CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection

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

  Hello,

Quick Emulator(Qemu) built with the Cirrus CLGD 54xx VGA Emulator and the VNC 
display driver support is vulnerable to a heap buffer overflow issue. It could 
occur when Vnc client attempts to update its display after a vga operation is 
performed by a guest.

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

Reference:
----------
  -> https://bugzilla.redhat.com/show_bug.cgi?id=1430056

* 'CVE-2016-9603' has been assigned to this issue by Red Hat Inc.
* Attached herein is a proposed upstream patch to fix this issue.

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

Attachment: 0001-cirrus-vnc-zap-bitblit-support-from-console-code.patch
Description: