CVE-2020-8608 QEMU: Slirp: potential OOB access due to unsafe snprintf() usages

[P J P <ppandit () redhat com>]

  Hello,

A out-of-bounds heap buffer access issue was found in the SLiRP networking 
implementation of the QEMU emulator. It occurs in tcp_emu() routine while 
emulating IRC and other protocols due to unsafe usage of snprintf(3) function.

A user/process could use this flaw to crash the Qemu process on the host 
resulting in DoS or potentially execute arbitrary code with privileges of the 
QEMU process on the host.

Upstream patch:
---------------
  -> https://gitlab.freedesktop.org/slirp/libslirp/commit/68ccb8021a838066f0951d4b2817eb6b6f10a843
  -> https://gitlab.freedesktop.org/slirp/libslirp/commit/68ccb8021a838066f0951d4b2817eb6b6f10a843
  -> https://gitlab.freedesktop.org/slirp/libslirp/commit/30648c03b27fb8d9611b723184216cd3174b6775

This issue was reported by Laszlo Ersek(CC'd) and CVE assigned via -> 
https://cveform.mitre.org/

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D