CVE-2019-6778 QEMU: slirp: heap buffer overflow in tcp_emu()

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

  Hello,

A heap buffer overflow issue was found in the SLiRP networking implementation 
of the QEMU emulator. It occurs in tcp_emu() routine while emulating 
Identification protocol and copying message data to a socket buffer.

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:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg03132.html

This issue was reported by Kira from Tencent Keen Security Lab.

CVE-2019-6778 assigned via -> http://cveform.mitre.org/

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