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Description of problem:

Upstream libslirp has disabled emulation of the tcp programs like ftp/IRC etc. in user-mode SLiRP networking since v4.1.0.

 ->  https://gitlab.freedesktop.org/slirp/libslirp/commit/07c2a44b67e219ac14207f7a1b33704e1312cf91

   emu: disable by default

tcp_emu() is known to have caused several CVEs, and not useful today in most cases.

https://nvd.nist.gov/vuln/detail/CVE-2019-6778
https://nvd.nist.gov/vuln/detail/CVE-2019-9824

The feature can be still enabled by setting SlirpConfig.enable_emu to
true.

* Please include this patch in the qemu-kvm package versions of RHEL too.

* It'll probably be better to disable user-mode SLiRP networking itself in qemu-kvm.

  ie. compile qemu-kvm package with '--disable-slirp' configure option.

The patch fixing this BZ is lacking review ACKs.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1587