Socket Binding To All Interfaces

go.socket_binding_to_all_interfaces

Severity

high

Resource

Access Control

Language

Description

Socket binding to all interfaces occurs when a network service is configured to listen on all available network interfaces, potentially exposing it to unauthorized access.

Rationale

Binding a socket to all interfaces (e.g., using IP address 0.0.0.0) can expose the service to external networks, increasing the risk of unauthorized access or exploitation, particularly if the service is not intended to be publicly accessible.

Here’s an example of socket binding to all interfaces for Golang:

package socket_binding_to_all_interfaces

import (
	"log"
	"net"
)

func main() {
	l, err := net.Listen("tcp", "0.0.0.0:3000") // FLAW
	if err != nil {
		log.Fatal(err)
	}
	defer l.Close()
}

Remediation

To remediate this issue, bind the socket to a specific interface IP address, such as 127.0.0.1 for local-only access, or another appropriate internal network IP.

Here’s how you can implement the remediation:

package socket_binding_to_all_interfaces

import (
	"log"
	"net"
)

func main() {
	l, err := net.Listen("tcp", "127.0.0.1:3000")
	if err != nil {
		log.Fatal(err)
	}
	defer l.Close()
}

References

CWE-200 : Exposure of Sensitive Information to an Unauthorized Actor.