Vulnerability Name:

CVE-2016-3961 (CCN-112233)

Assigned:2016-04-14
Published:2016-04-14
Updated:2016-11-28
Summary:Xen and the Linux kernel through 4.5.x do not properly suppress hugetlbfs support in x86 PV guests, which allows local PV guest OS users to cause a denial of service (guest OS crash) by attempting to access a hugetlbfs mapped area.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
6.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:2.1 Low (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-20
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2016-3961

Source: DEBIAN
Type: UNKNOWN
DSA-3607

Source: BID
Type: UNKNOWN
86068

Source: SECTRACK
Type: Third Party Advisory, VDB Entry
1035569

Source: UBUNTU
Type: Third Party Advisory
USN-3001-1

Source: UBUNTU
Type: Third Party Advisory
USN-3002-1

Source: UBUNTU
Type: Third Party Advisory
USN-3003-1

Source: UBUNTU
Type: Third Party Advisory
USN-3004-1

Source: UBUNTU
Type: Third Party Advisory
USN-3005-1

Source: UBUNTU
Type: Third Party Advisory
USN-3006-1

Source: UBUNTU
Type: Third Party Advisory
USN-3007-1

Source: UBUNTU
Type: UNKNOWN
USN-3049-1

Source: UBUNTU
Type: UNKNOWN
USN-3050-1

Source: CCN
Type: Xen Security Advisory XSA-174
hugetlbfs use may crash PV Linux guests

Source: CONFIRM
Type: Vendor Advisory
http://xenbits.xen.org/xsa/advisory-174.html

Source: CONFIRM
Type: Patch
http://xenbits.xen.org/xsa/xsa174.patch

Source: XF
Type: UNKNOWN
xen-cve20163961-dos(112233)

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2016-3961

Vulnerable Configuration:Configuration 1:
  • cpe:/o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

    • Configuration 2:
  • cpe:/o:xen:xen:*:*:*:*:*:*:*:* (Version <= 4.5.3)

    • Configuration CCN 1:
  • cpe:/a:xensource:xen:4.5:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.cisecurity:def:954
    P
    		DSA-3607-1 -- linux -- security update
    2016-08-12
    oval:com.ubuntu.precise:def:20163961000
    V
    		CVE-2016-3961 on Ubuntu 12.04 LTS (precise) - medium.
    2016-04-15
    oval:com.ubuntu.xenial:def:201639610000000
    V
    		CVE-2016-3961 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-04-15
    oval:com.ubuntu.trusty:def:20163961000
    V
    		CVE-2016-3961 on Ubuntu 14.04 LTS (trusty) - medium.
    2016-04-15
    oval:com.ubuntu.xenial:def:20163961000
    V
    		CVE-2016-3961 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-04-15
    BACK
    canonical ubuntu linux 14.04
    canonical ubuntu linux 15.10
    canonical ubuntu linux 16.04
    xen xen *
    xensource xen 4.5