CWE-605—Multiple Binds to the Same Port

Weakness Name

Multiple Binds to the Same Port

Description

When multiple sockets are allowed to bind to the same port, other services on that port may be stolen or spoofed.

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 with 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.

Common Consequences

Scope:

Confidentiality, Integrity

Impact:

Read Application Data

Notes:

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

Related Weaknesses

• CWE-666Operation on Resource in Wrong Phase of Lifetime
• CWE-675Multiple Operations on Resource in Single-Operation Context