Bug 609202 (CVE-2017-2620)

Summary:	[TRACKER] qemu: display: cirrus_bitblt_cputovideo does not check if memory region is safe
Product:	Gentoo Security	Reporter:	Thomas Deutschmann (RETIRED) <whissi>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal	Keywords:	Tracker
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:	609120, 609206
Bug Blocks:

Description Thomas Deutschmann (RETIRED) gentoo-dev

2017-02-13 02:26:44 UTC

ISSUE DESCRIPTION
=================

In CIRRUS_BLTMODE_MEMSYSSRC mode the bitblit copy routine
cirrus_bitblt_cputovideo fails to check wethehr the specified memory
region is safe.

IMPACT
======

A malicious guest administrator can cause an out of bounds memory
write, very likely exploitable as a privilege escalation.