Vulnerability Name:

CVE-2016-3157 (CCN-111520)

Assigned:2016-03-16
Published:2016-03-16
Updated:2016-12-03
Summary:The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.
CVSS v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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): High
Integrity (I): High
Availibility (A): High
6.6 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H)
5.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/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): Low
Integrity (I): Low
Availibility (A): High
CVSS v2 Severity:7.2 High (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
5.7 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:P/I:P/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Complete
Vulnerability Type:CWE-264
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2016-3157

Source: DEBIAN
Type: UNKNOWN
DSA-3607

Source: CONFIRM
Type: UNKNOWN
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

Source: BID
Type: UNKNOWN
84594

Source: SECTRACK
Type: UNKNOWN
1035308

Source: UBUNTU
Type: UNKNOWN
USN-2968-1

Source: UBUNTU
Type: UNKNOWN
USN-2968-2

Source: UBUNTU
Type: UNKNOWN
USN-2969-1

Source: UBUNTU
Type: UNKNOWN
USN-2970-1

Source: UBUNTU
Type: UNKNOWN
USN-2971-1

Source: UBUNTU
Type: UNKNOWN
USN-2971-2

Source: UBUNTU
Type: UNKNOWN
USN-2971-3

Source: UBUNTU
Type: UNKNOWN
USN-2996-1

Source: UBUNTU
Type: UNKNOWN
USN-2997-1

Source: CCN
Type: Xen Security Advisory XSA-171
I/O port access privilege escalation in x86-64 Linux

Source: CONFIRM
Type: Patch, Vendor Advisory
http://xenbits.xen.org/xsa/advisory-171.html

Source: XF
Type: UNKNOWN
xen-cve20163157-priv-esc(111520)

Vulnerable Configuration:Configuration 1:
  • cpe:/o:xen:xen:4.0.0:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*

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

    • * 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:20163157000
    V
    		CVE-2016-3157 on Ubuntu 12.04 LTS (precise) - medium.
    2016-04-12
    oval:com.ubuntu.xenial:def:201631570000000
    V
    		CVE-2016-3157 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-04-12
    oval:com.ubuntu.trusty:def:20163157000
    V
    		CVE-2016-3157 on Ubuntu 14.04 LTS (trusty) - medium.
    2016-04-12
    oval:com.ubuntu.xenial:def:20163157000
    V
    		CVE-2016-3157 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-04-12
    BACK
    xen xen 4.0.0
    canonical ubuntu linux 12.04
    xensource xen *