CWE-605: Multiple Binds to the Same Port

MITRE CWE weakness

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

• Confidentiality, Integrity: Read Application Data

Mitigations

Policy — Restrict server socket address to known local addresses.

References

• CWE page: https://cwe.mitre.org/data/definitions/605.html
• CWE list: https://cwe.mitre.org/data/index.html