CVE-2017-7518

MEDIUM

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.

References

http://www.openwall.com/lists/oss-security/2017/06/23/5

http://www.securityfocus.com/bid/99263

http://www.securitytracker.com/id/1038782

https://access.redhat.com/articles/3290921

https://access.redhat.com/errata/RHSA-2018:0395

https://access.redhat.com/errata/RHSA-2018:0412

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518

https://usn.ubuntu.com/3619-1/

https://usn.ubuntu.com/3619-2/

https://usn.ubuntu.com/3754-1/

https://www.debian.org/security/2017/dsa-3981

https://www.spinics.net/lists/kvm/msg151817.html

Details

Source: MITRE

Published: 2018-07-30

Updated: 2019-10-09

Type: CWE-755

Risk Information

CVSS v2.0

Base Score: 4.6

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

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3.0

Base Score: 7.8

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

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH

Vulnerable Software

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:*:*:*:*:*:*:*:*

Tenable Plugins

View all (23 total)

IDNameProductFamilySeverity
130736EulerOS 2.0 SP3 : kernel (EulerOS-SA-2019-2274)NessusHuawei Local Security Checks
critical
127165NewStart CGSL MAIN 5.04 : kernel Multiple Vulnerabilities (NS-SA-2019-0014)NessusNewStart CGSL Local Security Checks
high
124953EulerOS Virtualization 3.0.1.0 : kvm (EulerOS-SA-2019-1450)NessusHuawei Local Security Checks
medium
124834EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1512)NessusHuawei Local Security Checks
high
121997Photon OS 2.0: Linux PHSA-2018-2.0-0101NessusPhotonOS Local Security Checks
high
119423Photon OS 2.0: Linux PHSA-2018-2.0-0101 (deprecated)NessusPhotonOS Local Security Checks
high
112113Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3754-1)NessusUbuntu Local Security Checks
high
109158OracleVM 3.4 : Unbreakable / etc (OVMSA-2018-0035) (Dirty COW) (Meltdown) (Spectre)NessusOracleVM Local Security Checks
high
109156Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4071) (Dirty COW) (Meltdown) (Spectre)NessusOracle Linux Local Security Checks
high
109114OracleVM 3.4 : Unbreakable / etc (OVMSA-2018-0033)NessusOracleVM Local Security Checks
high
109008Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4062)NessusOracle Linux Local Security Checks
high
108878Ubuntu 14.04 LTS : linux-lts-xenial, linux-aws vulnerabilities (USN-3619-2)NessusUbuntu Local Security Checks
high
108842Ubuntu 16.04 LTS : linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities (USN-3619-1)NessusUbuntu Local Security Checks
high
107271CentOS 7 : kernel (CESA-2018:0395)NessusCentOS Local Security Checks
medium
107210Scientific Linux Security Update : kernel on SL7.x x86_64 (20180306)NessusScientific Linux Local Security Checks
medium
107203Oracle Linux 7 : kernel (ELSA-2018-0395)NessusOracle Linux Local Security Checks
medium
107189RHEL 7 : kernel-rt (RHSA-2018:0412)NessusRed Hat Local Security Checks
medium
107186RHEL 7 : kernel (RHSA-2018:0395)NessusRed Hat Local Security Checks
medium
104374SUSE SLES12 Security Update : kernel (SUSE-SU-2017:2920-1) (KRACK) (Stack Clash)NessusSuSE Local Security Checks
critical
104271SUSE SLES12 Security Update : kernel (SUSE-SU-2017:2908-1) (KRACK) (Stack Clash)NessusSuSE Local Security Checks
critical
104253SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2017:2869-1) (KRACK)NessusSuSE Local Security Checks
high
103365Debian DSA-3981-1 : linux - security update (BlueBorne) (Stack Clash)NessusDebian Local Security Checks
high
101348openSUSE Security Update : the Linux Kernel (openSUSE-2017-798) (Stack Clash)NessusSuSE Local Security Checks
high