Bug 447759 - (CVE-2008-1952) CVE-2008-1952 qemu/xen/kvm: ioemu: Fix PVFB backend to limit frame buffer size
CVE-2008-1952 qemu/xen/kvm: ioemu: Fix PVFB backend to limit frame buffer size
Status: CLOSED CURRENTRELEASE
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,source=redhat,report...
: Security
Depends On: 447760 447761
Blocks:
  Show dependency treegraph
 
Reported: 2008-05-21 12:55 EDT by Jan Lieskovsky
Modified: 2009-09-11 05:01 EDT (History)
5 users (show)

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Doc Type: Bug Fix
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Last Closed: 2009-09-11 05:01:20 EDT
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Description Jan Lieskovsky 2008-05-21 12:55:10 EDT
Description of problem:

The recent fix to validate the frontend's frame buffer description
neglected to limit the frame buffer size correctly. This lets a
malicious frontend make the backend attempt to map an arbitrary amount
of guest memory, which could be useful for a denial of service attack
against dom0.

Proposed upstream patch:

http://xenbits.xensource.com/xen-unstable.hg?rev/9044705960cb30cec385bdca7305bcf7db096721
Comment 2 Jan Lieskovsky 2008-05-21 13:59:32 EDT
This fix is a sophisticated solution (another catch) for CVE-2008-1943.
Comment 3 Chris Lalancette 2009-09-11 05:01:20 EDT
This is fixed in all the relevant streams, so closing this tracker as CURRENTRELEASE.

Chris Lalancette

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