National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

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)

Change History

3 change records found - show changes

Quick Info

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