Vulnerability Name:

CVE-2015-2756

Assigned:2015-03-27
Published:2015-04-01
Updated:2017-11-14
Summary: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.
CVSS v3 Severity:6.2 Medium (CCN CVSS v3 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
3.7 Low (Temporal CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
1.6 Low (CCN Temporal CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-264
References:Source: FEDORA
Type: UNKNOWN
FEDORA-2015-5208

Source: FEDORA
Type: UNKNOWN
FEDORA-2015-5402

Source: FEDORA
Type: UNKNOWN
FEDORA-2015-5295

Source: MLIST
Type: UNKNOWN
[Qemu-devel] 20150331 [PATCH][XSA-126] xen: limit guest control of PCI command register

Source: SUSE
Type: UNKNOWN
openSUSE-SU-2015:0732

Source: CONFIRM
Type: UNKNOWN
http://support.citrix.com/article/CTX201145

Source: DEBIAN
Type: UNKNOWN
DSA-3259

Source: BID
Type: UNKNOWN
72577

Source: SECTRACK
Type: UNKNOWN
1031998

Source: UBUNTU
Type: UNKNOWN
USN-2608-1

Source: CONFIRM
Type: VENDOR_ADVISORY
http://xenbits.xen.org/xsa/advisory-126.html

Source: XF
Type: UNKNOWN
xen-cve20152756-dos(101906)

Source: GENTOO
Type: UNKNOWN
GLSA-201504-04

Source: CONFIRM
Type: UNKNOWN
https://support.citrix.com/article/CTX206006

Vulnerable Configuration:Configuration 1:
  • cpe:/o:debian:debian_linux:7.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*

  • Configuration 2:
  • cpe:/o:xen:xen:4.3.0:*:*:*:*:*:*:*
  • OR cpe:/o:xen:xen:4.3.1:*:*:*:*:*:*:*
  • OR cpe:/o:xen:xen:4.3.2:*:*:*:*:*:*:*
  • OR cpe:/o:xen:xen:4.4.0:-:*:*:*:*:*:*
  • OR cpe:/o:xen:xen:4.4.1:-:*:*:*:*:*:*
  • OR cpe:/o:xen:xen:4.5.0:*:*:*:*:*:*:*

  • Configuration 3:
  • cpe:/o:fedoraproject:fedora:20:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:21:*:*:*:*:*:*:*

  • Configuration 4:
  • cpe:/o:canonical:ubuntu_linux:12.04::~~lts~~~:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:14.04::~~lts~~~:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*

  • Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:20152756
    V
    CVE-2015-2756
    2017-11-19
    oval:org.cisecurity:def:47
    P
    DSA-3259-1 -- qemu -- security update
    2016-02-08
    oval:org.mitre.oval:def:29063
    P
    DSA-3259-1 qemu -- qemu
    2015-07-13
    oval:org.mitre.oval:def:28687
    P
    USN-2608-1 -- qemu vulnerabilities
    2015-07-13
    oval:com.ubuntu.precise:def:20152756000
    V
    CVE-2015-2756 on Ubuntu 12.04 LTS (precise) - low.
    2015-04-01
    oval:com.ubuntu.trusty:def:20152756000
    V
    CVE-2015-2756 on Ubuntu 14.04 LTS (trusty) - low.
    2015-04-01
    BACK
    debian debian_linux 7.0
    debian debian_linux 8.0
    xen xen 4.3.0
    xen xen 4.3.1
    xen xen 4.3.2
    xen xen 4.4.0 -
    xen xen 4.4.1 -
    xen xen 4.5.0
    fedoraproject fedora 20
    fedoraproject fedora 21
    canonical ubuntu_linux 12.04
    canonical ubuntu_linux 14.04
    canonical ubuntu_linux 14.10
    canonical ubuntu_linux 15.04