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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 <whissi>
Component: VulnerabilitiesAssignee: 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 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.