Multiple Binds to the Same Port
Weakness ID: 605 (Weakness Base)Status: Draft
+ Description

Description Summary

When multiple sockets are allowed to bind to the same port, other services on that port may be stolen or spoofed.
+ Time of Introduction
  • Architecture and Design
  • Implementation
  • Operation
+ Applicable Platforms



+ Common Consequences

Packets from a variety of network services may be stolen or the services spoofed.

+ Demonstrative Examples

Example 1

Example Language:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <stdio.h>
#include <arpa/inet.h>

void bind_socket(void) {
int server_sockfd;
int server_len;
struct sockaddr_in server_address;
server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
server_address.sin_family = AF_INET;
server_address.sin_port = 21;
server_address.sin_addr.s_addr = htonl(INADDR_ANY);
server_len = sizeof(struct sockaddr_in);
bind(server_sockfd, (struct sockaddr *) &s1, server_len);
+ Potential Mitigations

Restrict server socket address to known local addresses.

+ Other Notes

On most systems, a combination of setting the SO_REUSEADDR socket option, and a call to bind() allows any process to bind to a port to which a previous process has bound width INADDR_ANY. This allows a user to bind to the specific address of a server bound to INADDR_ANY on an unprivileged port, and steal its udp packets/tcp connection.

+ Relationships
NatureTypeIDNameView(s) this relationship pertains toView(s)
ChildOfWeakness ClassWeakness Class227Failure to Fulfill API Contract ('API Abuse')
Development Concepts (primary)699
ChildOfWeakness BaseWeakness Base666Operation on Resource in Wrong Phase of Lifetime
Research Concepts1000
ChildOfWeakness ClassWeakness Class675Duplicate Operations on Resource
Research Concepts (primary)1000
+ Content History
Submission DateSubmitterOrganizationSource
Anonymous Tool Vendor (under NDA)Externally Mined
Modification DateModifierOrganizationSource
2008-07-01Eric DalciCigitalExternal
updated Time of Introduction
2008-09-08CWE Content TeamMITREInternal
updated Common Consequences, Relationships, Other Notes, Taxonomy Mappings
2009-05-27CWE Content TeamMITREInternal
updated Demonstrative Examples
2009-10-29CWE Content TeamMITREInternal
updated Common Consequences
Previous Entry Names
Change DatePrevious Entry Name
2008-04-11Multiple Binds to Same Port