CVE-2020-7039 QEMU: slirp: OOB buffer access while emulating tcp protocols in tcp_emu()

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

  Hello,

A heap buffer overflow issue(s) were found in the SLiRP networking 
implementation of the QEMU emulator. It occurs in tcp_emu() routine while 
emulating IRC and other protocols.

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.

Upstream patch(es):
-------------------
  -> https://gitlab.freedesktop.org/slirp/libslirp/commit/2655fffed7a9e765bcb4701dd876e9dab975f289
  -> https://gitlab.freedesktop.org/slirp/libslirp/commit/ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9
  -> https://gitlab.freedesktop.org/slirp/libslirp/commit/82ebe9c370a0e2970fb5695aa19aa5214a6a1c80

Heap overflow in emulating IRC commands (EMU_IRC) was found and reported by 
Vishnu Dev (CC'd).

'CVE-2020-7039' was assigned via -> https://cveform.mitre.org/

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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