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CVE-2016-4441 Qemu: scsi: esp: OOB write while writing to 's-cmdbuf' in get_cmd

From: P J P <ppandit () redhat com>
Date: Thu, 19 May 2016 16:46:52 +0530 (IST)

  Hello,

Quick Emulator(Qemu) built with the ESP/NCR53C9x controller emulation support
is vulnerable to an OOB write access issue. The controller uses 16-byte FIFO
buffer for command and data transfer. The OOB write occurs while writing to
this command buffer in routine get_cmd().

A privileged user inside guest could use this flaw to crash the Qemu process
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg03274.html

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1337505

This issue was discovered by Li Qiang of 360.cn Inc.

'CVE-2016-4441' has been assigned by Red Hat Inc.

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

Current thread:

CVE-2016-4441 Qemu: scsi: esp: OOB write while writing to 's-cmdbuf' in get_cmd P J P (May 19)