Multiple Binds to the Same Port

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

Soyutlama

Variant

Yapı

Simple

Sömürü İhtimali

Medium

Problemi anla

Problem nedir?

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

Genişletilmiş açıklama

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.

Kök neden

Problem nasıl ve ne zaman oluşur?

Yaşam döngüsü evresi

Implementation

Yaşam döngüsü evresi

Operation

Risk

Başarılı sömürü neye yol açar?

Read Application Data

Etkilenen güvenlik alanları: Confidentiality, Integrity

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

Savunma

Nasıl önlenir ve çözülür?

Policy

Policy aşaması savunması

Detay

Restrict server socket address to known local addresses.

Doğrulama

Nasıl tespit edilir?

Automated Static Analysis

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)