NVD - CVE-2017-7518

CVE-2017-7518 Detail

Current Description

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.

Source: MITRE
Description Last Modified: 07/30/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.8 HIGH
Vector: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (V3 legend)
Impact Score: 5.9
Exploitability Score: 1.8

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 4.6 MEDIUM
Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P) (V2 legend)
Impact Subscore: 6.4
Exploitability Subscore: 3.9

Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
http://www.openwall.com/lists/oss-security/2017/06/23/5	Mailing List Patch Third Party Advisory
http://www.securityfocus.com/bid/99263	Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1038782	Third Party Advisory VDB Entry
https://access.redhat.com/articles/3290921	Permissions Required Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0395	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0412	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518	Issue Tracking Patch Third Party Advisory
https://usn.ubuntu.com/3619-1/	Third Party Advisory
https://usn.ubuntu.com/3619-2/	Third Party Advisory
https://usn.ubuntu.com/3754-1/	Third Party Advisory
https://www.debian.org/security/2017/dsa-3981	Third Party Advisory
https://www.spinics.net/lists/kvm/msg151817.html	Mailing List Patch

Technical Details

Vulnerability Type (View All)

Permissions, Privileges, and Access Control (CWE-264)

Vulnerable software and versions Switch to CPE 2.2

Configuration 1
OR
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
Configuration 2
OR
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Configuration 3
OR
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 4.12

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

3 change records found - show changes

Initial Analysis - 10/10/2018 2:39:46 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::* cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::* cpe:2.3:o:debian:debian_linux:8.0::::::: cpe:2.3:o:debian:debian_linux:9.0:::::::
Added	CPE Configuration		OR cpe:2.3:o:linux:linux_kernel::::::::* versions up to (excluding) 4.12
Added	CPE Configuration		OR cpe:2.3:o:redhat:enterprise_linux:7.0::::::: cpe:2.3:o:redhat:enterprise_linux_desktop:7.0::::::: cpe:2.3:o:redhat:enterprise_linux_server:7.0::::::: cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4::::::: cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4::::::: cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5::::::: cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:::::::
Added	CVSS V2		(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Added	CVSS V3		AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE		CWE-264
Changed	Reference Type	http://www.openwall.com/lists/oss-security/2017/06/23/5 No Types Assigned	http://www.openwall.com/lists/oss-security/2017/06/23/5 Mailing List, Patch, Third Party Advisory
Changed	Reference Type	http://www.securityfocus.com/bid/99263 No Types Assigned	http://www.securityfocus.com/bid/99263 Third Party Advisory, VDB Entry
Changed	Reference Type	http://www.securitytracker.com/id/1038782 No Types Assigned	http://www.securitytracker.com/id/1038782 Third Party Advisory, VDB Entry
Changed	Reference Type	https://access.redhat.com/articles/3290921 No Types Assigned	https://access.redhat.com/articles/3290921 Permissions Required, Third Party Advisory
Changed	Reference Type	https://access.redhat.com/errata/RHSA-2018:0395 No Types Assigned	https://access.redhat.com/errata/RHSA-2018:0395 Third Party Advisory
Changed	Reference Type	https://access.redhat.com/errata/RHSA-2018:0412 No Types Assigned	https://access.redhat.com/errata/RHSA-2018:0412 Third Party Advisory
Changed	Reference Type	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518 No Types Assigned	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518 Issue Tracking, Patch, Third Party Advisory
Changed	Reference Type	https://usn.ubuntu.com/3619-1/ No Types Assigned	https://usn.ubuntu.com/3619-1/ Third Party Advisory
Changed	Reference Type	https://usn.ubuntu.com/3619-2/ No Types Assigned	https://usn.ubuntu.com/3619-2/ Third Party Advisory
Changed	Reference Type	https://usn.ubuntu.com/3754-1/ No Types Assigned	https://usn.ubuntu.com/3754-1/ Third Party Advisory
Changed	Reference Type	https://www.debian.org/security/2017/dsa-3981 No Types Assigned	https://www.debian.org/security/2017/dsa-3981 Third Party Advisory
Changed	Reference Type	https://www.spinics.net/lists/kvm/msg151817.html No Types Assigned	https://www.spinics.net/lists/kvm/msg151817.html Mailing List, Patch

CVE Modified by MITRE - 7/31/2018 9:29:00 PM

Action	Type	New Value
Added	Reference	http://www.securityfocus.com/bid/99263 [No Types Assigned]
Added	Reference	http://www.securitytracker.com/id/1038782 [No Types Assigned]
Added	Reference	https://access.redhat.com/errata/RHSA-2018:0395 [No Types Assigned]
Added	Reference	https://access.redhat.com/errata/RHSA-2018:0412 [No Types Assigned]
Added	Reference	https://usn.ubuntu.com/3619-1/ [No Types Assigned]
Added	Reference	https://usn.ubuntu.com/3619-2/ [No Types Assigned]
Added	Reference	https://www.debian.org/security/2017/dsa-3981 [No Types Assigned]

Quick Info

CVE Dictionary Entry:
CVE-2017-7518
NVD Published Date:
07/30/2018
NVD Last Modified:
10/10/2018

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National Vulnerability Database