id = 1593
title = "SLIRP hostfwd ignores bind address and uses `INADDR_ANY`"
state = "closed"
created_at = "2023-04-12T03:35:09.563Z"
closed_at = "2023-04-14T08:20:43.990Z"
labels = ["workflow::Needs Info"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1593"
host-os = "macOS"
host-arch = "ARM64"
qemu-version = "7.2.1"
guest-os = "Alpine Linux"
guest-arch = "ARM64"
description = """When using `-netdev hostfwd=`..., qemu SLIRP uses `INADDR_ANY` instead of any bind address provided by the user. As a result, even if the user specifies to listen only on localhost (e.g. `-netdev user,hostfwd=tcp:127.0.0.1:22-:22`), qemu will listen on `*.*`. This is a potential security issue (as it may unexpectedly expose the guest to internet or local network traffic)."""
reproduce = "n/a"
additional = """The bug is here: https://gitlab.com/qemu-project/qemu/-/blob/master/net/slirp.c#L777

Rather than hardcoding `INADDR_ANY`, qemu should respect the user-defined bind address."""