE-200 Sibling

Exposure of Sensitive Information to an Unauthorized Actor

This weakness occurs when an application unintentionally reveals sensitive data to someone who shouldn't have access to it.

CWE-374 Sibling

Passing Mutable Objects to an Untrusted Method

This vulnerability occurs when a function receives a direct reference to mutable data, such as an object or array, instead of a safe copy…

CWE-375 Sibling

Returning a Mutable Object to an Untrusted Caller

This vulnerability occurs when a method directly returns a reference to its internal mutable data, allowing untrusted calling code to…

CWE-377 Sibling

Insecure Temporary File

This vulnerability occurs when an application creates temporary files with insecure permissions or in predictable locations, allowing…

Ressourcen

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