Multiple Binds to the Same Port

Opis

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.

Skutki

• Confidentiality, Integrity

  Read Application Data

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

Zapobieganie

• Policy

  Restrict server socket address to known local addresses.

Słabość nadrzędna

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

Kiedy powstaje

• Implementation
• Operation

Dotyczy

Not Language-Specific