CVE request Qemu: scsi: esp: oob write access while reading ESP command

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

  Hello,

Quick Emulator(Qemu) built with the ESP/NCR53C9x controller emulation support 
is vulnerable to an OOB write access issue. It could occur while doing DMA 
read into ESP command buffer 's->cmdbuf'; It could write past the 's->cmdbuf' 
area, if it was transferring more than 16 bytes in esp_do_dma().

A privileged user inside guest could use this flaw to crash the Qemu process 
resulting in DoS OR potentially leverage it to execute arbitrary code with 
privileges of the Qemu process on the host.

Upstream patches:
-----------------
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=926cde5f3e4d2504ed161ed0
  -> http://git.qemu.org/?p=qemu.git;a=commit;h=cc96677469388bad3d664793

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

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