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Fencer Vulns
medium 4.7

CVE-2018-5407 json

Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel…

published 2018-11-15 7 y ago modified 2026-10-08 31 d ago also EUVD-2018-17177

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
1
Exploit-DB

Summary

Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'.

Patch / fix

  • nodejs node.js 6.14.4, 8.11.4, 10.9.0
  • openssl openssl 1.0.2q, 1.1.0i
  • tenable nessus 8.1.1
  • oracle vm_virtualbox 6.0.0
  • openssl Debian 14, Debian 13, Debian 12 1.1.1~~pre9-1

debian advisories DEBIAN-CVE-2018-5407

  • openssl Ubuntu 14.04 LTS 1.0.1f-1ubuntu2.27
  • openssl Ubuntu 16.04 LTS 1.0.2g-1ubuntu4.14
  • openssl Ubuntu 18.04 LTS 1.1.0g-2ubuntu4.3
  • openssl1.0 Ubuntu 18.04 LTS 1.0.2n-1ubuntu5.2

ubuntu advisories UBUNTU-CVE-2018-5407

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jbcs-httpd24-apr jboss core services 1 1.6.3-63.jbcs.el6
  • jbcs-httpd24-curl jboss core services 1 7.64.1-14.jbcs.el6
  • jbcs-httpd24-httpd jboss core services 1 2.4.37-33.jbcs.el6
  • jbcs-httpd24-brotli jboss core services 1 1.0.6-7.jbcs.el6
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.46-22.redhat_1.jbcs.el6
  • jbcs-httpd24-mod_md jboss core services 1 2.4.37-33.jbcs.el6
  • jbcs-httpd24-jansson jboss core services 1 2.11-20.jbcs.el6
  • jbcs-httpd24-libcurl jboss core services 1 7.64.1-14.jbcs.el6

red hat advisories RHSA-2019:3932RHSA-2019:3933RHSA-2019:3929RHSA-2019:0483RHSA-2019:2125RHBA-2019:1088

  • nodejs6 SLE Module for Web and Scripting 12, OpenStack Cloud Crowbar 8, OpenStack Cloud 7 +1 more 6.16.0-11.21.1
  • nodejs4 SLE Module for Web and Scripting 12, Enterprise Storage 4 4.9.1-15.17.1
  • openssl Studio Onsite 1.3, SLES for SAP 11 SP4, SLES 11 SP4 +4 more 0.9.8j-0.106.18.1
  • compat-openssl098 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +4 more 0.9.8j-106.9.1
  • openssl-1_0_0 SLE Module for Legacy 15 1.0.2p-3.11.1
  • openssl-1_0_0 SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 1.0.2p-3.3.1
  • openssl1 SLES 11-SECURITY 1.0.1g-0.58.15.1
  • openssl SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES 12 SP3 +6 more 1.0.2j-60.46.1

suse advisories SUSE-SU-2019:1553-1SUSE-SU-2018:3864-2SUSE-SU-2019:0395-1SUSE-SU-2019:0117-1SUSE-SU-2018:4274-1SUSE-SU-2018:4068-1

  • openssl-1_0_0 openSUSE Tumbleweed 1.0.2u-6.2

opensuse advisories openSUSE-SU-2024:11126-1

  • openssl Alpine 3.8, Alpine 3.7, Alpine 3.6 +3 more 1.0.2q-r0

alpine advisories ALPINE-CVE-2018-5407

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-5407 updated cvss 4.8

openssl: Side-channel vulnerability on SMT/Hyper-Threading architectures (PortSmash)

