CVE-2016-4480

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

The guest_walk_tables function in arch/x86/mm/guest_walk.c in Xen 4.6.x and earlier does not properly handle the Page Size (PS) page table entry bit at the L4 and L3 page table levels, which might allow local guest OS users to gain privileges via a crafted mapping of memory.

References

http://www.debian.org/security/2016/dsa-3633

http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html

http://www.securityfocus.com/bid/90710

http://www.securitytracker.com/id/1035901

http://xenbits.xen.org/xsa/advisory-176.html

Details

Source: MITRE

Published: 2016-05-18

Updated: 2016-12-01

Type: CWE-264

Risk Information

CVSS v2

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3

Base Score: 8.4

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 2.5

Severity: HIGH

Tenable Plugins

View all (14 total)

IDNameProductFamilySeverity
94608SUSE SLES11 Security Update : xen (SUSE-SU-2016:2725-1) (Bunker Buster)NessusSuSE Local Security Checks
critical
94269SUSE SLES12 Security Update : xen (SUSE-SU-2016:2533-1) (Bunker Buster)NessusSuSE Local Security Checks
critical
94267SUSE SLES11 Security Update : xen (SUSE-SU-2016:2528-1) (Bunker Buster)NessusSuSE Local Security Checks
critical
94000openSUSE Security Update : xen (openSUSE-2016-1170) (Bunker Buster)NessusSuSE Local Security Checks
critical
93999openSUSE Security Update : xen (openSUSE-2016-1169) (Bunker Buster)NessusSuSE Local Security Checks
critical
92635Debian DLA-571-1 : xen security update (Bunker Buster)NessusDebian Local Security Checks
high
92614Debian DSA-3633-1 : xen - security update (Bunker Buster)NessusDebian Local Security Checks
high
92602OracleVM 3.2 : xen (OVMSA-2016-0090)NessusOracleVM Local Security Checks
high
92601OracleVM 3.3 : xen (OVMSA-2016-0089)NessusOracleVM Local Security Checks
high
92600OracleVM 3.4 : xen (OVMSA-2016-0088) (Bunker Buster)NessusOracleVM Local Security Checks
high
92127Fedora 22 : xen (2016-8fd9019541)NessusFedora Local Security Checks
high
92101Fedora 24 : xen (2016-5d5a8bfbc5)NessusFedora Local Security Checks
high
92062Fedora 23 : xen (2016-19c82866bb)NessusFedora Local Security Checks
high
91936FreeBSD : xen-kernel -- x86 software guest page walk PS bit handling flaw (e43b210a-4212-11e6-942d-bc5ff45d0f28)NessusFreeBSD Local Security Checks
high