CVE-2019-14378 QEMU: slirp: heap buffer overflow during packet reassembly

[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 ip_reass() routine while reassembling 
incoming packets, if the first fragment is bigger than the m->m_dat[] 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://gitlab.freedesktop.org/slirp/libslirp/commit/126c04acbabd7ad32c2b018fe10dfac2a3bc1210

This issue was reported by Vishnu Dev(CC'd).

CVE requested via -> https://cveform.mitre.org/

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