Vulnerability CVE-2015-2756
Published: 2015-04-01

Description:
QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.

Type:

CWE-264

 (Permissions, Privileges, and Access Controls)

CVSS2 => (AV:L/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.9/10
6.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
XEN -> XEN 
Fedoraproject -> Fedora 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154574.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154579.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155198.html
http://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg06179.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html
http://support.citrix.com/article/CTX201145
http://www.debian.org/security/2015/dsa-3259
http://www.securityfocus.com/bid/72577
http://www.securitytracker.com/id/1031998
http://www.ubuntu.com/usn/USN-2608-1
http://xenbits.xen.org/xsa/advisory-126.html
https://security.gentoo.org/glsa/201504-04
https://support.citrix.com/article/CTX206006
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