  • Red Hat Enterprise Linux 5 openssl, openssl097a Red Hat Enterprise Linux 6 openssl, openssl098e, openssl-perl Red Hat Enterprise Linux 7 openssl098e Red Hat Enterprise Linux 8 compat-openssl10 Red Hat JBoss Enterprise Application Platform 5 openssl Red Hat JBoss Enterprise Application Platform 6 openssl
    +2 more products
    Red Hat JBoss Enterprise Web Server 2 openssl Red Hat JBoss Web Server 3 openssl
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux Client Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux ComputeNode (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1
    +4 more products
    Red Hat Enterprise Linux Server (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1, ovmf 20180508-6.gitee3198e672e2.el7, OVMF 20180508-6.gitee3198e672e2.el7 Red Hat Enterprise Linux Server Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux Workstation (v. 7) openssl 1.0.2k-16.el7_6.1, openssl-libs 1.0.2k-16.el7_6.1 Red Hat Enterprise Linux Workstation Optional (v. 7) openssl-perl 1.0.2k-16.el7_6.1
    fixed: vendor fix RHSA-2019:0483
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2019:3935
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el6, jbcs-httpd24-brotli 1.0.6-7.jbcs.el6, jbcs-httpd24-curl 7.64.1-14.jbcs.el6, jbcs-httpd24-httpd 2.4.37-33.jbcs.el6, jbcs-httpd24-jansson 2.11-20.jbcs.el6, jbcs-httpd24-mod_md 2.4.37-33.jbcs.el6, +25 more
    fixed: vendor fix RHSA-2019:3932
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el7, jbcs-httpd24-brotli 1.0.6-7.jbcs.el7, jbcs-httpd24-curl 7.64.1-14.jbcs.el7, jbcs-httpd24-httpd 2.4.37-33.jbcs.el7, jbcs-httpd24-jansson 2.11-20.jbcs.el7, jbcs-httpd24-mod_md 2.4.37-33.jbcs.el7, +25 more
    fixed: vendor fix RHSA-2019:3933
  • Red Hat JBoss Web Server 5
    fixed: vendor fix RHSA-2019:3931
  • Red Hat JBoss Web Server 5.2 for RHEL 6 Server jws5-ecj 4.12.0-1.redhat_1.1.el6jws, jws5-tomcat 9.0.21-10.redhat_4.1.el6jws, jws5-tomcat-lib 9.0.21-10.redhat_4.1.el6jws, jws5-javapackages-tools 3.4.1-5.15.11.el6jws, jws5-python-javapackages 3.4.1-5.15.11.el6jws, jws5-tomcat-native 1.2.21-34.redhat_34.el6jws, +13 more Red Hat JBoss Web Server 5.2 for RHEL 7 Server jws5-ecj 4.12.0-1.redhat_1.1.el7jws, jws5-tomcat 9.0.21-10.redhat_4.1.el7jws, jws5-tomcat-lib 9.0.21-10.redhat_4.1.el7jws, jws5-javapackages-tools 3.4.1-5.15.11.el7jws, jws5-python-javapackages 3.4.1-5.15.11.el7jws, jws5-tomcat-native 1.2.21-34.redhat_34.el7jws, +13 more Red Hat JBoss Web Server 5.2 for RHEL 8 jws5-ecj 4.12.0-1.redhat_1.1.el8jws, jws5-tomcat 9.0.21-10.redhat_4.1.el8jws, jws5-tomcat-lib 9.0.21-10.redhat_4.1.el8jws, jws5-javapackages-tools 3.4.1-5.15.11.el8jws, jws5-python-javapackages 3.4.1-5.15.11.el8jws, jws5-tomcat-native 1.2.21-34.redhat_34.el8jws, +13 more
    fixed: vendor fix RHSA-2019:3929
  • Red Hat Virtualization 4 Hypervisor for RHEL 7 rhvm-appliance 4.3-20190409.0.el7, redhat-virtualization-host 4.3-20190409.0.el7_6, redhat-virtualization-host-image-update 4.3-20190409.0.el7_6 Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts rhvm-appliance 4.3-20190409.0.el7
    fixed: vendor fix RHBA-2019:1088
show 2 more
  • Red Hat RHEL 7-based RHEV-H for RHEV 4 (build requirements) imgbased 1.1.7-0.1.el7ev, python-imgbased 1.1.7-0.1.el7ev, ovirt-node-ng 4.3.0-0.20181213.0.el7ev, ovirt-node-ng-nodectl 4.3.0-0.20181213.0.el7ev, redhat-release-virtualization-host 4.3-0.5.el7, python2-ovirt-node-ng-nodectl 4.3.0-0.20181213.0.el7ev, +1 more
    fixed: vendor fix RHBA-2019:1053
  • Red Hat Enterprise Linux 8 openssl, openssl-libs, openssl-perl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-45785)
  2. Published

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
31 d ago

Exploit prediction

3.42% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-45785 Intel (Skylake / Kaby Lake) - 'PortSmash' CPU SMT Side-Channel local, 2018-11-02
  • github.com https://github.com/bbbrumley/portsmash referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • N/A Processors supporting Simultaneous Multi-Threading

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-203 Observable Discrepancy
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.