Bug 1289541 - (CVE-2015-8504) CVE-2015-8504 Qemu: ui: vnc: avoid floating point exception
CVE-2015-8504 Qemu: ui: vnc: avoid floating point exception
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20151203,repor...
: Security
Depends On: 1289542 1289544
Blocks: 1267157
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Reported: 2015-12-08 07:09 EST by Prasad J Pandit
Modified: 2018-01-30 18:54 EST (History)
41 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
An arithmetic-exception flaw was found in the QEMU emulator built with VNC display-driver support. The VNC server incorrectly handled 'SetPixelFormat' messages sent from clients. A privileged remote client could use this flaw to crash the guest resulting in denial of service.
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Description Prasad J Pandit 2015-12-08 07:09:07 EST
Qemu emulator built with the VNC display driver support is vulnerable to an
arithmetic exception flaw. It occurs on the VNC server side while processing
the 'SetPixelFormat' messages from a client.

A privileged remote client could use this flaw to crash the guest resulting in
DoS.

Upstream patch:
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  -> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=4c65fed8bdf96780735dbdb92a8

Reference:
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  -> http://www.openwall.com/lists/oss-security/2015/12/08/7
Comment 1 Prasad J Pandit 2015-12-08 07:10:57 EST
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1289544]
Comment 2 Prasad J Pandit 2015-12-08 07:11:20 EST
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1289542]
Comment 3 Prasad J Pandit 2015-12-08 07:32:25 EST
Acknowledgements:

This issue was discovered by Lian Yihan of Qihoo 360 Inc.
Comment 4 Prasad J Pandit 2015-12-08 08:03:13 EST
Statement: 

This issue does not affect the versions of the kvm and xen packages as shipped with Red Hat Enterprise Linux 5.

This issue does not affect the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 6, and the Red Hat Enterprise Linux 6 based versions of qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3.

This issue affects the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 7.

This issue affects the Red Hat Enterprise Linux 7 based versions of the qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3.

This has been rated as having Moderate security impact and is not currently
planned to be addressed in future updates. For additional information, refer
to the Red Hat Enterprise Linux Life Cycle:
https://access.redhat.com/support/policy/updates/errata/.
Comment 8 Fedora Update System 2015-12-14 05:20:51 EST
qemu-2.4.1-3.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 9 Fedora Update System 2015-12-17 02:25:50 EST
xen-4.5.2-5.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 10 Fedora Update System 2015-12-28 18:54:01 EST
qemu-2.3.1-9.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

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